Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
- Incident ID
- #0bdc17d1
- Impact
- major
- Components
- anthropic
Updates
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investigating Sep 11, 2026, 10:19 PM GMT+08:00
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.
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identified Sep 11, 2026, 10:21 PM GMT+08:00
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.
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monitoring Sep 11, 2026, 10:28 PM GMT+08:00
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
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monitoring Sep 11, 2026, 10:28 PM GMT+08:00
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
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resolved Sep 11, 2026, 10:37 PM GMT+08:00
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC