Observed source change · Anthropic

Claude release notes documentation changed

Published documentation; runtime behavior and legal interpretation not established.

Last unchanged check: 2026-10-21T16:45:12Z
First changed check: 2026-10-21T18:50:12Z

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After

### October 21, 2026 * We've released API version `2026-10-21`. [Migrating to API version 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21) shows how to upgrade. * We've released new versions of the [client SDKs](https://platform.claude.com/docs/en/cli-sdks-libraries/overview) and the [`ant` CLI](https://platform.claude.com/docs/en/cli-sdks-libraries/cli/quickstart) that send API version `2026-10-21` by default: Python SDK 2.0.0, TypeScript SDK 1.0.0, C# SDK 13.0.0, Go SDK 2.0.0, Java SDK 3.0.0, PHP SDK 1.0.0, Ruby SDK 2.0.0, and `ant` CLI 2.0.0. See [Switch to 2026-10-21](https://platform.claude.com/docs/en/api/migration-2026-10-21#upgrade). * The new SDK and CLI versions also have breaking changes that don't depend on the API version, and they are licensed …

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