Outage in Anthropic
Elevated errors for Mythos 5, Fable 5, Opus 5 and Claude Haiku 4.5
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced elevated error rates affecting requests to Claude Mythos 5, Claude Fable 5, and Claude Haiku 4.5 across both claude.ai and the API. The issue was identified shortly after it began, with a fix implemented and the incident fully resolved within approximately 1.1 hours.
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Haiku 4.5. We will provide an update as soon as possible.
Trusted by 1,000+ teams
The Status Page Aggregator with Early Outage Detection
Stop finding out about outages from your users. Monitor 6,320+ cloud services and get alerted the second something breaks.
Latest Updates ( sorted recent to last )
RESOLVED
6 days ago - at 07/25/2026 07:44PM
This incident has been resolved.
IDENTIFIED
6 days ago - at 07/25/2026 06:44PM
The issue has been identified and a fix is being implemented.
INVESTIGATING
7 days ago - at 07/25/2026 06:40PM
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Haiku 4.5. We will provide an update as soon as possible.
Latest Anthropic outages
Degraded performance on Claude Sonnet 5 - 1 day ago
Degraded performance on Claude Opus 4.8 - 1 day ago
Elevated errors across many models - 2 days ago
Elevated errors across all models - 2 days ago
Elevated errors on Claude Opus 5 and Haiku 4.5 - 5 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
