Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
Sep 11, 14:19 UTCSep 11, 14:37 UTC
Duration
17m
Impact
Major
Root cause
Not disclosed
Anthropic, 90 days
94 incidents
Affected
claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork
Final update
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
Timeline
- Resolved · Sep 11, 14:37 UTC
The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC
- Monitoring · Sep 11, 14:28 UTC
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
- Monitoring · Sep 11, 14:28 UTC
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
- Identified · Sep 11, 14:21 UTC
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.
- Investigating · Sep 11, 14:19 UTC
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.
More from Anthropic
Full history| Started | Incident | Impact | Duration |
|---|---|---|---|
| Sep 2200:57 UTC | Elevated errors for multiple models | major | 1h 38m |
| Sep 1616:18 UTC | Issues with Google Play subscriptions | none | 33m |
| Sep 1509:48 UTC | Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1 | major | 1h 26m |
| Sep 1021:43 UTC | Elevated latency on the Claude API for some users | minor | 1h 41m |
| Sep 1015:54 UTC | Degraded functionality for Claude Cowork on Windows | major | 4d 3h |
| Sep 313:26 UTC | Elevated errors for multiple models | major | 2h 57m |
Sources: vendors' own status pages, published postmortems and SEC 8-K Item 1.05 filings, read daily. Times as reported. Logos via logo.dev; trademarks belong to their owners.