# 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: 2026-10-05 13:05 UTC
- Resolved: 2026-10-05 13:21 UTC (lasted 16 min)
- Components: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Official update: https://stspg.io/wdqhxt8xt574

## Updates from Anthropic

### resolved, 2026-10-05 13:21 UTC

The issue affecting Claude Mythos 5.1 and Claude Fable 5.1 has been resolved. Impact occurred from 05:40 PT / 12:40 UTC to 06:10 PT / 13:10 UTC.

### investigating, 2026-10-05 13:05 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.