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Claude incident

Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

Resolved after 17 min.

Started
Ended
Worst state
Partial outage
On Claude’s status page
Source
Components
Claude API (api.anthropic.com), Claude Code, Claude Cowork, claude.ai

Live Claude status Full Claude outage history

Timeline

  1. Claude status page · Reported Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1
  2. Claude status page · Investigating We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible.
  3. Claude status page · Identified We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible.
  4. Claude status page · Monitoring A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.
  5. Claude status page · Monitoring A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
  6. Claude status page · Resolved The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC

Cite this incident

Site Qwality, “Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1,” Sep 11, 2026, https://siteqwality.com/is-claude-down/incidents/claude-202609111419/

Free to quote with a link to this page.