Anthropic incident
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
Started
September 11, 2026 at 02:19 PM UTC
Duration
17 min
Resolved
September 11, 2026 at 02:37 PM UTC
Updates timeline
- Investigating
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
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
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
- Monitoring
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
- Resolved
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
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