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Claude API version 2026-10-21 released by Anthropic

claudedevs@claudedevs
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Why we picked it

A three-year gap between API versions meant developers often absorbed breaking changes tied to model upgrades with no versioned migration path. More frequent version pins make it easier to test changes in a controlled window before updating. Teams pinning the 2023-06-01 version can stay on it for now, since Anthropic confirmed it remains supported.

Anthropic has released Claude API version 2026-10-21, its first official version release since 2023-06-01. The company said the Claude API has evolved considerably in that period and plans to ship version releases more frequently going forward. The new versioning cadence is intended to let developers handle breaking changes before a new model requires them. The existing 2023-06-01 version has not been deprecated.

Original · claudedevs

API version 2026-10-21 is now available.

The Claude API has evolved a lot, but this is our first official version release since 2023. We plan to release versions more often so you can handle breaking changes before a new model requires them.

2023-06-01 is not deprecated.

  • Claude Code: GitHub Releases10-19 21:34原文
  • AWS Machine Learning Blog10-19 23:32原文
  • Ethan Mollick10-19 23:58原文
  • thsottiaux10-20 17:10原文
  • Decoder10-21 08:37原文
  • rohanpaul_ai10-21 18:49原文
  • Yuchen Jin10-21 19:11原文
  • TestingCatalog10-21 19:15原文
  • kimmonismus10-21 19:47原文
  • theverge10-21 19:53原文
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