# Anthropic: Elevated errors for Claude Opus 5.5

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-10-06 12:24 UTC · Resolved: 2026-10-06 12:43 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/bzc81gbv1b99](https://stspg.io/bzc81gbv1b99)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Summary

Claude Opus 5.5 requests experienced elevated errors affecting claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork. Anthropic rated the impact major; the incident started at 2026-10-06 12:24 UTC and was resolved at 2026-10-06 12:43 UTC, lasting 18 min. Anthropic identified the cause but did not disclose it or the fix. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-10-06 12:24 UTC: We are investigating elevated errors on requests to Claude Opus 5.5. We will provide an update as soon as possible.
- **identified** 2026-10-06 12:37 UTC: We have identified the cause of elevated errors on requests to Claude Opus 5.5 and are working on a fix. We will provide an update as soon as possible.
- **resolved** 2026-10-06 12:43 UTC: The issue affecting Claude Opus 5.5 has been resolved.

## Rewindex changes for this incident

- 2026-10-06 12:24 UTC: [Major incident: Elevated errors for Claude Opus 5.5](https://rewindex.com/change/i0354bd3e7a3cd2.md)


---
Canonical: https://rewindex.com/company/anthropic/incidents/ch27pb90bn85 · Markdown: https://rewindex.com/company/anthropic/incidents/ch27pb90bn85.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/ch27pb90bn85 · Generated 2026-10-18T11:40:01.231Z