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Claude incident

Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

Resolved after 1 h 26 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 Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
  2. Claude status page · 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.
  3. Claude status page · 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.
  4. Claude status page · 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.
  5. Claude status page · Resolved 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.

Cite this incident

Site Qwality, “Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1,” Sep 15, 2026, https://siteqwality.com/is-claude-down/incidents/claude-202609150948/

Free to quote with a link to this page.