Anthropic releases API version 2026-10-21
10/22/2026 — 10/24, 13:23·1 sources (all)·1 reports (all)
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- Anthropic released API version 2026-10-21, the first new version since 2023-06-01. Requests carrying temperature, top_p or top_k, requests p…
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Anthropic released API version 2026-10-21 on October 21, its first new version since 2023-06-01, according to a DEV Community write-up. Requests sending temperature, top_p or top_k on the new version return 400, as do documents in assistant messages and citations in user messages. Eight official SDKs and the CLI shipped new majors that default to the new version and move to Apache 2.0; older pinned requests keep working.
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