# Anthropic: Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1

- Provider: [Anthropic](https://outages.cc/anthropic.md)
- Type: Incident
- State: Resolved
- Worst impact: Partial outage
- Started: 2026-09-11 14:19 UTC
- Resolved: 2026-09-11 14:37 UTC (lasted 17 min)
- Components: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Official update: https://stspg.io/n9n8kfcxtkfm

## Updates from Anthropic

### resolved, 2026-09-11 14:37 UTC

The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC

### monitoring, 2026-09-11 14:28 UTC

A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

### monitoring, 2026-09-11 14:28 UTC

A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery.

### identified, 2026-09-11 14:21 UTC

We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible.

### investigating, 2026-09-11 14:19 UTC

We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible.