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Claude incident

Elevated errors for multiple models

Resolved after 2 h 57 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 multiple models
  2. Claude status page · Investigating We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5. 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, Claude Fable 5.1, and Claude Opus 5 and are working on a fix. We will provide an update as soon as possible.
  4. Claude status page · Identified An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.
  5. Claude status page · Identified We are continuing to work on a fix for this issue.
  6. Claude status page · Identified The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.
  7. Claude status page · Monitoring A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.
  8. Claude status page · Resolved The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.

Cite this incident

Site Qwality, “Elevated errors for multiple models,” Sep 3, 2026, https://siteqwality.com/is-claude-down/incidents/claude-202609031326/

Free to quote with a link to this page.