Update app.py

app.py

@@ -35,7 +35,7 @@ def get_ai_response(prompt, level):
     
     try:
         response = openai.ChatCompletion.create(
-            model="gpt-4-turbo-preview",
+            model="gpt-4o-mini",
             messages=[
                 {"role": "system", "content": system_prompt},
                 {"role": "user", "content": f"Story so far: {prompt}\n\nProvide response in JSON format."}