Update app.py

app.py

@@ -24,7 +24,7 @@ you base your script on."""
 @retry(stop=stop_after_attempt(3), wait=wait_fixed(1))
 def call_openai_api(messages):
     return openai.ChatCompletion.create(
-        model="gpt-3.5-turbo",
+        model="gpt-4",
         messages=messages
     )