CATCH #2225
DETECTED OCT 21, 2026 18:25 UTC
THE CATCHscore 5/10
EXHIBIT 2225
Oct 21, 2026 18:25 UTC
docs
https://platform.claude.com/docs/en/release-notes/api
Anthropic updated its API changelog, adding details about a new API version (2026-10-21) and corresponding client SDK/CLI updates with breaking changes and license changes.
READY TO POST:
anthropic just updated their docs for a new api version: 2026-10-21. new client sdks and cli are out too, with breaking changes and a license switch to apache 2.0.
looks like anthropic shipped a new api version, 2026-10-21, alongside updated sdks for python, typescript, c#, go, java, php, and ruby. heads up on those breaking changes!
EVIDENCE — the receipts
Anthropic API changelog changed: https://platform.claude.com/docs/en/release-notes/api
24 added lines
---
+++
@@ -30,2 +30,3 @@
Migrating to Managed Agents
+Migrating to API version 2026-10-21
@@ -53,2 +54,24 @@
repository.
+October 21, 2026
+
+We've released API version
+2026-10-21
+.
+Migrating to API version 2026-10-21
+shows how to upgrade.
+We've released new versions of the
+client SDKs
+and the
+ant
+CLI
+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
+.
+The new SDK and CLI versions also have breaking changes that don't depend on the API version, and they are licensed under Apache 2.0 instead of the MIT License. See
+SDK and CLI changes
+.
October 20, 2026
@@ -2771,2 +2794,3 @@
+October 21, 2026
October 20, 2026
caught by the 20-minute sweep ·
the live wire · all receipts