Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Event timeline

How this incident unfolded, from the official status page.

1. Investigating

   about 1 month ago

   Anthropic

   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.

2. Identified

   about 1 month ago

   Anthropic

   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.

3. Monitoring

   about 1 month ago

   Anthropic

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

4. Monitoring

   about 1 month ago

   Anthropic

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

5. Resolved

   about 1 month ago

   Anthropic

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