Structured outputs

The model’s answer is constrained to match a JSON schema you provide.

Instead of asking for JSON and hoping, you pass a schema and the API guarantees the shape. Your code can parse it without regex and fragile retries. The content can still be wrong; only the format is guaranteed.

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Related terms

Tool use (function calling): The model returns a structured request to run a function you defined; your code runs it.
Evals: A repeatable test set that scores an AI feature, so changes can be measured instead of guessed.

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