Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
A record of the Anthropic incident on September 15, 2026 (UTC): start time, duration and severity, plus current status, what to do, and alternatives.
Other providers down at the same time
2 other incident(s) at different providers overlapped with this one. It may not have been limited to a single service — several providers were degraded at once.
- ReplicateSome Replicate models are failing to start
- GitHubDisruption with some GitHub services
Derived from our own archive of official status pages across 13 providers. Items lasting more than 24 hours and unresolved items are excluded, as they would misrepresent the moment.
How big was this outage?
This outage lasted 86 minutes. Across 70 major incidents recorded for Anthropic, the median duration is 73 minutes, making this the 34th longest.
Longer than a typical outage.
Only incidents recorded as major-or-worse and already resolved are counted.
Current status
Anthropic is operating normally now. This incident has been resolved.
See current Anthropic status →What you can do during an outage
Source: Anthropic's official status page.
Other Anthropic incidents
- Elevated errors affecting the Google Calendar connectorOctober 28, 2026
- Elevated errors affecting the Gmail connectorOctober 28, 2026
- Elevated errors for Claude Sonnet 5.5October 27, 2026
- Elevated errors for Claude Sonnet 5.5October 27, 2026
- Elevated errors for Claude Fable 5.1October 25, 2026