CLAUDE API VERSION 2026-10-21 IS NOW AVAILABLE

Summary from the TLDR AI newsletter

The Claude API has received its first official version release since 2023. Anthropic plans to release versions more often so developers can handle breaking changes before a new model requires them. 2023-06-10 is not deprecated. New major versions of the Anthropic SDKs and CLI are out today and default to the new API. A migration guide is available.