diff --git a/lib/braintrust/api.rb b/lib/braintrust/api.rb
index 824c362..a556dea 100644
--- a/lib/braintrust/api.rb
+++ b/lib/braintrust/api.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require_relative "api/datasets"
+require_relative "api/experiments"
 require_relative "api/functions"
 
 module Braintrust
@@ -20,6 +21,12 @@ def datasets
       @datasets ||= API::Datasets.new(self)
     end
 
+    # Access to experiments API
+    # @return [API::Experiments]
+    def experiments
+      @experiments ||= API::Experiments.new(self)
+    end
+
     # Access to functions API
     # @return [API::Functions]
     def functions
diff --git a/lib/braintrust/api/experiments.rb b/lib/braintrust/api/experiments.rb
new file mode 100644
index 0000000..2028c05
--- /dev/null
+++ b/lib/braintrust/api/experiments.rb
@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+require "net/http"
+require "json"
+require "uri"
+require_relative "../logger"
+
+module Braintrust
+  class API
+    # Experiments API namespace
+    # Provides methods for fetching experiment comparison data
+    class Experiments
+      def initialize(api)
+        @api = api
+        @state = api.state
+      end
+
+      # Fetch experiment comparison data
+      # GET /experiment-comparison2
+      # Returns score and metric summaries with comparison to baseline experiment
+      # @param experiment_id [String] Current experiment ID
+      # @param base_experiment_id [String, nil] Baseline experiment ID to compare against.
+      #   If nil, API will auto-select based on experiment metadata or most recent experiment.
+      # @return [Hash] Response with scores, metrics, and comparison info
+      #   - "scores" [Hash] Score summaries keyed by name
+      #   - "metrics" [Hash] Metric summaries keyed by name
+      #   - "comparisonExperimentName" [String, nil] Name of baseline experiment
+      #   - "comparisonExperimentId" [String, nil] ID of baseline experiment
+      def comparison(experiment_id:, base_experiment_id: nil)
+        params = {"experiment_id" => experiment_id}
+        params["base_experiment_id"] = base_experiment_id if base_experiment_id
+
+        http_get("/experiment-comparison2", params)
+      end
+
+      private
+
+      # Core HTTP request method with logging
+      # @param method [Symbol] :get or :post
+      # @param path [String] API path
+      # @param params [Hash] Query params (for GET)
+      # @param payload [Hash, nil] JSON payload (for POST)
+      # @return [Hash] Parsed JSON response
+      def http_request(method, path, params: {}, payload: nil)
+        # Build URI - use api_url for this endpoint
+        base = @state.api_url || "https://api.braintrust.dev"
+        uri = URI("#{base}#{path}")
+        uri.query = URI.encode_www_form(params) unless params.empty?
+
+        # Create request
+        request = case method
+        when :get
+          Net::HTTP::Get.new(uri)
+        when :post
+          req = Net::HTTP::Post.new(uri)
+          req["Content-Type"] = "application/json"
+          req.body = JSON.dump(payload) if payload
+          req
+        else
+          raise ArgumentError, "Unsupported HTTP method: #{method}"
+        end
+
+        # Use Bearer token format for API endpoints
+        request["Authorization"] = "Bearer #{@state.api_key}"
+
+        # Execute request with timing
+        start_time = Time.now
+        Log.debug("[API] #{method.upcase} #{uri}")
+
+        http = Net::HTTP.new(uri.host, uri.port)
+        http.use_ssl = (uri.scheme == "https")
+        response = http.request(request)
+
+        duration_ms = ((Time.now - start_time) * 1000).round(2)
+        Log.debug("[API] #{method.upcase} #{uri} -> #{response.code} (#{duration_ms}ms, #{response.body.bytesize} bytes)")
+
+        # Handle response
+        unless response.is_a?(Net::HTTPSuccess)
+          Log.debug("[API] Error response body: #{response.body}")
+          raise Error, "HTTP #{response.code} for #{method.upcase} #{uri}: #{response.body}"
+        end
+
+        JSON.parse(response.body)
+      end
+
+      # HTTP GET with query params - returns parsed JSON
+      def http_get(path, params = {})
+        http_request(:get, path, params: params)
+      end
+    end
+  end
+end
diff --git a/lib/braintrust/eval.rb b/lib/braintrust/eval.rb
index cc14076..1edbb5c 100644
--- a/lib/braintrust/eval.rb
+++ b/lib/braintrust/eval.rb
@@ -2,6 +2,8 @@
 
 require_relative "eval/scorer"
 require_relative "eval/runner"
+require_relative "eval/summary"
+require_relative "eval/result"
 require_relative "internal/experiments"
 
 require "opentelemetry/sdk"
@@ -199,13 +201,15 @@ def scorer(name, callable = nil, &block)
       # @param metadata [Hash] Optional experiment metadata
       # @param update [Boolean] If true, allow reusing existing experiment (default: false)
       # @param quiet [Boolean] If true, suppress result output (default: false)
+      # @param send_logs [Boolean] If true (default), create experiment on server and send span data.
+      #   If false, run evaluation locally without sending data to Braintrust.
       # @param state [State, nil] Braintrust state (defaults to global state)
       # @param tracer_provider [TracerProvider, nil] OpenTelemetry tracer provider (defaults to global)
       # @return [Result]
       def run(project:, experiment:, task:, scorers:,
         cases: nil, dataset: nil,
         parallelism: 1, tags: nil, metadata: nil, update: false, quiet: false,
-        state: nil, tracer_provider: nil)
+        send_logs: true, state: nil, tracer_provider: nil)
         # Validate required parameters
         validate_params!(project: project, experiment: experiment,
           cases: cases, dataset: dataset, task: task, scorers: scorers)
@@ -223,17 +227,48 @@ def run(project:, experiment:, task:, scorers:,
           cases = resolve_dataset(dataset, project, state)
         end
 
+        if send_logs
+          run_with_server(
+            project: project, experiment: experiment, task: task, scorers: scorers,
+            cases: cases, parallelism: parallelism, tags: tags, metadata: metadata,
+            update: update, quiet: quiet, state: state, tracer_provider: tracer_provider
+          )
+        else
+          run_local(
+            project: project, experiment: experiment, task: task, scorers: scorers,
+            cases: cases, parallelism: parallelism, quiet: quiet, state: state
+          )
+        end
+      end
+
+      private
+
+      # Print result summary to stdout
+      # @param result [Result] The evaluation result
+      def print_result(result)
+        puts result.to_pretty
+      end
+
+      # Run evaluation with server integration (send_logs: true)
+      # Creates experiment, sends span data, fetches comparison summary
+      def run_with_server(project:, experiment:, task:, scorers:, cases:,
+        parallelism:, tags:, metadata:, update:, quiet:, state:, tracer_provider:)
+        require_relative "api"
+
         # Register project and experiment via API
-        result = Internal::Experiments.get_or_create(
+        reg_result = Internal::Experiments.get_or_create(
           experiment, project, state: state,
           tags: tags, metadata: metadata, update: update
         )
 
-        experiment_id = result[:experiment_id]
-        project_id = result[:project_id]
-        project_name = result[:project_name]
+        experiment_id = reg_result[:experiment_id]
+        project_id = reg_result[:project_id]
+        project_name = reg_result[:project_name]
+
+        # Generate permalink
+        permalink = "#{state.app_url}/app/#{state.org_name}/object?object_type=experiment&object_id=#{experiment_id}"
 
-        # Instantiate Runner and run evaluation
+        # Instantiate Runner and run evaluation with tracing
         runner = Runner.new(
           experiment_id: experiment_id,
           experiment_name: experiment,
@@ -244,20 +279,166 @@ def run(project:, experiment:, task:, scorers:,
           state: state,
           tracer_provider: tracer_provider
         )
-        result = runner.run(cases, parallelism: parallelism)
 
-        # Print result summary unless quiet
+        start_time = Time.now
+        run_result = runner.run(cases, parallelism: parallelism)
+        duration = Time.now - start_time
+
+        # Flush spans before fetching comparison data from API
+        # This ensures the server has received all span data before we query for results
+        actual_tracer_provider = tracer_provider || OpenTelemetry.tracer_provider
+        actual_tracer_provider.force_flush if actual_tracer_provider.respond_to?(:force_flush)
+
+        # Fetch comparison summary from API
+        summary = fetch_comparison_summary(
+          experiment_id: experiment_id,
+          experiment_name: experiment,
+          project_name: project_name,
+          permalink: permalink,
+          duration: duration,
+          errors: run_result.errors,
+          raw_scores: run_result.scores,
+          state: state
+        )
+
+        # Create result with summary
+        result = Result.new(
+          experiment_id: experiment_id,
+          experiment_name: experiment,
+          project_id: project_id,
+          project_name: project_name,
+          permalink: permalink,
+          errors: run_result.errors,
+          duration: duration,
+          scores: run_result.scores,
+          summary: summary
+        )
+
         print_result(result) unless quiet
+        result
+      end
 
+      # Run evaluation locally without server (send_logs: false)
+      # No experiment created, no span data sent, local summary only
+      def run_local(project:, experiment:, task:, scorers:, cases:,
+        parallelism:, quiet:, state:)
+        # Create a no-op tracer provider that doesn't send data
+        no_op_tracer_provider = OpenTelemetry::SDK::Trace::TracerProvider.new
+
+        # Instantiate Runner with no-op tracer (no data sent)
+        runner = Runner.new(
+          experiment_id: nil,
+          experiment_name: experiment,
+          project_id: nil,
+          project_name: project,
+          task: task,
+          scorers: scorers,
+          state: state,
+          tracer_provider: no_op_tracer_provider
+        )
+
+        start_time = Time.now
+        run_result = runner.run(cases, parallelism: parallelism)
+        duration = Time.now - start_time
+
+        # Build local summary from raw scores
+        summary = ExperimentSummary.from_raw_scores(
+          run_result.scores,
+          {
+            project_name: project,
+            experiment_name: experiment,
+            experiment_id: nil,
+            experiment_url: nil,
+            duration: duration,
+            error_count: run_result.errors.length,
+            errors: run_result.errors
+          }
+        )
+
+        # Create result with local summary
+        result = Result.new(
+          experiment_id: nil,
+          experiment_name: experiment,
+          project_id: nil,
+          project_name: project,
+          permalink: nil,
+          errors: run_result.errors,
+          duration: duration,
+          scores: run_result.scores,
+          summary: summary
+        )
+
+        print_result(result) unless quiet
         result
       end
 
-      private
+      # Fetch comparison summary from API, falling back to local on failure or empty response
+      def fetch_comparison_summary(experiment_id:, experiment_name:, project_name:,
+        permalink:, duration:, errors:, raw_scores:, state:)
+        api = API.new(state: state)
+        local_metadata = {
+          project_name: project_name,
+          experiment_name: experiment_name,
+          experiment_id: experiment_id,
+          experiment_url: permalink,
+          duration: duration,
+          error_count: errors.length,
+          errors: errors
+        }
 
-      # Print result summary to stdout
-      # @param result [Result] The evaluation result
-      def print_result(result)
-        puts result.to_pretty
+        begin
+          api_response = api.experiments.comparison(experiment_id: experiment_id)
+
+          # If API returned empty scores, fall back to local data
+          if api_response["scores"].nil? || api_response["scores"].empty?
+            Log.debug("API returned no scores, using local summary")
+            return ExperimentSummary.from_raw_scores(raw_scores, local_metadata)
+          end
+
+          build_server_summary(api_response, local_metadata)
+        rescue => e
+          Log.warn("Failed to fetch comparison summary: #{e.message}. Falling back to local summary.")
+          ExperimentSummary.from_raw_scores(raw_scores, local_metadata)
+        end
+      end
+
+      # Build ExperimentSummary from API response
+      def build_server_summary(api_response, metadata)
+        # Transform API scores into ScoreSummary objects
+        scores = (api_response["scores"] || {}).map do |name, data|
+          [name, ScoreSummary.new(
+            name: name,
+            score: data["score"],
+            diff: data["diff"],
+            improvements: data["improvements"],
+            regressions: data["regressions"]
+          )]
+        end.to_h
+
+        # Transform API metrics into MetricSummary objects
+        metrics = (api_response["metrics"] || {}).map do |name, data|
+          [name, MetricSummary.new(
+            name: name,
+            metric: data["metric"],
+            unit: data["unit"] || "",
+            diff: data["diff"]
+          )]
+        end.to_h
+
+        # Build comparison info if present
+        comparison = if api_response["comparisonExperimentName"]
+          ComparisonInfo.new(
+            baseline_experiment_id: api_response["comparisonExperimentId"],
+            baseline_experiment_name: api_response["comparisonExperimentName"]
+          )
+        end
+
+        ExperimentSummary.new(
+          scores: scores,
+          metrics: metrics.empty? ? nil : metrics,
+          comparison: comparison,
+          **metadata
+        )
       end
 
       # Validate required parameters
diff --git a/lib/braintrust/eval/formatter.rb b/lib/braintrust/eval/formatter.rb
index d1cfa5f..efafdab 100644
--- a/lib/braintrust/eval/formatter.rb
+++ b/lib/braintrust/eval/formatter.rb
@@ -30,6 +30,15 @@ module Formatter
       # Maximum length for error messages before truncation
       MAX_ERROR_LENGTH = 150
 
+      # Column widths for comparison table
+      COLUMN_WIDTHS = {
+        name: 22,
+        value: 12,
+        change: 10,
+        improvements: 14,
+        regressions: 12
+      }.freeze
+
       class << self
         # Format an experiment summary for CLI output
         # @param summary [ExperimentSummary] The experiment summary
@@ -39,24 +48,41 @@ def format_experiment_summary(summary)
 
           lines = []
 
-          # Metadata section
-          lines << format_metadata_row("Project", summary.project_name)
-          lines << format_metadata_row("Experiment", summary.experiment_name)
-          lines << format_metadata_row("ID", summary.experiment_id)
-          lines << format_metadata_row("Duration", format_duration(summary.duration))
-          lines << format_metadata_row("Errors", summary.error_count.to_s)
+          # Comparison header (if comparing)
+          if summary.comparison&.baseline_experiment_name
+            lines << format_comparison_header(
+              summary.comparison.baseline_experiment_name,
+              summary.experiment_name
+            )
+            lines << ""
+          end
 
-          # Scores section (if any)
+          # Scores section
           if summary.scores&.any?
-            lines << ""
             lines << colorize("Scores", :white)
 
-            # Calculate max scorer name length for alignment
-            max_name_len = summary.scores.values.map { |s| s.name.length }.max || 0
-            name_width = [max_name_len + 2, 20].max # +2 for "◯ " prefix
+            if has_comparison_data?(summary.scores)
+              lines << format_scores_table_header
+              summary.scores.each_value do |score|
+                lines << format_comparison_score_row(score)
+              end
+            else
+              # Simple format without comparison columns
+              max_name_len = summary.scores.values.map { |s| s.name.length }.max || 0
+              name_width = [max_name_len + 2, 20].max
+              summary.scores.each_value do |score|
+                lines << format_simple_score_row(score, name_width)
+              end
+            end
+          end
 
-            summary.scores.each_value do |score|
-              lines << format_score_row(score, name_width)
+          # Metrics section (only if present - comparison mode)
+          if summary.metrics&.any?
+            lines << ""
+            lines << colorize("Metrics", :white)
+            lines << format_metrics_table_header
+            summary.metrics.each_value do |metric|
+              lines << format_metric_row(metric)
             end
           end
 
@@ -64,7 +90,6 @@ def format_experiment_summary(summary)
           if summary.errors&.any?
             lines << ""
             lines << colorize("Errors", :white)
-
             summary.errors.each do |error|
               lines << format_error_row(error)
             end
@@ -79,22 +104,151 @@ def format_experiment_summary(summary)
           wrap_in_box(lines, "Experiment summary")
         end
 
-        # Format a metadata row (label: value)
-        # @param label [String] Row label
-        # @param value [String] Row value
+        # Format comparison header line
+        # @param baseline [String] Baseline experiment name
+        # @param comparison [String] Comparison (current) experiment name
+        # @return [String] Formatted header
+        def format_comparison_header(baseline, comparison)
+          "#{baseline} (baseline) #{colorize("←", :gray)} #{comparison} (comparison)"
+        end
+
+        # Format table header for scores section (5 columns)
+        # @return [String] Header row
+        def format_scores_table_header
+          name = pad_cell("Name", COLUMN_WIDTHS[:name], :left)
+          value = pad_cell("Value", COLUMN_WIDTHS[:value], :right)
+          change = pad_cell("Change", COLUMN_WIDTHS[:change], :right)
+          improvements = pad_cell("Improvements", COLUMN_WIDTHS[:improvements], :right)
+          regressions = pad_cell("Regressions", COLUMN_WIDTHS[:regressions], :right)
+          colorize("#{name}#{value}#{change}#{improvements}#{regressions}", :dim)
+        end
+
+        # Format table header for metrics section (3 columns)
+        # @return [String] Header row
+        def format_metrics_table_header
+          name = pad_cell("Name", COLUMN_WIDTHS[:name], :left)
+          value = pad_cell("Value", COLUMN_WIDTHS[:value], :right)
+          change = pad_cell("Change", COLUMN_WIDTHS[:change], :right)
+          colorize("#{name}#{value}#{change}", :dim)
+        end
+
+        # Format a score row with all comparison columns (5 columns)
+        # @param score [ScoreSummary] The score summary
+        # @return [String] Formatted row
+        def format_comparison_score_row(score)
+          name = "#{colorize("◯", :blue)} #{score.name}"
+          value = format_score_value(score.score)
+          change = format_change(score.diff)
+          improvements = format_count(score.improvements, :green)
+          regressions = format_count(score.regressions, :red)
+
+          pad_cell(name, COLUMN_WIDTHS[:name], :left) +
+            pad_cell(value, COLUMN_WIDTHS[:value], :right) +
+            pad_cell(change, COLUMN_WIDTHS[:change], :right) +
+            pad_cell(improvements, COLUMN_WIDTHS[:improvements], :right) +
+            pad_cell(regressions, COLUMN_WIDTHS[:regressions], :right)
+        end
+
+        # Format a simple score row without comparison columns
+        # @param score [ScoreSummary] The score summary
+        # @param name_width [Integer] Width for the name column
         # @return [String] Formatted row
-        def format_metadata_row(label, value)
-          "#{colorize(label + ":", :dim)} #{value}"
+        def format_simple_score_row(score, name_width = 20)
+          name = "#{colorize("◯", :blue)} #{score.name}"
+          value = format_score_value(score.score)
+          pad_cell(name, name_width, :left) + " " + pad_cell(value, 10, :right)
+        end
+
+        # Format a metric row (3 columns)
+        # @param metric [MetricSummary] The metric summary
+        # @return [String] Formatted row
+        def format_metric_row(metric)
+          name = "#{colorize("◯", :magenta)} #{metric.name}"
+          value = format_metric_value(metric.metric, metric.unit)
+          change = format_change(metric.diff)
+
+          pad_cell(name, COLUMN_WIDTHS[:name], :left) +
+            pad_cell(value, COLUMN_WIDTHS[:value], :right) +
+            pad_cell(change, COLUMN_WIDTHS[:change], :right)
         end
 
-        # Format duration for display
-        # @param duration [Float] Duration in seconds
-        # @return [String] Formatted duration (e.g., "1.2345s" or "123ms")
-        def format_duration(duration)
-          if duration < 1
-            "#{(duration * 1000).round(0)}ms"
+        # Format a score value as percentage
+        # @param score [Float] Score value (0.0 to 1.0)
+        # @return [String] Formatted percentage
+        def format_score_value(score)
+          return colorize("-", :gray) if score.nil?
+          colorize("#{(score * 100).round(2)}%", :white)
+        end
+
+        # Format a metric value with unit
+        # @param value [Float] Metric value
+        # @param unit [String] Unit suffix
+        # @return [String] Formatted value with unit
+        def format_metric_value(value, unit)
+          return colorize("-", :gray) if value.nil?
+
+          # Format based on magnitude and type
+          formatted = if value == value.to_i
+            value.to_i.to_s
+          elsif value < 0.01
+            value.round(4).to_s
+          else
+            value.round(2).to_s
+          end
+
+          colorize("#{formatted}#{unit}", :white)
+        end
+
+        # Format a change value (diff)
+        # @param diff [Float, nil] Difference value (as ratio, e.g., 0.05 = +5%)
+        # @return [String] Formatted change with color
+        def format_change(diff)
+          return colorize("-", :gray) if diff.nil?
+
+          # diff is already a ratio, convert to percentage
+          percentage = (diff * 100).round(2)
+          sign = (percentage >= 0) ? "+" : ""
+          formatted = "#{sign}#{percentage}%"
+
+          if percentage > 0
+            colorize(formatted, :green)
+          elsif percentage < 0
+            colorize(formatted, :red)
           else
-            "#{duration.round(4)}s"
+            colorize(formatted, :gray)
+          end
+        end
+
+        # Format an improvement/regression count
+        # @param count [Integer, nil] Count value
+        # @param color [Symbol] Color to apply if non-zero
+        # @return [String] Formatted count
+        def format_count(count, color = nil)
+          return colorize("-", :gray) if count.nil? || count == 0
+
+          if color
+            colorize(count.to_s, :dim, color)
+          else
+            count.to_s
+          end
+        end
+
+        # Check if any scores have comparison data
+        # @param scores [Hash<String, ScoreSummary>] Scores to check
+        # @return [Boolean] True if any score has diff data
+        def has_comparison_data?(scores)
+          scores&.values&.any? { |s| !s.diff.nil? }
+        end
+
+        # Format a duration value for display
+        # Shows milliseconds for < 1 second, seconds otherwise
+        # @param seconds [Float] Duration in seconds
+        # @return [String] Formatted duration (e.g., "500ms" or "1.2345s")
+        def format_duration(seconds)
+          if seconds < 1
+            "#{(seconds * 1000).round}ms"
+          else
+            "#{seconds.round(4)}s"
           end
         end
 
@@ -125,16 +279,6 @@ def colorize(text, *styles)
           "#{codes}#{text}#{COLORS[:reset]}"
         end
 
-        # Format a score row for display
-        # @param score [ScorerStats] The scorer statistics
-        # @param name_width [Integer] Width for the name column
-        # @return [String] Formatted row
-        def format_score_row(score, name_width = 20)
-          name = "#{colorize("◯", :blue)} #{score.name}"
-          value = colorize("#{(score.score_mean * 100).round(2)}%", :white)
-          pad_cell(name, name_width, :left) + " " + pad_cell(value, 10, :right)
-        end
-
         # Pad a cell to a given width, accounting for ANSI codes
         # @param text [String] Cell text (may contain ANSI codes)
         # @param width [Integer] Target width
@@ -156,8 +300,6 @@ def pad_cell(text, width, align)
         # @param text [String] Text that may contain escape sequences
         # @return [Integer] Visible character count
         def visible_text_length(text)
-          # Strip ANSI color codes: \e[...m
-          # Strip OSC 8 hyperlinks: \e]8;;...\e\\ (the URL part is invisible)
           text
             .gsub(/\e\[[0-9;]*m/, "")           # ANSI color codes
             .gsub(/\e\]8;;[^\e]*\e\\/, "")      # OSC 8 hyperlink sequences
diff --git a/lib/braintrust/eval/result.rb b/lib/braintrust/eval/result.rb
index c18af30..b552075 100644
--- a/lib/braintrust/eval/result.rb
+++ b/lib/braintrust/eval/result.rb
@@ -6,22 +6,23 @@
 module Braintrust
   module Eval
     # Result represents the outcome of an evaluation run
-    # Contains experiment metadata, errors, timing information, and raw score data
+    # Contains experiment metadata, errors, timing information, and summary data
     class Result
       attr_reader :experiment_id, :experiment_name, :project_id, :project_name,
-        :permalink, :errors, :duration, :scores
+        :permalink, :errors, :duration, :scores, :summary
 
       # Create a new result
-      # @param experiment_id [String] The experiment ID
+      # @param experiment_id [String, nil] The experiment ID (nil for local-only mode)
       # @param experiment_name [String] The experiment name
-      # @param project_id [String] The project ID
+      # @param project_id [String, nil] The project ID (nil for local-only mode)
       # @param project_name [String] The project name
-      # @param permalink [String] Link to view the experiment in Braintrust UI
+      # @param permalink [String, nil] Link to view the experiment in Braintrust UI
       # @param errors [Array<String>] List of errors that occurred
       # @param duration [Float] Duration in seconds
       # @param scores [Hash, nil] Raw score data { scorer_name => Array<Numeric> }
+      # @param summary [ExperimentSummary, nil] Pre-computed summary (if nil, computed lazily)
       def initialize(experiment_id:, experiment_name:, project_id:, project_name:,
-        permalink:, errors:, duration:, scores: nil)
+        permalink:, errors:, duration:, scores: nil, summary: nil)
         @experiment_id = experiment_id
         @experiment_name = experiment_name
         @project_id = project_id
@@ -30,6 +31,7 @@ def initialize(experiment_id:, experiment_name:, project_id:, project_name:,
         @errors = errors
         @duration = duration
         @scores = scores
+        @summary = summary || build_summary_without_comparison
       end
 
       # Check if the evaluation was successful (no errors)
@@ -44,23 +46,18 @@ def failed?
         !success?
       end
 
-      # Get the experiment summary (lazily computed)
-      # @return [ExperimentSummary] Summary view model for Formatter
-      def summary
-        @summary ||= build_summary
-      end
-
       # Format the result as a human-readable string (Go SDK format)
       # @return [String]
       def to_s
-        [
+        lines = [
           "Experiment: #{experiment_name}",
-          "Project: #{project_name}",
-          "ID: #{experiment_id}",
-          "Link: #{permalink}",
-          "Duration: #{duration.round(4)}s",
-          "Errors: #{errors.length}"
-        ].join("\n")
+          "Project: #{project_name}"
+        ]
+        lines << "ID: #{experiment_id}" if experiment_id
+        lines << "Link: #{permalink}" if permalink
+        lines << "Duration: #{duration.round(4)}s"
+        lines << "Errors: #{errors.length}"
+        lines.join("\n")
       end
 
       # Format the result as a pretty CLI output with box drawing and colors
@@ -69,40 +66,22 @@ def to_pretty
         Formatter.format_experiment_summary(summary)
       end
 
-      # Get statistics for all scorers (lazily computed from scores)
-      # @return [Hash<String, ScorerStats>] Scorer stats keyed by scorer name
-      def scorer_stats
-        @scorer_stats ||= build_scorer_stats
-      end
-
       private
 
-      # Build scorer statistics from raw score data
-      # @return [Hash<String, ScorerStats>] Scorer stats keyed by scorer name
-      def build_scorer_stats
-        return {} if scores.nil? || scores.empty?
-
-        stats = {}
-        scores.each do |name, score_values|
-          next if score_values.empty?
-          mean = score_values.sum.to_f / score_values.size
-          stats[name] = ScorerStats.new(name: name, score_mean: mean)
-        end
-        stats
-      end
-
-      # Build experiment summary view model
-      # @return [ExperimentSummary] Summary with all data for Formatter
-      def build_summary
-        ExperimentSummary.new(
-          project_name: project_name,
-          experiment_name: experiment_name,
-          experiment_id: experiment_id,
-          experiment_url: permalink,
-          scores: scorer_stats,
-          duration: duration,
-          error_count: errors.length,
-          errors: errors
+      # Build summary from raw scores when comparison data is unavailable
+      # @return [ExperimentSummary]
+      def build_summary_without_comparison
+        ExperimentSummary.from_raw_scores(
+          scores || {},
+          {
+            project_name: project_name,
+            experiment_name: experiment_name,
+            experiment_id: experiment_id,
+            experiment_url: permalink,
+            duration: duration,
+            error_count: errors.length,
+            errors: errors
+          }
         )
       end
     end
diff --git a/lib/braintrust/eval/summary.rb b/lib/braintrust/eval/summary.rb
index 2f3639c..d591594 100644
--- a/lib/braintrust/eval/summary.rb
+++ b/lib/braintrust/eval/summary.rb
@@ -2,31 +2,92 @@
 
 module Braintrust
   module Eval
-    # Aggregated statistics for a single scorer across test cases
-    # @attr name [String] Scorer name
-    # @attr score_mean [Float] Mean score (0.0 to 1.0)
-    ScorerStats = Struct.new(:name, :score_mean, keyword_init: true)
+    # Score summary - unified for both local and comparison modes
+    # For local mode: diff/improvements/regressions are nil
+    # @attr name [String] Score name
+    # @attr score [Float] Average score (0.0 to 1.0)
+    # @attr diff [Float, nil] Difference vs baseline (percentage, e.g., 0.05 = +5%)
+    # @attr improvements [Integer, nil] Count of improved test cases
+    # @attr regressions [Integer, nil] Count of regressed test cases
+    class ScoreSummary
+      attr_reader :name, :score, :diff, :improvements, :regressions
+
+      def initialize(name:, score:, diff: nil, improvements: nil, regressions: nil)
+        @name = name
+        @score = score
+        @diff = diff
+        @improvements = improvements
+        @regressions = regressions
+      end
+
+      # Build from raw score values (computes mean)
+      # @param name [String] Score name
+      # @param values [Array<Numeric>] Raw score values
+      # @return [ScoreSummary]
+      def self.from_values(name, values)
+        return new(name: name, score: 0.0) if values.empty?
+        mean = values.sum.to_f / values.size
+        new(name: name, score: mean)
+      end
+    end
+
+    # Metric summary for server-computed metrics (duration, tokens, etc.)
+    # @attr name [String] Metric name
+    # @attr metric [Float] Metric value
+    # @attr unit [String] Unit label (e.g., "ms", "$", "tok")
+    # @attr diff [Float, nil] Difference vs baseline (percentage)
+    MetricSummary = Struct.new(:name, :metric, :unit, :diff, keyword_init: true)
+
+    # Comparison metadata for the summary header
+    # @attr baseline_experiment_id [String, nil] Baseline experiment ID
+    # @attr baseline_experiment_name [String, nil] Baseline experiment name
+    ComparisonInfo = Struct.new(:baseline_experiment_id, :baseline_experiment_name, keyword_init: true)
 
     # Summary of results from an Experiment
     # Typically used to generate experiment output
     # @attr project_name [String] Project name
     # @attr experiment_name [String] Experiment name
-    # @attr experiment_id [String] Experiment ID
-    # @attr experiment_url [String] URL to view experiment in Braintrust UI
-    # @attr scores [Hash<String, ScorerStats>] Scorer stats keyed by scorer name
+    # @attr experiment_id [String, nil] Experiment ID (nil for local-only mode)
+    # @attr experiment_url [String, nil] URL to view experiment in Braintrust UI
+    # @attr scores [Hash<String, ScoreSummary>] Score summaries keyed by scorer name
+    # @attr metrics [Hash<String, MetricSummary>, nil] Metric summaries (nil for local mode)
+    # @attr comparison [ComparisonInfo, nil] Comparison metadata (nil for local mode)
     # @attr duration [Float] Duration in seconds
     # @attr error_count [Integer] Number of errors
     # @attr errors [Array<String>] Error messages with locations
-    ExperimentSummary = Struct.new(
-      :project_name,
-      :experiment_name,
-      :experiment_id,
-      :experiment_url,
-      :scores,
-      :duration,
-      :error_count,
-      :errors,
-      keyword_init: true
-    )
+    class ExperimentSummary
+      attr_reader :project_name, :experiment_name, :experiment_id, :experiment_url,
+        :scores, :metrics, :comparison, :duration, :error_count, :errors
+
+      def initialize(project_name:, experiment_name:, experiment_id:, experiment_url:,
+        scores:, duration:, error_count:, errors:, metrics: nil, comparison: nil)
+        @project_name = project_name
+        @experiment_name = experiment_name
+        @experiment_id = experiment_id
+        @experiment_url = experiment_url
+        @scores = scores
+        @metrics = metrics
+        @comparison = comparison
+        @duration = duration
+        @error_count = error_count
+        @errors = errors
+      end
+
+      # Build from raw score values (local mode, no comparison)
+      # @param raw_scores [Hash<String, Array<Numeric>>] Raw score values
+      # @param metadata [Hash] Experiment metadata (project_name, experiment_name, duration, errors, etc.)
+      # @return [ExperimentSummary]
+      def self.from_raw_scores(raw_scores, metadata)
+        scores = (raw_scores || {}).map do |name, values|
+          [name.to_s, ScoreSummary.from_values(name.to_s, values)]
+        end.to_h
+        new(
+          scores: scores,
+          metrics: nil,
+          comparison: nil,
+          **metadata
+        )
+      end
+    end
   end
 end
diff --git a/test/braintrust/api/experiments_test.rb b/test/braintrust/api/experiments_test.rb
new file mode 100644
index 0000000..0a5ec12
--- /dev/null
+++ b/test/braintrust/api/experiments_test.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class Braintrust::API::ExperimentsTest < Minitest::Test
+  # Note: These tests require recorded VCR cassettes with valid experiment IDs.
+  # The experiments endpoint is exercised during the eval_test.rb integration tests.
+  # These unit tests are placeholders for future direct API testing.
+
+  def test_comparison_method_exists
+    # Test that the comparison method exists with correct signature
+    # This is a simple unit test that doesn't require API access
+    api = Braintrust::API
+    experiments_class = api::Experiments
+
+    assert experiments_class.instance_methods.include?(:comparison)
+  end
+
+  def test_experiments_accessor_on_api
+    skip "Requires API key" unless ENV["BRAINTRUST_API_KEY"]
+
+    # Test that the experiments accessor returns an Experiments instance
+    VCR.use_cassette("api/init") do
+      state = get_integration_test_state(enable_tracing: false)
+      api = Braintrust::API.new(state: state)
+
+      assert_instance_of Braintrust::API::Experiments, api.experiments
+    end
+  end
+end
diff --git a/test/braintrust/eval/formatter_test.rb b/test/braintrust/eval/formatter_test.rb
index 05dcd89..3c1f331 100644
--- a/test/braintrust/eval/formatter_test.rb
+++ b/test/braintrust/eval/formatter_test.rb
@@ -57,10 +57,10 @@ def test_terminal_link_osc8_when_tty
     end
   end
 
-  def test_format_score_row
-    # Test formatting a score row
-    score = Braintrust::Eval::ScorerStats.new(name: "exact_match", score_mean: 0.923)
-    result = Braintrust::Eval::Formatter.format_score_row(score)
+  def test_format_simple_score_row
+    # Test formatting a simple score row (no comparison data)
+    score = Braintrust::Eval::ScoreSummary.new(name: "exact_match", score: 0.923)
+    result = Braintrust::Eval::Formatter.format_simple_score_row(score)
 
     assert_match(/exact_match/, result)
     assert_match(/92\.3%/, result)
@@ -75,8 +75,8 @@ def test_format_experiment_summary_without_tty
         experiment_id: "exp-123",
         experiment_url: "https://braintrust.dev/exp/123",
         scores: {
-          "accuracy" => Braintrust::Eval::ScorerStats.new(name: "accuracy", score_mean: 0.85),
-          "relevance" => Braintrust::Eval::ScorerStats.new(name: "relevance", score_mean: 0.92)
+          "accuracy" => Braintrust::Eval::ScoreSummary.new(name: "accuracy", score: 0.85),
+          "relevance" => Braintrust::Eval::ScoreSummary.new(name: "relevance", score: 0.92)
         },
         duration: 1.2345,
         error_count: 0,
@@ -89,13 +89,6 @@ def test_format_experiment_summary_without_tty
       assert_match(/╭─ Experiment summary/, result)
       assert_match(/╰─+╯/, result)
 
-      # Check metadata
-      assert_match(/Experiment:.*my-experiment/, result)
-      assert_match(/Project:.*my-project/, result)
-      assert_match(/ID:.*exp-123/, result)
-      assert_match(/Duration:.*1\.2345s/, result)  # >= 1s shows as seconds
-      assert_match(/Errors:.*0/, result)
-
       # Check scores section
       assert_match(/Scores/, result)
       assert_match(/accuracy/, result)
@@ -110,7 +103,7 @@ def test_format_experiment_summary_without_tty
   end
 
   def test_format_experiment_summary_with_errors
-    # Test formatting a summary with errors (also tests millisecond duration)
+    # Test formatting a summary with errors
     stub_tty(false) do
       summary = Braintrust::Eval::ExperimentSummary.new(
         project_name: "my-project",
@@ -118,7 +111,7 @@ def test_format_experiment_summary_with_errors
         experiment_id: "exp-123",
         experiment_url: "https://braintrust.dev/exp/123",
         scores: {},
-        duration: 0.5,  # < 1s, should display as 500ms
+        duration: 0.5,
         error_count: 2,
         errors: [
           "Task failed for input 'bad': division by zero",
@@ -128,10 +121,6 @@ def test_format_experiment_summary_with_errors
 
       result = Braintrust::Eval::Formatter.format_experiment_summary(summary)
 
-      # Check metadata shows error count and millisecond duration
-      assert_match(/Duration:.*500ms/, result)
-      assert_match(/Errors:.*2/, result)
-
       # Check errors section
       assert_match(/Errors/, result)  # Section header
       assert_match(/Task failed for input 'bad'/, result)
@@ -147,11 +136,27 @@ def test_format_experiment_summary_empty
     assert_equal "", result
   end
 
-  def test_format_metadata_row
-    # Test metadata row formatting
+  def test_format_change_positive
+    # Test change formatting for positive values
+    stub_tty(false) do
+      result = Braintrust::Eval::Formatter.format_change(0.05)  # +5%
+      assert_equal "+5.0%", result
+    end
+  end
+
+  def test_format_change_negative
+    # Test change formatting for negative values
+    stub_tty(false) do
+      result = Braintrust::Eval::Formatter.format_change(-0.1)  # -10%
+      assert_equal "-10.0%", result
+    end
+  end
+
+  def test_format_change_nil
+    # Test change formatting for nil values
     stub_tty(false) do
-      result = Braintrust::Eval::Formatter.format_metadata_row("Label", "value")
-      assert_equal "Label: value", result
+      result = Braintrust::Eval::Formatter.format_change(nil)
+      assert_equal "-", result
     end
   end
 
@@ -229,6 +234,191 @@ def test_wrap_in_box_without_tty
     end
   end
 
+  # Comparison formatting tests
+  def test_format_comparison_header
+    stub_tty(false) do
+      result = Braintrust::Eval::Formatter.format_comparison_header("baseline-exp", "current-exp")
+      assert_match(/baseline-exp/, result)
+      assert_match(/current-exp/, result)
+      assert_match(/baseline/, result)
+      assert_match(/comparison/, result)
+    end
+  end
+
+  def test_format_comparison_score_row
+    stub_tty(false) do
+      score = Braintrust::Eval::ScoreSummary.new(
+        name: "accuracy",
+        score: 0.85,
+        diff: 0.05,
+        improvements: 3,
+        regressions: 1
+      )
+
+      result = Braintrust::Eval::Formatter.format_comparison_score_row(score)
+
+      assert_match(/accuracy/, result)
+      assert_match(/85\.0%/, result)
+      assert_match(/\+5\.0%/, result)
+      assert_match(/3/, result)
+      assert_match(/1/, result)
+    end
+  end
+
+  def test_format_metric_row
+    stub_tty(false) do
+      metric = Braintrust::Eval::MetricSummary.new(
+        name: "duration",
+        metric: 1.25,
+        unit: "s",
+        diff: -0.1
+      )
+
+      result = Braintrust::Eval::Formatter.format_metric_row(metric)
+
+      assert_match(/duration/, result)
+      assert_match(/1\.25s/, result)
+      assert_match(/-10\.0%/, result)
+    end
+  end
+
+  def test_format_score_value
+    stub_tty(false) do
+      # Normal value
+      assert_equal "85.0%", Braintrust::Eval::Formatter.format_score_value(0.85)
+      # Nil value
+      assert_equal "-", Braintrust::Eval::Formatter.format_score_value(nil)
+      # 100%
+      assert_equal "100.0%", Braintrust::Eval::Formatter.format_score_value(1.0)
+      # 0%
+      assert_equal "0.0%", Braintrust::Eval::Formatter.format_score_value(0.0)
+    end
+  end
+
+  def test_format_metric_value
+    stub_tty(false) do
+      # Normal decimal value
+      assert_equal "1.25s", Braintrust::Eval::Formatter.format_metric_value(1.25, "s")
+      # Integer value
+      assert_equal "150tok", Braintrust::Eval::Formatter.format_metric_value(150.0, "tok")
+      # Small value
+      assert_equal "0.0012ms", Braintrust::Eval::Formatter.format_metric_value(0.0012, "ms")
+      # Nil value
+      assert_equal "-", Braintrust::Eval::Formatter.format_metric_value(nil, "s")
+    end
+  end
+
+  def test_format_count
+    stub_tty(false) do
+      # Normal count
+      assert_equal "5", Braintrust::Eval::Formatter.format_count(5)
+      # Zero returns dash
+      assert_equal "-", Braintrust::Eval::Formatter.format_count(0)
+      # Nil returns dash
+      assert_equal "-", Braintrust::Eval::Formatter.format_count(nil)
+    end
+  end
+
+  def test_has_comparison_data
+    # With diff data
+    scores_with_diff = {
+      "test" => Braintrust::Eval::ScoreSummary.new(name: "test", score: 0.5, diff: 0.1)
+    }
+    assert Braintrust::Eval::Formatter.has_comparison_data?(scores_with_diff)
+
+    # Without diff data
+    scores_without_diff = {
+      "test" => Braintrust::Eval::ScoreSummary.new(name: "test", score: 0.5)
+    }
+    refute Braintrust::Eval::Formatter.has_comparison_data?(scores_without_diff)
+
+    # Empty scores
+    refute Braintrust::Eval::Formatter.has_comparison_data?({})
+
+    # Nil scores
+    refute Braintrust::Eval::Formatter.has_comparison_data?(nil)
+  end
+
+  def test_format_experiment_summary_with_comparison
+    stub_tty(false) do
+      comparison = Braintrust::Eval::ComparisonInfo.new(
+        baseline_experiment_id: "base-123",
+        baseline_experiment_name: "baseline-exp"
+      )
+      scores = {
+        "accuracy" => Braintrust::Eval::ScoreSummary.new(
+          name: "accuracy",
+          score: 0.9,
+          diff: 0.05,
+          improvements: 2,
+          regressions: 1
+        )
+      }
+      metrics = {
+        "duration" => Braintrust::Eval::MetricSummary.new(
+          name: "duration",
+          metric: 1.5,
+          unit: "s",
+          diff: -0.1
+        )
+      }
+
+      summary = Braintrust::Eval::ExperimentSummary.new(
+        project_name: "project",
+        experiment_name: "experiment",
+        experiment_id: "exp-789",
+        experiment_url: "https://example.com",
+        scores: scores,
+        metrics: metrics,
+        comparison: comparison,
+        duration: 10.0,
+        error_count: 0,
+        errors: []
+      )
+
+      result = Braintrust::Eval::Formatter.format_experiment_summary(summary)
+
+      # Check comparison header
+      assert_match(/baseline-exp.*baseline.*experiment.*comparison/i, result)
+
+      # Check scores section with all columns
+      assert_match(/Scores/, result)
+      assert_match(/accuracy/, result)
+      assert_match(/90\.0%/, result)
+      assert_match(/\+5\.0%/, result)
+
+      # Check metrics section
+      assert_match(/Metrics/, result)
+      assert_match(/duration/, result)
+      assert_match(/1\.5s/, result)
+      assert_match(/-10\.0%/, result)
+    end
+  end
+
+  def test_format_scores_table_header
+    stub_tty(false) do
+      header = Braintrust::Eval::Formatter.format_scores_table_header
+
+      assert_match(/Name/, header)
+      assert_match(/Value/, header)
+      assert_match(/Change/, header)
+      assert_match(/Improvements/, header)
+      assert_match(/Regressions/, header)
+    end
+  end
+
+  def test_format_metrics_table_header
+    stub_tty(false) do
+      header = Braintrust::Eval::Formatter.format_metrics_table_header
+
+      assert_match(/Name/, header)
+      assert_match(/Value/, header)
+      assert_match(/Change/, header)
+      refute_match(/Improvements/, header)
+      refute_match(/Regressions/, header)
+    end
+  end
+
   private
 
   # Helper to stub $stdout.tty? for testing
diff --git a/test/braintrust/eval/functions_test.rb b/test/braintrust/eval/functions_test.rb
index cef3e91..a1a6f50 100644
--- a/test/braintrust/eval/functions_test.rb
+++ b/test/braintrust/eval/functions_test.rb
@@ -11,14 +11,14 @@ def setup
   end
 
   def get_test_state_and_api
-    state = get_integration_test_state
-    api = Braintrust::API.new(state: state)
-    [state, api]
+    rig = get_integration_test_state_with_memory_exporter
+    api = Braintrust::API.new(state: rig[:state])
+    [rig, api]
   end
 
   def test_functions_task_returns_callable
     VCR.use_cassette("eval_functions/task_callable") do
-      state, api = get_test_state_and_api
+      rig, api = get_test_state_and_api
       # This test verifies that Functions.task returns a callable object
       # The callable should accept an input and invoke the remote function
       function_slug = "test-ruby-sdk-task-callable"
@@ -46,7 +46,7 @@ def test_functions_task_returns_callable
       task = Braintrust::Eval::Functions.task(
         project: @project_name,
         slug: function_slug,
-        state: state
+        state: rig[:state]
       )
 
       # Should be callable
@@ -56,7 +56,7 @@ def test_functions_task_returns_callable
 
   def test_functions_task_invokes_remote
     VCR.use_cassette("eval_functions/task_invoke") do
-      state, api = get_test_state_and_api
+      rig, api = get_test_state_and_api
       # This test verifies that calling the task actually invokes the remote function
       function_slug = "test-ruby-sdk-task-invoke"
 
@@ -83,7 +83,7 @@ def test_functions_task_invokes_remote
       task = Braintrust::Eval::Functions.task(
         project: @project_name,
         slug: function_slug,
-        state: state
+        state: rig[:state]
       )
 
       result = task.call("world")
@@ -96,7 +96,7 @@ def test_functions_task_invokes_remote
 
   def test_functions_scorer_returns_scorer
     VCR.use_cassette("eval_functions/scorer") do
-      state, api = get_test_state_and_api
+      rig, api = get_test_state_and_api
       # This test verifies that Functions.scorer returns a Scorer object
       function_slug = "test-ruby-sdk-scorer"
 
@@ -124,7 +124,7 @@ def test_functions_scorer_returns_scorer
       scorer = Braintrust::Eval::Functions.scorer(
         project: @project_name,
         slug: function_slug,
-        state: state
+        state: rig[:state]
       )
 
       # Should be a Scorer instance
@@ -135,7 +135,7 @@ def test_functions_scorer_returns_scorer
 
   def test_use_remote_task_in_eval_run
     VCR.use_cassette("eval_functions/eval_run") do
-      state, api = get_test_state_and_api
+      rig, api = get_test_state_and_api
       # This test verifies that remote tasks can be used in Eval.run
       # This is the main use case: calling server-side prompts in evals
       function_slug = "test-ruby-sdk-eval-task"
@@ -163,7 +163,7 @@ def test_use_remote_task_in_eval_run
       task = Braintrust::Eval::Functions.task(
         project: @project_name,
         slug: function_slug,
-        state: state
+        state: rig[:state]
       )
 
       # Use in Eval.run with a simple exact match scorer
@@ -181,7 +181,8 @@ def test_use_remote_task_in_eval_run
             output.to_s.include?(expected) ? 1.0 : 0.0
           end
         ],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -193,7 +194,7 @@ def test_use_remote_task_in_eval_run
 
   def test_use_remote_scorer_in_eval_run
     VCR.use_cassette("eval_functions/remote_scorer") do
-      state, api = get_test_state_and_api
+      rig, api = get_test_state_and_api
       # This test verifies that remote scorers can be used in Eval.run
       # This tests the "online scorer" functionality
       function_slug = "test-ruby-sdk-eval-scorer"
@@ -230,7 +231,7 @@ def test_use_remote_scorer_in_eval_run
       scorer = Braintrust::Eval::Functions.scorer(
         project: @project_name,
         slug: function_slug,
-        state: state
+        state: rig[:state]
       )
 
       # Simple task that uppercases
@@ -246,7 +247,8 @@ def test_use_remote_scorer_in_eval_run
         ],
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
diff --git a/test/braintrust/eval/result_test.rb b/test/braintrust/eval/result_test.rb
index 40d4cfd..cee8960 100644
--- a/test/braintrust/eval/result_test.rb
+++ b/test/braintrust/eval/result_test.rb
@@ -97,8 +97,8 @@ def test_result_requires_all_fields
     end
   end
 
-  def test_scorer_stats_computes_mean
-    # Test that scorer_stats computes mean from raw scores
+  def test_summary_scores_computes_mean
+    # Test that summary scores computes mean from raw scores
     result = Braintrust::Eval::Result.new(
       experiment_id: "exp_123",
       experiment_name: "my-experiment",
@@ -113,17 +113,17 @@ def test_scorer_stats_computes_mean
       }
     )
 
-    stats = result.scorer_stats
+    scores = result.summary.scores
 
-    assert_equal 2, stats.size
-    assert_equal "exact_match", stats["exact_match"].name
-    assert_equal 0.75, stats["exact_match"].score_mean
-    assert_equal "relevance", stats["relevance"].name
-    assert_in_delta 0.8, stats["relevance"].score_mean, 0.001
+    assert_equal 2, scores.size
+    assert_equal "exact_match", scores["exact_match"].name
+    assert_equal 0.75, scores["exact_match"].score
+    assert_equal "relevance", scores["relevance"].name
+    assert_in_delta 0.8, scores["relevance"].score, 0.001
   end
 
-  def test_scorer_stats_empty_when_no_scores
-    # Test scorer_stats returns empty hash when no score data
+  def test_summary_scores_empty_when_no_scores
+    # Test summary.scores returns empty hash when no score data
     result = Braintrust::Eval::Result.new(
       experiment_id: "exp_123",
       experiment_name: "my-experiment",
@@ -134,7 +134,7 @@ def test_scorer_stats_empty_when_no_scores
       duration: 1.5
     )
 
-    assert_equal({}, result.scorer_stats)
+    assert_equal({}, result.summary.scores)
   end
 
   def test_summary_builds_from_scores
@@ -160,7 +160,7 @@ def test_summary_builds_from_scores
     assert_equal "exp_123", summary.experiment_id
     assert_equal "https://braintrust.dev/link", summary.experiment_url
     assert_equal 1, summary.scores.size
-    assert_in_delta 0.6667, summary.scores["exact_match"].score_mean, 0.001
+    assert_in_delta 0.6667, summary.scores["exact_match"].score, 0.001
     assert_equal 1.5, summary.duration
     assert_equal 0, summary.error_count
     assert_equal [], summary.errors
@@ -229,7 +229,7 @@ def test_to_pretty_with_scores
   end
 
   def test_to_pretty_without_scores
-    # Test to_pretty still works when no score data (shows metadata only)
+    # Test to_pretty still works when no score data (shows link only)
     result = Braintrust::Eval::Result.new(
       experiment_id: "exp_123",
       experiment_name: "my-experiment",
@@ -243,11 +243,7 @@ def test_to_pretty_without_scores
     output = result.to_pretty
 
     assert_match(/Experiment summary/, output)
-    assert_match(/Experiment:.*my-experiment/, output)
-    assert_match(/Project:.*my-project/, output)
-    assert_match(/ID:.*exp_123/, output)
-    assert_match(/Duration:.*1\.5s/, output)  # >= 1s shows as seconds
-    assert_match(/Errors:.*0/, output)
+    assert_match(/View results for my-experiment/, output)
     # Should not have Scores section
     refute_match(/Scores/, output)
   end
@@ -266,7 +262,6 @@ def test_to_pretty_with_errors
 
     output = result.to_pretty
 
-    assert_match(/Errors:.*1/, output)
     assert_match(/Errors/, output)  # Errors section header
     assert_match(/Task failed for input 'bad'/, output)
   end
diff --git a/test/braintrust/eval/summary_test.rb b/test/braintrust/eval/summary_test.rb
new file mode 100644
index 0000000..7bcba4f
--- /dev/null
+++ b/test/braintrust/eval/summary_test.rb
@@ -0,0 +1,231 @@
+# frozen_string_literal: true
+
+require "test_helper"
+require "braintrust/eval/summary"
+
+class Braintrust::Eval::SummaryTest < Minitest::Test
+  # ScoreSummary tests
+  def test_score_summary_struct_fields
+    score = Braintrust::Eval::ScoreSummary.new(
+      name: "accuracy",
+      score: 0.85,
+      diff: 0.05,
+      improvements: 3,
+      regressions: 1
+    )
+
+    assert_equal "accuracy", score.name
+    assert_equal 0.85, score.score
+    assert_equal 0.05, score.diff
+    assert_equal 3, score.improvements
+    assert_equal 1, score.regressions
+  end
+
+  def test_score_summary_from_values_computes_mean
+    score = Braintrust::Eval::ScoreSummary.from_values("test", [1.0, 0.5, 0.8])
+
+    assert_equal "test", score.name
+    assert_in_delta 0.7667, score.score, 0.001
+    assert_nil score.diff
+    assert_nil score.improvements
+    assert_nil score.regressions
+  end
+
+  def test_score_summary_from_values_handles_empty_array
+    score = Braintrust::Eval::ScoreSummary.from_values("test", [])
+
+    assert_equal "test", score.name
+    assert_equal 0.0, score.score
+  end
+
+  def test_score_summary_from_values_with_single_value
+    score = Braintrust::Eval::ScoreSummary.from_values("test", [0.9])
+
+    assert_equal "test", score.name
+    assert_equal 0.9, score.score
+  end
+
+  def test_score_summary_optional_fields_nil_by_default
+    score = Braintrust::Eval::ScoreSummary.new(name: "test", score: 0.5)
+
+    assert_equal "test", score.name
+    assert_equal 0.5, score.score
+    assert_nil score.diff
+    assert_nil score.improvements
+    assert_nil score.regressions
+  end
+
+  # MetricSummary tests
+  def test_metric_summary_struct_fields
+    metric = Braintrust::Eval::MetricSummary.new(
+      name: "duration",
+      metric: 1.25,
+      unit: "s",
+      diff: -0.05
+    )
+
+    assert_equal "duration", metric.name
+    assert_equal 1.25, metric.metric
+    assert_equal "s", metric.unit
+    assert_equal(-0.05, metric.diff)
+  end
+
+  def test_metric_summary_with_nil_diff
+    metric = Braintrust::Eval::MetricSummary.new(
+      name: "tokens",
+      metric: 150,
+      unit: "tok"
+    )
+
+    assert_equal "tokens", metric.name
+    assert_equal 150, metric.metric
+    assert_equal "tok", metric.unit
+    assert_nil metric.diff
+  end
+
+  # ComparisonInfo tests
+  def test_comparison_info_struct_fields
+    comparison = Braintrust::Eval::ComparisonInfo.new(
+      baseline_experiment_id: "base-123",
+      baseline_experiment_name: "baseline-exp"
+    )
+
+    assert_equal "base-123", comparison.baseline_experiment_id
+    assert_equal "baseline-exp", comparison.baseline_experiment_name
+  end
+
+  # ExperimentSummary tests
+  def test_experiment_summary_struct_fields
+    summary = Braintrust::Eval::ExperimentSummary.new(
+      project_name: "my-project",
+      experiment_name: "my-experiment",
+      experiment_id: "exp-123",
+      experiment_url: "https://example.com/exp/123",
+      scores: {},
+      metrics: {},
+      comparison: nil,
+      duration: 1.5,
+      error_count: 0,
+      errors: []
+    )
+
+    assert_equal "my-project", summary.project_name
+    assert_equal "my-experiment", summary.experiment_name
+    assert_equal "exp-123", summary.experiment_id
+    assert_equal "https://example.com/exp/123", summary.experiment_url
+    assert_equal({}, summary.scores)
+    assert_equal({}, summary.metrics)
+    assert_nil summary.comparison
+    assert_equal 1.5, summary.duration
+    assert_equal 0, summary.error_count
+    assert_equal [], summary.errors
+  end
+
+  def test_experiment_summary_from_scores
+    raw_scores = {
+      "accuracy" => [0.9, 0.8, 0.85],
+      "relevance" => [1.0, 0.5]
+    }
+    metadata = {
+      project_name: "test-project",
+      experiment_name: "test-exp",
+      experiment_id: "exp-456",
+      experiment_url: "https://example.com",
+      duration: 2.0,
+      error_count: 0,
+      errors: []
+    }
+
+    summary = Braintrust::Eval::ExperimentSummary.from_raw_scores(raw_scores, metadata)
+
+    assert_equal "test-project", summary.project_name
+    assert_equal "test-exp", summary.experiment_name
+    assert_equal 2, summary.scores.size
+    assert_in_delta 0.85, summary.scores["accuracy"].score, 0.001
+    assert_in_delta 0.75, summary.scores["relevance"].score, 0.001
+    assert_nil summary.metrics
+    assert_nil summary.comparison
+  end
+
+  def test_experiment_summary_from_scores_with_symbol_keys
+    raw_scores = {
+      accuracy: [0.9, 0.8],
+      relevance: [1.0]
+    }
+    metadata = {
+      project_name: "test",
+      experiment_name: "test",
+      experiment_id: nil,
+      experiment_url: nil,
+      duration: 1.0,
+      error_count: 0,
+      errors: []
+    }
+
+    summary = Braintrust::Eval::ExperimentSummary.from_raw_scores(raw_scores, metadata)
+
+    # Keys should be converted to strings
+    assert_equal 2, summary.scores.size
+    assert summary.scores.key?("accuracy")
+    assert summary.scores.key?("relevance")
+  end
+
+  def test_experiment_summary_from_scores_with_nil_scores
+    metadata = {
+      project_name: "test",
+      experiment_name: "test",
+      experiment_id: nil,
+      experiment_url: nil,
+      duration: 1.0,
+      error_count: 0,
+      errors: []
+    }
+
+    summary = Braintrust::Eval::ExperimentSummary.from_raw_scores(nil, metadata)
+
+    assert_equal({}, summary.scores)
+  end
+
+  def test_experiment_summary_with_comparison
+    comparison = Braintrust::Eval::ComparisonInfo.new(
+      baseline_experiment_id: "base-123",
+      baseline_experiment_name: "baseline"
+    )
+    scores = {
+      "accuracy" => Braintrust::Eval::ScoreSummary.new(
+        name: "accuracy",
+        score: 0.9,
+        diff: 0.05,
+        improvements: 2,
+        regressions: 0
+      )
+    }
+    metrics = {
+      "duration" => Braintrust::Eval::MetricSummary.new(
+        name: "duration",
+        metric: 1.5,
+        unit: "s",
+        diff: -0.1
+      )
+    }
+
+    summary = Braintrust::Eval::ExperimentSummary.new(
+      project_name: "project",
+      experiment_name: "experiment",
+      experiment_id: "exp-789",
+      experiment_url: "https://example.com",
+      scores: scores,
+      metrics: metrics,
+      comparison: comparison,
+      duration: 10.0,
+      error_count: 0,
+      errors: []
+    )
+
+    assert_equal "baseline", summary.comparison.baseline_experiment_name
+    assert_equal 1, summary.scores.size
+    assert_equal 1, summary.metrics.size
+    assert_equal 0.05, summary.scores["accuracy"].diff
+    assert_equal(-0.1, summary.metrics["duration"].diff)
+  end
+end
diff --git a/test/braintrust/eval_test.rb b/test/braintrust/eval_test.rb
index 3896464..06c9189 100644
--- a/test/braintrust/eval_test.rb
+++ b/test/braintrust/eval_test.rb
@@ -16,7 +16,7 @@ def test_eval_scorer_helper
 
   def test_eval_run_basic
     VCR.use_cassette("eval/run_basic") do
-      state = get_integration_test_state
+      rig = get_integration_test_state_with_memory_exporter
 
       task = ->(input) { input.upcase }
       scorer = Braintrust::Eval.scorer("exact") do |input, expected, output|
@@ -32,7 +32,8 @@ def test_eval_run_basic
         ],
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -45,7 +46,7 @@ def test_eval_run_basic
 
   def test_eval_run_with_task_error
     VCR.use_cassette("eval/run_task_error") do
-      state = get_integration_test_state
+      rig = get_integration_test_state_with_memory_exporter
 
       task = ->(input) {
         raise "Task failed!" if input == "bad"
@@ -65,7 +66,8 @@ def test_eval_run_with_task_error
         ],
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -77,7 +79,7 @@ def test_eval_run_with_task_error
 
   def test_eval_run_with_scorer_error
     VCR.use_cassette("eval/run_scorer_error") do
-      state = get_integration_test_state
+      rig = get_integration_test_state_with_memory_exporter
 
       task = ->(input) { input.upcase }
 
@@ -95,7 +97,8 @@ def test_eval_run_with_scorer_error
         ],
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -149,7 +152,7 @@ def test_eval_scorer_error_records_exception_event
 
   def test_eval_run_with_multiple_scorers
     VCR.use_cassette("eval/run_multiple_scorers") do
-      state = get_integration_test_state
+      rig = get_integration_test_state_with_memory_exporter
 
       task = ->(input) { input.upcase }
 
@@ -169,7 +172,8 @@ def test_eval_run_with_multiple_scorers
         ],
         task: task,
         scorers: [scorer1, scorer2],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -179,7 +183,7 @@ def test_eval_run_with_multiple_scorers
 
   def test_eval_run_with_callable_task
     VCR.use_cassette("eval/run_callable_task") do
-      state = get_integration_test_state
+      rig = get_integration_test_state_with_memory_exporter
 
       callable_task = Class.new do
         def call(input)
@@ -199,7 +203,8 @@ def call(input)
         ],
         task: callable_task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -238,7 +243,7 @@ def test_eval_run_validates_task_callable
 
   def test_eval_run_with_method_scorer
     VCR.use_cassette("eval/run_method_scorer") do
-      state = get_integration_test_state
+      rig = get_integration_test_state_with_memory_exporter
 
       task = ->(input) { input.upcase }
       # Use a lambda instead of nested method
@@ -252,7 +257,8 @@ def test_eval_run_with_method_scorer
         ],
         task: task,
         scorers: [test_method_scorer],  # Pass lambda directly
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -304,11 +310,8 @@ def test_eval_task_error_records_exception_on_task_span
 
   def test_eval_run_with_tracing
     VCR.use_cassette("eval/run_with_tracing") do
-      # Set up test rig for capturing spans (includes Braintrust processor)
-      rig = setup_otel_test_rig
-
-      # Initialize and login
-      state = get_integration_test_state
+      # Use eval test state which gives us both logged-in state and in-memory tracing
+      rig = get_integration_test_state_with_memory_exporter
 
       task = ->(input) { input.upcase }
       scorer = Braintrust::Eval.scorer("exact") { |i, e, o| (o == e) ? 1.0 : 0.0 }
@@ -319,15 +322,17 @@ def test_eval_run_with_tracing
         cases: [{input: "hello", expected: "HELLO"}],
         task: task,
         scorers: [scorer],
-        state: state,
-        tracer_provider: rig.tracer_provider,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
       assert result.success?
 
       # Verify spans were created
-      spans = rig.drain
+      # force_flush is already called by Eval.run, so we just need to get the finished spans
+      rig[:tracer_provider].force_flush
+      spans = rig[:exporter].finished_spans
 
       # Should have: 1 eval span, 1 task span, 1 score span
       assert_equal 3, spans.length
@@ -367,8 +372,8 @@ def test_eval_run_with_tracing
   # Test dataset integration: dataset as string (same project as experiment)
   def test_eval_run_with_dataset_string
     VCR.use_cassette("eval/dataset_string") do
-      state = get_integration_test_state
-      api = Braintrust::API.new(state: state)
+      rig = get_integration_test_state_with_memory_exporter
+      api = Braintrust::API.new(state: rig[:state])
 
       # Create a test dataset with records
       project_name = "ruby-sdk-test"
@@ -403,7 +408,8 @@ def test_eval_run_with_dataset_string
         dataset: dataset_name,  # String - should fetch from same project
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -417,8 +423,8 @@ def test_eval_run_with_dataset_string
   # Test dataset integration: dataset as hash with name + project
   def test_eval_run_with_dataset_hash_name_project
     VCR.use_cassette("eval/dataset_hash_name_project") do
-      state = get_integration_test_state
-      api = Braintrust::API.new(state: state)
+      rig = get_integration_test_state_with_memory_exporter
+      api = Braintrust::API.new(state: rig[:state])
 
       # Create a test dataset
       project_name = "ruby-sdk-test"
@@ -446,7 +452,8 @@ def test_eval_run_with_dataset_hash_name_project
         dataset: {name: dataset_name, project: project_name},
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -457,8 +464,8 @@ def test_eval_run_with_dataset_hash_name_project
   # Test dataset integration: dataset as hash with id
   def test_eval_run_with_dataset_hash_id
     VCR.use_cassette("eval/dataset_hash_id") do
-      state = get_integration_test_state
-      api = Braintrust::API.new(state: state)
+      rig = get_integration_test_state_with_memory_exporter
+      api = Braintrust::API.new(state: rig[:state])
 
       # Create a test dataset
       project_name = "ruby-sdk-test"
@@ -486,7 +493,8 @@ def test_eval_run_with_dataset_hash_id
         dataset: {id: dataset_id},  # By ID only
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -497,8 +505,8 @@ def test_eval_run_with_dataset_hash_id
   # Test dataset integration: dataset with limit option
   def test_eval_run_with_dataset_limit
     VCR.use_cassette("eval/dataset_limit") do
-      state = get_integration_test_state
-      api = Braintrust::API.new(state: state)
+      rig = get_integration_test_state_with_memory_exporter
+      api = Braintrust::API.new(state: rig[:state])
 
       # Create a test dataset with multiple records
       project_name = "ruby-sdk-test"
@@ -537,7 +545,8 @@ def test_eval_run_with_dataset_limit
         dataset: {name: dataset_name, project: project_name, limit: 2},
         task: task,
         scorers: [scorer],
-        state: state,
+        state: rig[:state],
+        tracer_provider: rig[:tracer_provider],
         quiet: true
       )
 
@@ -548,27 +557,26 @@ def test_eval_run_with_dataset_limit
 
   # Test dataset integration: error when both dataset and cases provided
   def test_eval_run_with_both_dataset_and_cases_errors
-    VCR.use_cassette("eval/run_both_dataset_and_cases_error") do
-      state = get_integration_test_state
-
-      task = ->(input) { input.upcase }
-      scorer = Braintrust::Eval.scorer("exact") { |i, e, o| (o == e) ? 1.0 : 0.0 }
+    # This test doesn't actually need VCR since it fails before any API calls
+    state = get_unit_test_state
 
-      # Try to provide both dataset and cases - should raise error
-      error = assert_raises(ArgumentError) do
-        Braintrust::Eval.run(
-          project: "ruby-sdk-test",
-          experiment: "test-error",
-          dataset: "some-dataset",
-          cases: [{input: "test"}],
-          task: task,
-          scorers: [scorer],
-          state: state
-        )
-      end
+    task = ->(input) { input.upcase }
+    scorer = Braintrust::Eval.scorer("exact") { |i, e, o| (o == e) ? 1.0 : 0.0 }
 
-      assert_match(/mutually exclusive/i, error.message)
+    # Try to provide both dataset and cases - should raise error
+    error = assert_raises(ArgumentError) do
+      Braintrust::Eval.run(
+        project: "ruby-sdk-test",
+        experiment: "test-error",
+        dataset: "some-dataset",
+        cases: [{input: "test"}],
+        task: task,
+        scorers: [scorer],
+        state: state
+      )
     end
+
+    assert_match(/mutually exclusive/i, error.message)
   end
 
   # ============================================
@@ -750,4 +758,41 @@ def test_eval_run_invalid_parallelism_falls_back_to_sequential
     assert result.success?
     assert_equal %w[a b], order
   end
+
+  # ============================================
+  # force_flush verification tests
+  # ============================================
+
+  def test_eval_run_calls_force_flush_before_fetching_comparison
+    VCR.use_cassette("eval/run_basic") do
+      rig = get_integration_test_state_with_memory_exporter
+      tracer_provider = rig[:tracer_provider]
+
+      # Track whether force_flush was called
+      force_flush_called = false
+      original_force_flush = tracer_provider.method(:force_flush)
+
+      # Use stub to wrap the original method and verify it's called
+      tracer_provider.stub(:force_flush, -> {
+        force_flush_called = true
+        original_force_flush.call
+      }) do
+        task = ->(input) { input.upcase }
+        scorer = Braintrust::Eval.scorer("exact") { |i, e, o| (o == e) ? 1.0 : 0.0 }
+
+        Braintrust::Eval.run(
+          project: "ruby-sdk-test",
+          experiment: "test-ruby-sdk-basic",
+          cases: [{input: "hello", expected: "HELLO"}],
+          task: task,
+          scorers: [scorer],
+          state: rig[:state],
+          tracer_provider: tracer_provider,
+          quiet: true
+        )
+      end
+
+      assert force_flush_called, "Eval.run should call force_flush on tracer_provider before fetching comparison"
+    end
+  end
 end
diff --git a/test/fixtures/vcr_cassettes/api/init.yml b/test/fixtures/vcr_cassettes/api/init.yml
new file mode 100644
index 0000000..e640191
--- /dev/null
+++ b/test/fixtures/vcr_cassettes/api/init.yml
@@ -0,0 +1,83 @@
+---
+http_interactions:
+- request:
+    method: post
+    uri: https://www.braintrust.dev/api/apikey/login
+    body:
+      encoding: UTF-8
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+      Host:
+      - www.braintrust.dev
+      Authorization:
+      - Bearer <BRAINTRUST_API_KEY>
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Access-Control-Allow-Credentials:
+      - 'true'
+      Access-Control-Allow-Headers:
+      - X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5,
+        Content-Type, Date, X-Api-Version
+      Access-Control-Allow-Methods:
+      - GET,OPTIONS,PATCH,DELETE,POST,PUT
+      Access-Control-Allow-Origin:
+      - "*"
+      Cache-Control:
+      - public, max-age=0, must-revalidate
+      Content-Length:
+      - '395'
+      Content-Security-Policy:
+      - 'script-src ''self'' ''unsafe-eval'' ''wasm-unsafe-eval'' ''strict-dynamic''
+        ''nonce-MzM2Y2Q2YTAtNTIyYS00ZTk1LTlkYTQtNjY2MWUyOWE5ZjJl''  *.js.stripe.com
+        js.stripe.com maps.googleapis.com ; style-src ''self'' ''unsafe-inline'' *.braintrust.dev
+        btcm6qilbbhv4yi1.public.blob.vercel-storage.com fonts.googleapis.com www.gstatic.com
+        d4tuoctqmanu0.cloudfront.net; font-src ''self'' data: fonts.gstatic.com btcm6qilbbhv4yi1.public.blob.vercel-storage.com
+        cdn.jsdelivr.net d4tuoctqmanu0.cloudfront.net fonts.googleapis.com mintlify-assets.b-cdn.net
+        fonts.cdnfonts.com; object-src ''none''; base-uri ''self''; form-action ''self'';
+        frame-ancestors ''self''; worker-src ''self'' blob:; report-uri https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=16;
+        report-to csp-endpoint-0'
+      Content-Type:
+      - application/json; charset=utf-8
+      Date:
+      - Thu, 11 Dec 2025 18:42:27 GMT
+      Etag:
+      - '"12n7ok4b5phaz"'
+      Reporting-Endpoints:
+      - csp-endpoint-0="https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=16"
+      Server:
+      - Vercel
+      Strict-Transport-Security:
+      - max-age=63072000
+      X-Clerk-Auth-Message:
+      - Invalid JWT form. A JWT consists of three parts separated by dots. (reason=token-invalid,
+        token-carrier=header)
+      X-Clerk-Auth-Reason:
+      - token-invalid
+      X-Clerk-Auth-Status:
+      - signed-out
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Matched-Path:
+      - "/api/apikey/login"
+      X-Nonce:
+      - MzM2Y2Q2YTAtNTIyYS00ZTk1LTlkYTQtNjY2MWUyOWE5ZjJl
+      X-Vercel-Cache:
+      - MISS
+      X-Vercel-Id:
+      - iad1::iad1::k6pms-1765478547168-26fe4b7559bd
+    body:
+      encoding: UTF-8
+      string: '{"org_info":[{"id":"5d7c97d7-fef1-4cb7-bda6-7e3756a0ca8e","name":"braintrustdata.com","api_url":"https://staging-api.braintrust.dev","git_metadata":{"fields":["commit","branch","tag","author_name","author_email","commit_message","commit_time","dirty"],"collect":"some"},"is_universal_api":true,"proxy_url":"https://staging-api.braintrust.dev","realtime_url":"wss://realtime.braintrustapi.com"}]}'
+  recorded_at: Thu, 11 Dec 2025 18:42:27 GMT
+recorded_with: VCR 6.3.1
diff --git a/test/fixtures/vcr_cassettes/eval/dataset_hash_id.yml b/test/fixtures/vcr_cassettes/eval/dataset_hash_id.yml
index 55950f0..4bf26e9 100644
--- a/test/fixtures/vcr_cassettes/eval/dataset_hash_id.yml
+++ b/test/fixtures/vcr_cassettes/eval/dataset_hash_id.yml
@@ -34,24 +34,25 @@ http_interactions:
       Cache-Control:
       - public, max-age=0, must-revalidate
       Content-Length:
-      - '257'
+      - '395'
       Content-Security-Policy:
       - 'script-src ''self'' ''unsafe-eval'' ''wasm-unsafe-eval'' ''strict-dynamic''
-        ''nonce-ZDU3OWQwMTAtYzQzZC00N2YxLWFjNzctNDkxMzkyYmM5YTEx''  *.js.stripe.com
+        ''nonce-NjE5MjkyOTYtZjMyYy00NmZhLTliYjctYzJmMjIyZjYyYzEz''  *.js.stripe.com
         js.stripe.com maps.googleapis.com ; style-src ''self'' ''unsafe-inline'' *.braintrust.dev
-        btcm6qilbbhv4yi1.public.blob.vercel-storage.com fonts.googleapis.com www.gstatic.com;
-        font-src ''self'' data: fonts.gstatic.com btcm6qilbbhv4yi1.public.blob.vercel-storage.com;
-        object-src ''none''; base-uri ''self''; form-action ''self''; frame-ancestors
-        ''self''; worker-src ''self'' blob:; report-uri https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=14;
+        btcm6qilbbhv4yi1.public.blob.vercel-storage.com fonts.googleapis.com www.gstatic.com
+        d4tuoctqmanu0.cloudfront.net; font-src ''self'' data: fonts.gstatic.com btcm6qilbbhv4yi1.public.blob.vercel-storage.com
+        cdn.jsdelivr.net d4tuoctqmanu0.cloudfront.net fonts.googleapis.com mintlify-assets.b-cdn.net
+        fonts.cdnfonts.com; object-src ''none''; base-uri ''self''; form-action ''self'';
+        frame-ancestors ''self''; worker-src ''self'' blob:; report-uri https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=16;
         report-to csp-endpoint-0'
       Content-Type:
       - application/json; charset=utf-8
       Date:
-      - Fri, 24 Oct 2025 15:29:31 GMT
+      - Thu, 11 Dec 2025 18:52:02 GMT
       Etag:
-      - '"ubzjf1iqqj75"'
+      - '"12n7ok4b5phaz"'
       Reporting-Endpoints:
-      - csp-endpoint-0="https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=14"
+      - csp-endpoint-0="https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=16"
       Server:
       - Vercel
       Strict-Transport-Security:
@@ -70,21 +71,21 @@ http_interactions:
       X-Matched-Path:
       - "/api/apikey/login"
       X-Nonce:
-      - ZDU3OWQwMTAtYzQzZC00N2YxLWFjNzctNDkxMzkyYmM5YTEx
+      - NjE5MjkyOTYtZjMyYy00NmZhLTliYjctYzJmMjIyZjYyYzEz
       X-Vercel-Cache:
       - MISS
       X-Vercel-Id:
-      - iad1::iad1::vgjfx-1761319769584-2ffc8b24e6a3
+      - iad1::iad1::rrnvl-1765479122704-46651ca8a633
     body:
       encoding: UTF-8
-      string: '{"org_info":[{"id":"5ba6d482-b475-4c66-8cd2-5815694764e3","name":"matt-test-org","api_url":"https://api.braintrust.dev","git_metadata":null,"is_universal_api":null,"proxy_url":"https://api.braintrust.dev","realtime_url":"wss://realtime.braintrustapi.com"}]}'
-  recorded_at: Fri, 24 Oct 2025 15:29:31 GMT
+      string: '{"org_info":[{"id":"5d7c97d7-fef1-4cb7-bda6-7e3756a0ca8e","name":"braintrustdata.com","api_url":"https://staging-api.braintrust.dev","git_metadata":{"fields":["commit","branch","tag","author_name","author_email","commit_message","commit_time","dirty"],"collect":"some"},"is_universal_api":true,"proxy_url":"https://staging-api.braintrust.dev","realtime_url":"wss://realtime.braintrustapi.com"}]}'
+  recorded_at: Thu, 11 Dec 2025 18:52:02 GMT
 - request:
     method: post
     uri: https://www.braintrust.dev/api/dataset/register
     body:
       encoding: UTF-8
-      string: '{"dataset_name":"test-ruby-sdk-dataset-id","org_id":"5ba6d482-b475-4c66-8cd2-5815694764e3","project_name":"ruby-sdk-test"}'
+      string: '{"dataset_name":"test-ruby-sdk-dataset-id","org_id":"5d7c97d7-fef1-4cb7-bda6-7e3756a0ca8e","project_name":"ruby-sdk-test"}'
     headers:
       Accept-Encoding:
       - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
@@ -109,21 +110,22 @@ http_interactions:
       - '551'
       Content-Security-Policy:
       - 'script-src ''self'' ''unsafe-eval'' ''wasm-unsafe-eval'' ''strict-dynamic''
-        ''nonce-ZmZmMDdjMjgtNmNkZS00MTM4LTg0MDAtYmNmNGVmZjU2NjQ0''  *.js.stripe.com
+        ''nonce-MWQyZGI2NjgtMWIzZi00MGVjLWI3MTItZjE4YzAwMzUxMTk4''  *.js.stripe.com
         js.stripe.com maps.googleapis.com ; style-src ''self'' ''unsafe-inline'' *.braintrust.dev
-        btcm6qilbbhv4yi1.public.blob.vercel-storage.com fonts.googleapis.com www.gstatic.com;
-        font-src ''self'' data: fonts.gstatic.com btcm6qilbbhv4yi1.public.blob.vercel-storage.com;
-        object-src ''none''; base-uri ''self''; form-action ''self''; frame-ancestors
-        ''self''; worker-src ''self'' blob:; report-uri https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=14;
+        btcm6qilbbhv4yi1.public.blob.vercel-storage.com fonts.googleapis.com www.gstatic.com
+        d4tuoctqmanu0.cloudfront.net; font-src ''self'' data: fonts.gstatic.com btcm6qilbbhv4yi1.public.blob.vercel-storage.com
+        cdn.jsdelivr.net d4tuoctqmanu0.cloudfront.net fonts.googleapis.com mintlify-assets.b-cdn.net
+        fonts.cdnfonts.com; object-src ''none''; base-uri ''self''; form-action ''self'';
+        frame-ancestors ''self''; worker-src ''self'' blob:; report-uri https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=16;
         report-to csp-endpoint-0'
       Content-Type:
       - application/json; charset=utf-8
       Date:
-      - Fri, 24 Oct 2025 15:29:32 GMT
+      - Thu, 11 Dec 2025 18:52:02 GMT
       Etag:
-      - '"phszpfole9fb"'
+      - '"qcf9ey5drzfb"'
       Reporting-Endpoints:
-      - csp-endpoint-0="https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=14"
+      - csp-endpoint-0="https://o4507221741076480.ingest.us.sentry.io/api/4507221754380288/security/?sentry_key=27fa5ac907cf7c6ce4a1ab2a03f805b4&sentry_environment=production&sentry_release=16"
       Server:
       - Vercel
       Strict-Transport-Security:
@@ -142,18 +144,18 @@ http_interactions:
       X-Matched-Path:
       - "/api/dataset/register"
       X-Nonce:
-      - ZmZmMDdjMjgtNmNkZS00MTM4LTg0MDAtYmNmNGVmZjU2NjQ0
+      - MWQyZGI2NjgtMWIzZi00MGVjLWI3MTItZjE4YzAwMzUxMTk4
       X-Vercel-Cache:
       - MISS
       X-Vercel-Id:
-      - iad1::iad1::p9gw7-1761319771936-769b9ea74a18
+      - iad1::iad1::hmwpf-1765479122846-ababeaa0ee74
     body:
       encoding: UTF-8
-      string: '{"project":{"id":"c532bc50-7094-4bbb-8704-42344c9728b9","org_id":"5ba6d482-b475-4c66-8cd2-5815694764e3","name":"ruby-sdk-test","created":"2025-10-22T02:53:49.779Z","deleted_at":null,"user_id":"855483c6-68f0-4df4-a147-df9b4ea32e0c","settings":null},"dataset":{"id":"f6040259-2f57-463c-ad11-5f0976480ae0","project_id":"c532bc50-7094-4bbb-8704-42344c9728b9","name":"test-ruby-sdk-dataset-id","description":null,"created":"2025-10-24T14:47:37.853Z","deleted_at":null,"user_id":"855483c6-68f0-4df4-a147-df9b4ea32e0c","metadata":null},"found_existing":true}'
-  recorded_at: Fri, 24 Oct 2025 15:29:32 GMT
+      string: '{"project":{"id":"ac86d18e-af78-4caf-918d-b89ad108ec67","org_id":"5d7c97d7-fef1-4cb7-bda6-7e3756a0ca8e","name":"ruby-sdk-test","created":"2025-10-22T03:32:12.324Z","deleted_at":null,"user_id":"f2ddc4e6-a51a-4a60-9734-9af4ea05c6ef","settings":null},"dataset":{"id":"02c8546e-38f8-46c1-8b09-df9c08854341","project_id":"ac86d18e-af78-4caf-918d-b89ad108ec67","name":"test-ruby-sdk-dataset-id","description":null,"created":"2025-12-11T18:38:01.718Z","deleted_at":null,"user_id":"c755328d-f64a-4737-a984-e83c088cd9f7","metadata":null},"found_existing":true}'
+  recorded_at: Thu, 11 Dec 2025 18:52:02 GMT
 - request:
     method: post
-    uri: https://api.braintrust.dev/v1/dataset/f6040259-2f57-463c-ad11-5f0976480ae0/insert
+    uri: https://staging-api.braintrust.dev/v1/dataset/02c8546e-38f8-46c1-8b09-df9c08854341/insert
     body:
       encoding: UTF-8
       string: '{"events":[{"input":"test","expected":"TEST"}]}'
@@ -165,7 +167,7 @@ http_interactions:
       User-Agent:
       - Ruby
       Host:
-      - api.braintrust.dev
+      - staging-api.braintrust.dev
       Content-Type:
       - application/json
       Authorization:
@@ -182,43 +184,43 @@ http_interactions:
       Connection:
       - keep-alive
       X-Amz-Cf-Pop:
-      - JFK50-P2
-      - JFK50-P5
+      - JFK50-P10
+      - JFK52-P8
       Date:
-      - Fri, 24 Oct 2025 15:29:32 GMT
+      - Thu, 11 Dec 2025 18:52:03 GMT
       Access-Control-Allow-Credentials:
       - 'true'
       X-Amzn-Requestid:
-      - 3800ff4e-76c3-4db9-ba76-b1dfac848b52
+      - df0f0065-51b0-458f-bcfd-74cced11a2f4
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+      - 693b12d3000000006bc905a9b4330aaf
       X-Amz-Apigw-Id:
-      - S9U2eEN_IAMEURw=
+      - Vb_hBFC4oAMEdOQ=
       Vary:
       - Origin, Accept-Encoding
       Etag:
-      - W/"34-kpTdz8lS672FvIsIVFHZ8Z75loI"
+      - W/"34-8JSSpoW7pcILZAQfop1UIyGR6/U"
       Access-Control-Expose-Headers:
       - x-bt-cursor,x-bt-found-existing,x-bt-query-plan
       X-Amzn-Trace-Id:
-      - Root=1-68fb9b5c-001111f77272d9132d153b73;Parent=46b22aeb9d81f6e3;Sampled=0;Lineage=1:24be3d11:0
+      - Root=1-693b12d2-40df3ad046f9aecd1251f81f;Parent=01d3102cc6f6688f;Sampled=0;Lineage=1:fc3b4ff1:0
       Via:
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+      - 1.1 3bd704a723998d21cd3d1c7e5aa5b320.cloudfront.net (CloudFront), 1.1 06b7f1d77ee52f2e46654588c01fafb0.cloudfront.net
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       X-Cache:
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       X-Amz-Cf-Id:
-      - QEXg_Jf2pT3XKOlRi2HB04ROe093kcGpWh_Fbaitn7ngDXjZvFR_Jg==
+      - CFrug_dypMrUJzc_F8iCB5plikTD255ua-Xvxh_HEAcWlJK1g9VG2Q==
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-      string: '{"row_ids":["5dcd0c01-13dd-4bd6-842f-5478c963d4d2"]}'
-  recorded_at: Fri, 24 Oct 2025 15:29:32 GMT
+      string: '{"row_ids":["eef9aa47-378d-4752-9f8c-72f8021ee763"]}'
+  recorded_at: Thu, 11 Dec 2025 18:52:03 GMT
 - request:
     method: post
-    uri: https://api.braintrust.dev/btql
+    uri: https://staging-api.braintrust.dev/btql
     body:
       encoding: UTF-8
-      string: '{"query":{"from":{"op":"function","name":{"op":"ident","name":["dataset"]},"args":[{"op":"literal","value":"f6040259-2f57-463c-ad11-5f0976480ae0"}]},"select":[{"op":"star"}],"limit":1000},"fmt":"jsonl"}'
+      string: '{"query":{"from":{"op":"function","name":{"op":"ident","name":["dataset"]},"args":[{"op":"literal","value":"02c8546e-38f8-46c1-8b09-df9c08854341"}]},"select":[{"op":"star"}],"limit":1000},"fmt":"jsonl"}'
     headers:
       Accept-Encoding:
       - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
@@ -227,7 +229,7 @@ http_interactions:
       User-Agent:
       - Ruby
       Host:
-      - api.braintrust.dev
+      - staging-api.braintrust.dev
       Content-Type:
       - application/json
       Authorization:
@@ -240,54 +242,51 @@ http_interactions:
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       - application/json
       Content-Length:
-      - '3185'
+      - '2332'
       Connection:
       - keep-alive
       X-Amz-Cf-Pop:
-      - JFK50-P2
-      - JFK50-P5
+      - JFK50-P10
+      - JFK52-P8
       Date:
-      - Fri, 24 Oct 2025 15:29:32 GMT
+      - Thu, 11 Dec 2025 18:52:03 GMT
       Access-Control-Allow-Credentials:
       - 'true'
       X-Amzn-Requestid:
-      - a6e021fa-d559-4505-ba77-0ffbc96bcff5
+      - 839fbc96-c832-49be-8899-45e4b5af1a78
       X-Bt-Internal-Trace-Id:
-      - 68fb9b5c0000000052c56f9dddfb5706
+      - 693b12d30000000065e73d826870341c
       X-Amz-Apigw-Id:
-      - S9U2hFzOoAMEHzA=
+      - Vb_hIHLcIAMEOPg=
       Vary:
       - Origin
       Access-Control-Expose-Headers:
       - x-bt-cursor,x-bt-found-existing,x-bt-query-plan
       X-Amzn-Trace-Id:
-      - Root=1-68fb9b5c-0cbcfbc5668735d17956d33b;Parent=668dcfa397621f76;Sampled=0;Lineage=1:24be3d11:0
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       X-Bt-Cursor:
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         (CloudFront)
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+      - lhYl9xyrZM5DIwNgJ8dVgjdUxsM56uf2tSohuQ7OM6lqML9_RfyVHA==
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@@ -504,7 +492,7 @@ http_interactions:
       User-Agent:
       - Ruby
       Host:
-      - api.braintrust.dev
+      - staging-api.braintrust.dev
       Content-Type:
       - application/json
       Authorization:
@@ -521,70 +509,117 @@ http_interactions:
       Connection:
       - keep-alive
       Date:
-      - Fri, 24 Oct 2025 15:09:43 GMT
+      - Thu, 11 Dec 2025 19:12:12 GMT
       X-Bt-Used-Endpoint:
-      - OPENAI_API_KEY
+      - AZURE_DEFAULT_CREDENTIALS
       X-Amzn-Requestid:
-      - 9c00aa95-d935-42a5-8ac1-a7dc600f90f3
-      Cf-Ray:
-      - 9939e4120e29827b-IAD
+      - c430d6fe-6c08-43e3-a8fd-0d1332f1d07c
+      X-Ms-Deployment-Name:
+      - gpt-4o-mini
       X-Ratelimit-Remaining-Requests:
-      - '29999'
-      Openai-Processing-Ms:
-      - '1292'
-      Cf-Cache-Status:
-      - DYNAMIC
+      - '2498'
+      X-Ms-Region:
+      - East US
+      X-Ms-Rai-Invoked:
+      - 'true'
       Strict-Transport-Security:
       - max-age=31536000; includeSubDomains; preload
       X-Bt-Cached:
       - HIT
-      X-Openai-Proxy-Wasm:
-      - v0.1
-      X-Ratelimit-Reset-Requests:
-      - 2ms
-      X-Envoy-Upstream-Service-Time:
-      - '1356'
-      Openai-Organization:
-      - braintrust-data
       X-Request-Id:
-      - req_3b4cbed806f74c87a3271f5c6a604e5e
-      Set-Cookie:
-      - _cfuvid=bnvjD_AxaE5R4fbzu0ZeunODOvUneRBfGsQ4qqV2PNs-1761313279181-0.0.1.1-604800000;
-        path=/; domain=.api.openai.com; HttpOnly; Secure; SameSite=None
+      - 87a051ba-805d-48c9-9f08-65f3b6989fed
       Cache-Control:
       - max-age=604800
+      Azureml-Model-Session:
+      - d20251210231011-628f6c5d8b8c414b
+      Apim-Request-Id:
+      - 02c95985-2b21-4561-b4d7-e39fcca0de46
       X-Ratelimit-Limit-Tokens:
-      - '150000000'
+      - '250000'
       X-Content-Type-Options:
       - nosniff
       X-Ratelimit-Remaining-Tokens:
-      - '149999965'
+      - '249932'
       X-Bt-Function-Creds-Cached:
       - HIT
       X-Amzn-Trace-Id:
-      - Root=1-68fb96b7-4a895e6c79fef3070bc35e38;Parent=38a2dbefe6ae1b3c;Sampled=0;Lineage=1:8be8f50d:0
+      - Root=1-693b178c-1b9f8b240201b3ef2a754551;Parent=7a32d4cc0567b4ae;Sampled=0;Lineage=1:98839c8e:0
       X-Bt-Function-Meta-Cached:
       - HIT
-      X-Ratelimit-Reset-Tokens:
-      - 0s
-      Openai-Version:
-      - '2020-10-01'
       X-Ratelimit-Limit-Requests:
-      - '30000'
-      Openai-Project:
-      - proj_wMRY6YpEiASXMxPIIcI9nQRi
+      - '2500'
       X-Cache:
       - Miss from cloudfront
       Via:
-      - 1.1 d4b67fda8355378cec4afc079701f8e6.cloudfront.net (CloudFront)
+      - 1.1 e313693179ab4339368ba93edb851532.cloudfront.net (CloudFront)
       X-Amz-Cf-Pop:
-      - JFK50-P2
+      - JFK52-P8
       X-Amz-Cf-Id:
-      - WncpHoCD1o_fpgbl1SYCSIhiFzNaFFEbWaQfnmqOO9P3DAiYiatXfA==
+      - y5WHHtl4sunQ-zwfqP8SYI9krNN8by3-eeGZc16ys1Y612wmdByeiA==
       Age:
-      - '5303'
+      - '2033'
     body:
       encoding: UTF-8
       string: '"correct"'
-  recorded_at: Fri, 24 Oct 2025 15:09:43 GMT
+  recorded_at: Thu, 11 Dec 2025 19:12:12 GMT
+- request:
+    method: get
+    uri: https://staging-api.braintrust.dev/experiment-comparison2?experiment_id=902f477a-efb9-4f5b-a94e-057943d787cc
+    body:
+      encoding: US-ASCII
+      string: ''
+    headers:
+      Accept-Encoding:
+      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
+      Accept:
+      - "*/*"
+      User-Agent:
+      - Ruby
+      Host:
+      - staging-api.braintrust.dev
+      Authorization:
+      - Bearer <BRAINTRUST_API_KEY>
+  response:
+    status:
+      code: 200
+      message: OK
+    headers:
+      Content-Type:
+      - application/json; charset=utf-8
+      Content-Length:
+      - '26'
+      Connection:
+      - keep-alive
+      X-Amz-Cf-Pop:
+      - JFK50-P10
+      - JFK52-P8
+      Date:
+      - Thu, 11 Dec 2025 19:12:13 GMT
+      Access-Control-Allow-Credentials:
+      - 'true'
+      X-Amzn-Requestid:
+      - b3d8ac6f-c77e-4f8a-8b5b-9ea8bf38d2be
+      X-Bt-Internal-Trace-Id:
+      - 693b178d000000005a3ca3016c2a683a
+      X-Amz-Apigw-Id:
+      - VcCeGEY2oAMEdhQ=
+      Vary:
+      - Origin, Accept-Encoding
+      Etag:
+      - W/"1a-DVqVcAQOxg1HFdcjY89JEuayOGw"
+      Access-Control-Expose-Headers:
+      - x-bt-cursor,x-bt-found-existing,x-bt-query-plan
+      X-Amzn-Trace-Id:
+      - Root=1-693b178d-1a37b89555deada239ee7eb5;Parent=0c6904676fcd20a1;Sampled=0;Lineage=1:fc3b4ff1:0
+      Via:
+      - 1.1 7d77965d78b3f4565239009cf6e62356.cloudfront.net (CloudFront), 1.1 1600051e9ac5d9cd9f5329cf4d5a06f8.cloudfront.net
+        (CloudFront)
+      X-Cache:
+      - Miss from cloudfront
+      X-Amz-Cf-Id:
+      - 9jWjk_RKq65JaOsOEr8nCN-B_plwCS2sDzp7rPsW730DU8XSH3rR0A==
+    body:
+      encoding: ASCII-8BIT
+      string: '{"scores":{},"metrics":{}}'
+  recorded_at: Thu, 11 Dec 2025 19:12:13 GMT
 recorded_with: VCR 6.3.1
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 73fcc23..c8998db 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -192,6 +192,33 @@ def get_openai_key
   def get_anthropic_key
     ENV["ANTHROPIC_API_KEY"] || "sk-ant-test-key-for-vcr"
   end
+
+  # Creates a State for integration tests with in-memory exporter
+  # This performs login (via VCR cassettes) but uses an in-memory span exporter
+  # instead of OTLP, so force_flush doesn't cause timeouts in tests.
+  # Use this for tests that need API access AND tracing with fast flush.
+  # @param options [Hash] Options to pass to Braintrust.init
+  # @return [Hash] { state:, tracer_provider:, exporter: }
+  def get_integration_test_state_with_memory_exporter(**options)
+    require "opentelemetry/sdk"
+
+    # Create in-memory exporter (no HTTP calls, instant flush)
+    exporter = OpenTelemetry::SDK::Trace::Export::InMemorySpanExporter.new
+
+    # Create a new TracerProvider for this test
+    tracer_provider = OpenTelemetry::SDK::Trace::TracerProvider.new
+
+    # Initialize state with in-memory exporter
+    state = Braintrust.init(
+      set_global: false,
+      blocking_login: true,
+      tracer_provider: tracer_provider,
+      exporter: exporter,
+      **options
+    )
+
+    {state: state, tracer_provider: tracer_provider, exporter: exporter}
+  end
 end
 
 # Include helper in all test cases