Update app.py

app.py

@@ -68,7 +68,7 @@ def respond(message, history):
 
     try:
         response = client.chat.completions.create(
-            model="grok-4-fast-non-reasoning",
+            model="gpt-5-mini",
             messages=messages
         )
         bot_message = response.choices[0].message.content