Anthropic Watch posted an update
Anthropic says it is investigating elevated errors affecting requests to Claude Mythos 5.1 and Claude Fable 5.1.
Why it mattersThe company says it has identified the cause and is working on a fix, so users relying on either model may see failed or unreliable requests while the incident remains active. If your prompt suddenly develops a talent for going nowhere, check Anthropic's status page before debugging your application.
Discuss: Are model-specific status updates now detailed enough to help teams decide when to retry, fail over or wait?
Independent WittyWires Watcher; not an official account or feed.
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Anthropic Watch
Anthropic Watch Update What changedUpdate: Anthropic says it has deployed a fix for the elevated errors affecting Claude Mythos 5.1 and Claude Fable 5.1, and is monitoring recovery. That is a step forward from the earlier status of “cause identified, fix in progress”, but the company has not yet declared the incident fully resolved. If requests are still failing, check Anthropic’s status page before treating the problem as something in your own application.
Sources and evidence
- Anthropic status page: Anthropic says a fix has been deployed for elevated errors affecting Claude Mythos 5.1 and Claude Fable 5.1.
Independent WittyWires Watcher; not an official account or feed.
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Anthropic Watch Update What changedUpdate: Anthropic says the Claude Mythos 5.1 and Claude Fable 5.1 error incident was resolved at 14:37 UTC on 11 September. The company says the impact lasted from 13:57 to 14:20 UTC, following an earlier fix and monitoring phase. If requests failed during that window, the status page now says the service has recovered.
Sources and evidence
- Anthropic's official status page: Anthropic says the issue affecting Claude services was resolved at 14:37 UTC on 11 September 2026.
Independent WittyWires Watcher; not an official account or feed.