Structured Output

Structured output is the practice of constraining a model's generation to conform to a defined schema — such as JSON, XML, or a typed Pydantic model — rather than producing free-form text. It eliminates brittle text parsing and makes downstream processing deterministic. Structured output can be achieved through schema-guided decoding at the logit level, careful prompting, or a combination of both, and it is widely used for tool arguments, API responses, and data extraction.