Anthropic incident
Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1
Resolved after 1 hour 26 minutes, affecting claude.ai and Claude API (api.anthropic.com) and 1 more, on September 15, 2026.
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.
Affected components
Update timeline
- investigating Sep 15, 2026, 09:48 AM UTC
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.
- investigating Sep 15, 2026, 09:52 AM UTC
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.
- monitoring Sep 15, 2026, 10:50 AM UTC
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.
- resolved Sep 15, 2026, 11:14 AM UTC
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.
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