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Anthropic · Release notesSource update

Substantive changesRecordedObservation date 2026-10-24(day precision)Revision r2

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Summary

Claude Fable 5.1 releases, Managed Agents beta, Structured outputs support for Haiku 4.5, 1 hourly caching without beta headers, Sonnet 5 pricing normalization, and other updates are introduced; additionally, the old beta status description is removed, and the corresponding feature is normalized.

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Source page

https://docs.anthropic.com/en/release-notes/api ↗

This link points to the source's official page (not content on this site).