Changelog changedcowork/changelog
Nearest release: v2.1.284, published 3 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 28 Sep 2026 20:37 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 28 Sep 2026 21:07 UTC.
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First seen
14 Aug 2026
this site's first read of the page
Recorded edits41to this page, all time
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88 **General**
99
10 * Added support for Claude Sonnet 5.5.
1011 * Fixed sessions failing on every message with an API error caused by certain web search results or earlier extended thinking in the conversation's history.
1112
1213 **Code**
No line in this hunk matches that.