# Anthropic: Elevated errors for Claude Sonnet 5

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-09-03 12:37 UTC · Resolved: 2026-09-03 12:56 UTC · Duration: 19 min
- Updates: 3 · Affected components: Claude Cowork, Claude API (api.anthropic.com), claude.ai, Claude Code
- [Vendor status page: https://stspg.io/jt14jk41pjsf](https://stspg.io/jt14jk41pjsf)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Summary

Claude Sonnet 5 requests experienced elevated errors across claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork, with major impact. The incident started at 2026-09-03 12:37 UTC and was resolved at 2026-09-03 12:56 UTC; the reported duration was 18 min. Anthropic implemented a fix and monitored results before resolution. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-09-03 12:37 UTC: We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.
- **monitoring** 2026-09-03 12:47 UTC: A fix has been implemented and we are monitoring the results.
- **resolved** 2026-09-03 12:56 UTC: This incident has been resolved.

## Rewindex changes for this incident

- 2026-09-03 12:37 UTC: [Major incident: Elevated errors for Claude Sonnet 5](https://rewindex.com/change/i0a4234a6cc1bd9.md)


---
Canonical: https://rewindex.com/company/anthropic/incidents/288w7p4hk1l1 · Markdown: https://rewindex.com/company/anthropic/incidents/288w7p4hk1l1.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/288w7p4hk1l1 · Generated 2026-10-18T09:55:42.963Z