廃止されたモデルを現行のものに変更 (#8) (#9)

Reviewed-on: #9

talk.py

@@ -266,10 +266,7 @@ class Talk:
 
         try:
             return (openai.chat.completions.create (
-                        model    = ('gpt-4o'
-                                    if any (type (e['content']) is list
-                                            for e in messages)
-                                    else 'gpt-3.5-turbo'),
+                        model    = 'gpt-6-luna',
                         messages = messages)
                     .choices[0].message)
         except: