Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1

Incident Report for Claude

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.
Posted Sep 15, 2026 - 11:14 UTC

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.
Posted Sep 15, 2026 - 10:50 UTC

Update

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.
Posted Sep 15, 2026 - 09:52 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.
Posted Sep 15, 2026 - 09:48 UTC
This incident affected: claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.
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