Claude Status – Elevated errors for multiple models

Anthropic identified the cause of elevated errors affecting requests to Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 as of Sep 22, 2026 at 01:17 UTC and said it is working on a fix. The incident, first flagged as under investigation at 00:57 UTC, affects claude.ai, the Claude API at api.anthropic.com, Claude Code, and Claude Cowork.

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. Posted Sep 22, 2026 - 01:17 UTC 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. Posted Sep 22, 2026 - 00:57 UTC This incident affects: claude.ai, Claude API api.anthropic.com , Claude Code, and Claude Cowork. Subscribe to updates for Elevated errors for multiple models via email and/or text message. You'll receive email notifications when incidents are updated, and text message notifications whenever Claude creates or resolves an incident.