Update app.py

app.py

@@ -72,7 +72,7 @@ def generate_questions_with_retry(knowledge_material, question_type, cognitive_l
         try:
             # Use the new method `ChatCompletion.create`
             response = openai.ChatCompletion.create(
-                model="gpt-3.5-turbo",  # You can use "gpt-4" if available
+                model="GPT-4o mini",  # You can use "gpt-4" if available
                 messages=[
                     {"role": "system", "content": "You are a helpful assistant for generating exam questions."},
                     {"role": "user", "content": prompt}