Update app.py

app.py

@@ -109,7 +109,7 @@ excluding the title, author name, source information, chapter number, annotation
 """
 
     resp = client.chat.completions.create(
-        model="openai/o4-mini",
+        model="google/gemini-2.5-flash",
         messages=[{"role": "user", "content": prompt}],
         temperature=0.4,
         max_tokens=5000