Anthropic incident
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
Resolved after 17 minutes, affecting claude.ai and Claude API (api.anthropic.com) and 1 more, on September 11, 2026.
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
Affected components
Update timeline
- investigating Sep 11, 2026, 02:19 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.
- identified Sep 11, 2026, 02:21 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.
- monitoring Sep 11, 2026, 02:28 PM UTC
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
- monitoring Sep 11, 2026, 02:28 PM UTC
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
- resolved Sep 11, 2026, 02:37 PM UTC
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
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