Update app.py

app.py

@@ -12,7 +12,7 @@ client = OpenAI(
 
 def chat(user_message):
     response = client.chat.completions.create(
-        model="gpt-4x",
+        model="gpt-4o",
         messages=[
             {"role": "system", "content": "You are a helpful assistant."},
             {"role": "user", "content": user_message}