Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Timeline

1. Sep 11, 2026, 2:37 PM UTC

   The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC

2. Sep 11, 2026, 2:28 PM UTC

   A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

3. Sep 11, 2026, 2:28 PM UTC

   A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.

4. Sep 11, 2026, 2:21 PM UTC

   We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible.

5. Sep 11, 2026, 2:19 PM UTC

   We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible.