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Anthropic · Release notesSource update

Substantive changesRecordedObservation date 2026-09-10(day precision)Revision r3

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Summary

Added information regarding the Per-message effort parameter (beta) being applicable to Google Cloud, Claude Fable 5.1, Claude Mythos 5.1, and Claude Opus 5, indicating that this feature has been extended to more models and cloud platforms.

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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