# Anthropic: Elevated errors for Claude Sonnet 5.5

> Anthropic reported a major incident involving elevated errors on Claude Sonnet 5.5 requests across claude.ai, Claude API - api.anthropic.com, Claude Code, and Claude Cowork. It started at 2026-10-27 09:14 UTC and was still open when archived, with 0 min elapsed at the last update; Anthropic was inve

Canonical: https://rewindex.com/company/anthropic/incidents/0q89dylg9vjk
Last updated: 2026-10-27T10:04:02Z

- Impact (vendor’s label): major
- Status: resolved · edited after publishing
- Started: 2026-10-27 09:14 UTC · Resolved: 2026-10-27 09:56 UTC · Duration: 42 min
- Updates: 3 · Affected components: claude.ai, Claude API - api.anthropic.com, Claude Code, Claude Cowork
- [Vendor status page: https://status.claude.com/incidents/0q89dylg9vjk](https://status.claude.com/incidents/0q89dylg9vjk)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Summary

Anthropic reported a major incident involving elevated errors on Claude Sonnet 5.5 requests across claude.ai, Claude API - api.anthropic.com, Claude Code, and Claude Cowork. It started at 2026-10-27 09:14 UTC and was still open when archived, with 0 min elapsed at the last update; Anthropic was investigating, with no cause or fix stated. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-10-27 09:14 UTC: We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.
- **monitoring** 2026-10-27 09:38 UTC: A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
- **resolved** 2026-10-27 09:56 UTC: The issue affecting Claude services has been resolved.

## Rewindex changes for this incident

- 2026-10-27 09:14 UTC: [Major incident: Elevated errors for Claude Sonnet 5.5](https://rewindex.com/change/i81083f272a2ce9.md)
- 2026-10-27 09:43 UTC: [Incident updated: Elevated errors for Claude Sonnet 5.5](https://rewindex.com/change/r337646dd6dcdd1.md)
- 2026-10-27 10:04 UTC: [Incident updated: Elevated errors for Claude Sonnet 5.5](https://rewindex.com/change/r9bd94423131637.md)

## Cite this

Status incident (vendor impact label: major) posted by Anthropic, started 2026-10-27 09:14 UTC, resolved after 42 min, 3 update(s); edited after publishing.

- Canonical URL: https://rewindex.com/company/anthropic/incidents/0q89dylg9vjk
- Citation: Anthropic, “Elevated errors for Claude Sonnet 5.5” (2026-10-27 09:14 UTC). Archived by Rewindex: https://rewindex.com/company/anthropic/incidents/0q89dylg9vjk (CC BY 4.0).
- Markdown link: `[Anthropic: Elevated errors for Claude Sonnet 5.5 (2026-10-27)](https://rewindex.com/company/anthropic/incidents/0q89dylg9vjk)`


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Canonical: https://rewindex.com/company/anthropic/incidents/0q89dylg9vjk · Markdown: https://rewindex.com/company/anthropic/incidents/0q89dylg9vjk.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/0q89dylg9vjk · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:22:28.712Z