# Elevated errors for multiple models

- Provider: [Anthropic](https://down.guide/anthropic)
- Level: confirmed
- Impact: Partial outage
- lasted 1h 38m
- started 2026-09-22 00:57 UTC
- claude.ai, Claude API (api.anthropic.com), Claude Code +1
- id: DWN-1449aac454
- Official page: https://stspg.io/90s4l9yywzbk

## Updates from Anthropic
### 2026-09-22 00:57 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.

### 2026-09-22 01:17 UTC: identified
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.

### 2026-09-22 01:35 UTC: identified
We are continuing to work to resolve errors affecting some models. At this time, requests to Claude Fable 5 and 5.1 and Mythos 5 and 5.1 have returned to normal success rates. We are working to resolve remaining errors affecting Claude Opus 5, and will provide an additional update shortly.

### 2026-09-22 02:11 UTC: monitoring
We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.

### 2026-09-22 02:35 UTC: resolved
This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.

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