Update app.py

app.py

@@ -450,7 +450,7 @@ Consider: minor spacing differences are OK, but wrong particles or wrong verb en
 Reply with ONLY valid JSON: {{"correct": true}} or {{"correct": false, "reason": "explanation"}}"""
 
         response = client.models.generate_content(
-            model="gemini-2.0-flash",
+            model="gemini-2.5-flash",
             contents=prompt,
         )
         result = json.loads(response.text.strip())
@@ -857,7 +857,7 @@ Be lenient with stroke variation but strict about the actual characters.
 Return JSON with: correct (bool), detected_text (what you read), feedback (brief comment)."""
 
         response = client.models.generate_content(
-            model="gemini-2.0-flash",
+            model="gemini-2.5-flash",
             contents=[prompt, types.Part.from_bytes(data=img_bytes, mime_type="image/jpeg")],
             config=types.GenerateContentConfig(
                 response_mime_type="application/json",