Structured outputs help you get predictable JSON from models. The Gateway passes structured-output settings through to providers that support them.
Where to use it
Structured outputs are commonly used with /v1/responses and /v1/chat/completions. Some providers also expose schema enforcement on /v1/messages.
Check the API Reference for the supported request fields and response formats.
Best practices
- Keep schemas small and explicit.
- Validate responses on the server before trusting them.
- Combine structured outputs with tool calling for reliable workflows.
Last modified on February 11, 2026
