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Anthropic · Release notesSource update

Substantive changesRecordedObservation date 2026-09-16(day precision)Revision r4

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Summary

New Messages API dialogue compression function (beta) has been added, requiring a specific beta header and falls under API capability extension.

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 ↗

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