The only really capable models are from OpenAI, Anthropic, and Meta. They all have guard rails of some kind and you need to use a supervisor agent to decide if the output is as you wanted if you can't use something more basic like a JSON parser. Google Bard/Gemini output is not that high quality IMO.
I have a guardrails ensuring proper json output that works 99% of the time except chatgpt has been so lobotomised that it ignores that for the I can't answer that default responces. What about mistral models I've played with then but haven't found any services that let me just point at an api and fire.
Idk about as powerful as gpt 4, but openrouter.ai has a ton of open source models you can use, including gpt 4.
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