Update backend/app/services/vlm_service.py

backend/app/services/vlm_service.py

@@ -162,7 +162,7 @@ Be exhaustive and literal. Do not use words like 'suggests', 'implies', 'appears
 Only state what is directly visible or audible. Write in plain paragraphs."""
 
         response = client.models.generate_content(
-            model="gemini-pro-latest",
+            model="gemini-3.1-flash-lite-preview",
             contents=[uploaded_file, prompt]
         )