Does claude sonnet not have support for json mode?

Question

Does claude sonnet not have support for json mode in portkey?https://docs.anthropic.com/en/docs/test-and-evaluate/strengthen-guardrails/increase-consistency

Griphook | Portkey · Answer

these examples are for prompt based constraints right? this should work without any changes, what am I missing?

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Does claude sonnet not have support for json mode?