OpenAI. Walks through `strict: true`, the difference from old JSON mode, refusal handling, and how function calling and response-format schemas compose. Useful precisely because it describes the contract the API gives you, which is what the article's production patterns are built on top of.
Just under our view bar but canonical — the team that shipped strict mode describing the API contract the article's production patterns are built on.
You can explain what strict mode guarantees, how it differs from old JSON mode, and how refusal handling fits the structured-output contract.
Working knowledge of function calling and JSON Schema basics.
Last reviewed: May 18, 2026
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