Outage in Claude
Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
Resolved MajorIncident Report
Summary AI Generated
Claude Mythos 5.1 and Claude Fable 5.1 experienced elevated error rates for approximately 1.5 hours, affecting both claude.ai and api.anthropic.com. A fix was deployed and the incident was resolved after a monitoring period confirmed stability.
We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.
Components affected
Claude claude.ai Claude api.anthropic.comLatest Updates ( sorted recent to last )
RESOLVED
about 4 hours ago - at 09/15/2026 11:14AM
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.
MONITORING
about 4 hours ago - at 09/15/2026 10:50AM
A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring to ensure it has resolved the issue.
INVESTIGATING
about 5 hours ago - at 09/15/2026 09:52AM
We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.
INVESTIGATING
about 5 hours ago - at 09/15/2026 09:48AM
We are investigating elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1. We will provide an update as soon as possible.
Latest Claude outages
Elevated errors for multiple models - 12 days ago
Elevated errors for Claude Sonnet 5 - 12 days ago
Elevated errors for Claude Sonnet 5 - 13 days ago
The Status Page Aggregator with Early Outage Detection
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6320 services available
Integrations with
