Bollcoin, October 22 — According to ClaudeDevs, Anthropic has launched Claude API version 2026-10-21, the first official version since 2023. The new version removes the temperature, top_p, and top_k parameters from the Messages API. Passing documents in an assistant turn, or citations in a user turn, will return a 400 error. Some deprecated Admin and Enterprise Analytics API fields have also been replaced.