Structured outputs beta now live for Claude API Sonnet 4.5 and Opus 4.1
Structured outputs are now available in public beta for Sonnet 4.5 and Opus 4.1 on the Claude Developer Platform API. This feature lets developers ensure API responses match specified JSON schemas or tool definitions, reducing parsing errors and failed tool calls. Support for Haiku 4.5 is planned soon.
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External links
- Structured outputs are now available on the Claude Developer Platform (API).Claude on X • Official source
- Structured outputs on the Claude Developer PlatformClaude Blog • Official source
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