# Anthropic: Elevated errors for multiple models

- Provider: [Anthropic](https://outages.cc/anthropic.md)
- Type: Incident
- State: Resolved
- Worst impact: Partial outage
- Started: 2026-09-03 13:26 UTC
- Resolved: 2026-09-03 16:23 UTC (lasted 2 h 57 min)
- Components: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Official update: https://stspg.io/9xz4hhmd1jzn

## Updates from Anthropic

### resolved, 2026-09-03 16:23 UTC

The issue affecting Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 has been resolved. Impact has ended as of 9:16 PT / 16:16 UTC.

### monitoring, 2026-09-03 16:06 UTC

A fix has been deployed for Claude Mythos 5.1, Claude Fable 5.1, and Claude Opus 5 and we are monitoring for recovery.

### identified, 2026-09-03 15:25 UTC

The only affected models right now are Opus 4.8 and Opus 5. The rest of the models have recovered to baseline error rate.

### identified, 2026-09-03 14:49 UTC

We are continuing to work on a fix for this issue.

### identified, 2026-09-03 13:50 UTC

An exhaustive list of affected models: Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, Opus 4.6.

### identified, 2026-09-03 13:41 UTC

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.

### investigating, 2026-09-03 13:26 UTC

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.