Update app.py

app.py

@@ -236,7 +236,7 @@ def generate_khan_answer(query: str, search_results: List[Dict], client: OpenAI)
     try:
         logger.info("Calling OpenAI API...")
         completion = client.chat.completions.create(
-            model="gpt-4o", # Use gpt-4 if available and preferred
+            model="gpt-4o-mini", # Use gpt-4 if available and preferred
             messages=[
                 {"role": "system", "content": system_prompt},
                 {"role": "user", "content": user_message}