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November 14, 2025 · Anthropic

Structured outputs in beta for Claude Sonnet 4.5 and Claude Opus 4.1

  • We’ve launched structured outputs in beta, providing guaranteed schema conformance for Claude’s responses. Use JSON outputs for structured data responses or strict tool use for validated tool inputs. Available for Claude Sonnet 4.5 and Claude Opus 4.1. To enable, use the beta header structured-outputs-2025-11-13.
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Announcements from AWS, Google Cloud, Azure, Cloudflare and the main AI providers in one searchable changelog, with daily, weekly and monthly digests.

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