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Not the original commenter but I’ve done this too with Pydantic AI (actually the library does it for you). See “Streaming Structured Output” here https://ai.pydantic.dev/output/#streaming-structured-output

Thanks yes! Im aware of structured outputs, llama.cpp has also great support with GBNF and several languages beyond json.

I've been trying to create go/rust ones but its way harder than just json due to all the context/state they carry over