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Claude API 2026-10-21: What Breaks and How to Upgrade

This story is from 2026-10-22. It is preserved in the archive; the latest stories are on the live feed.

Short answer: Anthropic released API version 2026-10-21 on October 21, 2026. Requests on the new version that send temperature , top_p or top_k , a document in an assistant message, or citations in a user message return 400. New SDK majors send the new version by default and pass your key as Author…

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  1. 2026-10-22 08:04 · DEV Community — AI
    Claude API 2026-10-21: What Breaks and How to Upgrade

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