Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
View the provider incident record →Current answer
Anthropic (Claude) experienced a major incident: Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1. ServiceAlert observed recovery on Sep 15, 2026.
Official Anthropic (Claude) status page Current Anthropic (Claude) status
ServiceAlert observed status change:
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Incident Lifecycle
Affected Components
claude.ai
Claude API (api.anthropic.com)
Claude Code
Claude Cowork
Incident Timeline
Monitoring
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.
Sep 15, 2026 at 10:50 AM UTC
Investigating
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.
Sep 15, 2026 at 9:52 AM UTC
Investigating
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.
Sep 15, 2026 at 9:48 AM UTC
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