Glossary

Structured output — Glossary

Constraining model responses to schemas such as JSON for reliable downstream parsing.

Also known as: JSON mode

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Full definition

Structured outputs reduce brittle string parsing. Combine schema guidance with validation and low temperature. Function calling is a closely related pattern for tool arguments.

Related encyclopedia topic

Function Calling — Function calling is the API pattern where models return structured arguments for developer-defined functions, enabling reliable tool use from LLMs.

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