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Anthropic · Release notesSource update

Substantive changesRecordedObservation date 2026-10-11(day precision)Revision r2

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Summary

Updated the release notes for Claude Fable 5 and Claude Mythos 5, emphasizing that adaptive thinking is the only thinking mode, and added a feature for Compliance API to support downloading Word documentation, corresponding overall to the release of the new model and the extension of API features.

LLM generation

LLM The summary is machine-generated; please refer to the original text for important information.

Source page

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

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