Update app.py

app.py

@@ -144,7 +144,7 @@ If you can't answer something, call `record_unknown_question`. If a user seems i
         self.session_log.append({"role": "user", "content": message})
 
         response = self.openai.chat.completions.create(
-            model="gpt-4o",
+            model="gpt-4o-mini",
             messages=messages,
             tools=tools,
             stream=False
@@ -162,7 +162,7 @@ If you can't answer something, call `record_unknown_question`. If a user seems i
             yield follow_up
         else:
             stream = self.openai.chat.completions.create(
-                model="gpt-4o",
+                model="gpt-4o-mini",
                 messages=messages,
                 tools=tools,
                 stream=True