Outage in Anthropic
Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5
Resolved MajorIncident Report
Summary AI Generated
Anthropic experienced elevated errors across Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5 via both claude.ai and the API, lasting approximately 1.6 hours. The scope narrowed over time to focus on Mythos 5 and Fable 5 before full resolution. The incident was resolved with no further action required.
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. We will provide an update as soon as possible.
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Latest Updates ( sorted recent to last )
RESOLVED
8 days ago - at 08/13/2026 04:08PM
The issue affecting Claude Mythos 5 and Claude Fable 5 has been resolved.
INVESTIGATING
8 days ago - at 08/13/2026 03:44PM
We are investigating elevated errors on requests to Claude Mythos 5 and Claude Fable 5. We will provide an update as soon as possible.
INVESTIGATING
8 days ago - at 08/13/2026 02:33PM
We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. We will provide an update as soon as possible.
Latest Anthropic outages
Elevated errors on requests to multiple models - about 19 hours ago
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Degraded performance for multiple models - 3 days ago
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