# Anthropic: Elevated errors for multiple models

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-09-22 00:57 UTC · Resolved: 2026-09-22 02:35 UTC · Duration: 1.6 h
- Updates: 5 · Affected components: Claude Cowork, Claude API (api.anthropic.com), claude.ai, Claude Code
- [Vendor status page: https://stspg.io/90s4l9yywzbk](https://stspg.io/90s4l9yywzbk)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Summary

Anthropic reported a major outage with elevated request errors affecting Claude Mythos 5 and 5.1, Claude Fable 5 and 5.1, and Claude Opus 5. The incident started 2026-09-22 00:57 UTC and resolved at 2026-09-22 02:35 UTC (1 h 37 min); Anthropic stated actual impact occurred from 00:50 UTC to 02:10 UTC. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-09-22 00:57 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.
- **identified** 2026-09-22 01:17 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.
- **identified** 2026-09-22 01:35 UTC: 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.
- **monitoring** 2026-09-22 02:11 UTC: We have seen success rates return to normal across affected models, and are monitoring closely to ensure no further issues.
- **resolved** 2026-09-22 02:35 UTC: This issue has been resolved. Impact occurred from 5:50pm PT / 00:50 UTC to 7:10pm PT / 02:10 UTC.

## Rewindex changes for this incident

- 2026-09-22 00:57 UTC: [Major incident: Elevated errors for multiple models](https://rewindex.com/change/iaa554370609141.md)


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Canonical: https://rewindex.com/company/anthropic/incidents/7g1qpkyz5gxh · Markdown: https://rewindex.com/company/anthropic/incidents/7g1qpkyz5gxh.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/7g1qpkyz5gxh · Generated 2026-10-18T10:43:11.624Z