Update app.py

app.py

@@ -104,7 +104,7 @@ def ask_llm(channel, user_message):
 
     try:
         response = openai_client.chat.completions.create(
-            model="gpt-5-nano-2025-08-07",
+            model="gpt-4o",
             messages=[{"role": "system", "content": SYSTEM_PROMPT}] + history,
             temperature=0.4,
             max_tokens=600,