Gemini 2.0 Flash *forcing* JSON responses to start with ```json?

Gemini API
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1

I used to have prompt to generate a JSON response that worked great. Now the model forces the response to start with json, no matter what I prompt it with. I can't just sanitize the response as it contains markdown; when code is returned the are truncating the output (as the model thinks that these are closing on the initialjson).
Did something change in last 2 weeks or so? Why is 2.0 so bad at following this kind of instructions? Thanks

3

Hi @Paolo ,

Thanks for raising the issue with us. I have tried using Google AI Studio to generate the JSON data with the gemini-2.0 flash model, and it seems to be generating the correct JSON response without any starting or ending quotes or strings. Please find the attached image for your reference

image
image2464×1012 215 KB

Let me know if it helps. Thank You!!