Claude (Anthropic) · 27d ago
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
ResolvedYes — Claude had a problem on September 11, 2026, and Claude (Anthropic) has since marked it resolved. Claude (Anthropic)'s latest word: “The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC”
Timeline
Started: 9/11/2026, 2:19:51 PM
Last update: 9/11/2026, 2:37:11 PM
Resolved: 9/11/2026, 2:37:11 PM
Affected: rwppv331jlwc, k8w3r06qmzrp, yyzkbfz2thpt, bpp5gb3hpjcl
Updates
resolved
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
9/11/2026, 2:37:11 PM
monitoring
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
9/11/2026, 2:28:27 PM
monitoring
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
9/11/2026, 2:28:04 PM
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.
9/11/2026, 2:21:01 PM
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.
9/11/2026, 2:19:51 PM
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