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[ARTICLE · art-126961] src=status.claude.com ↗ pub= topic=ai-products verified=true sentiment=· neutral

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Anthropic resolved elevated error rates on requests to Claude Mythos 5.1 and Claude Fable 5.1, with impact lasting from 13:57 to 14:20 UTC on September 11, according to the company's status updates. Anthropic identified the cause at 14:21 UTC, deployed a fix at 14:28 UTC, and confirmed resolution at 14:37 UTC.

read1 min views4 publishedSep 11, 2026

Sep 11, 14:37 UTC

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

Sep 11, 14:28 UTC

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

Sep 11, 14:28 UTC

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

Sep 11, 14:21 UTC

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.

Sep 11, 14:19 UTC

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.

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