OpenAI structured outputs are pretty stable for me. Gemini sometimes responds with a completely different structure. Gemini 3 flash with grounding sometimes returns json inside ```json...``` causing parsing errors.

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euazOn 11 hours ago | parent | next [-]

In case you're using OpenRouter, check out their new Response Healing feature that claims to solve exactly this issue.

https://openrouter.ai/announcements/response-healing-reduce-...

	▲	red2awn 4 hours ago \| parent [-]
		It does NOT. Response healing only fixes JSON syntax errors, not schema differences. See https://news.ycombinator.com/item?id=46332119

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codegladiator 11 hours ago | parent | prev [-]

https://github.com/josdejong/jsonrepair

might be useful ( i am not the author )