No need in defaults for model as well

The models come and go,  it is the client's responsibility to stay updated.

P.S.
We could ensure that the model is specified, but what's the point?
The server returns an error without needing assistance from the library."

Author: johnd0e

openai/init.moon

@@ -264,8 +264,6 @@ class OpenAI
     assert test_messages messages
 
     payload = {
-      model: "gpt-3.5-turbo"
-      -- temperature: 1
       :messages
     }
 
@@ -282,13 +280,7 @@ class OpenAI
   -- opts: additional parameters as described in https://platform.openai.com/docs/api-reference/completions
   completion: (prompt, opts) =>
     payload = {
-      model: "text-davinci-003"
       :prompt
-      -- temperature: 1
-      -- max_tokens: 16
-      -- top_p: 1
-      -- frequency_penalty: 0
-      -- presence_penalty: 0
     }
 
     if opts