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On October 21, 2026, Anthropic released a new SDK and ant CLI, defaulting to API version 2026-10-21. According to Claude Devs, this is the first official version release since 2023, and the 2023-06-01 version has not been deprecated. This version removes temperature, top_p, and top_k from the Messages API; documents in assistant turns and citations in user turns will return 400; and it replaces some deprecated Admin and Enterprise Analytics API fields. Developers can use the /claude-api skill in Claude Code to complete the update, or modify items one by one according to the migration guide. There are currently no subsequent developments.
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Anthropic releases new SDK and ant CLI, default API version 2026-10-21Developments
1 confirmed developments
- Source:Claude Devs
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Oct 22
Claude DevsFirst-party
Anthropic releases new SDK and ant CLI, default API version 2026-10-21
Anthropic has released a new SDK and ant CLI that default to API version 2026-10-21. This is the first formal version release since 2023, and version 2023-06-01 has not been deprecated. This version removes temperature, top_p, and top_k from the Messages API; documents in assistant turns and citations in user turns will return 400; and it replaces some deprecated Admin and Enterprise Analytics API fields. Developers can use the /claude-api skill in Claude Code to complete the update, or modify items one by one according to the migration guide.