# Claude outage on 27 October 2026

> On 27 October, Claude had a major outage with elevated errors on requests to Claude Sonnet 5.5, affecting claude.ai, the Claude API, Claude Code and Claude Cowork. The outage lasted 41 minutes, from 09:15 to 09:57 UTC, though the status page showed the components affected only from 09:14 to 09:38, when it reported a fix had been deployed and recovery was being monitored, before marking the incident resolved at 09:56. Litmus also had a major outage at the same time, starting at 08:31 UTC.

- Service: [Claude](https://stackpulse.app/services/claude.md)
- Severity: major_outage
- Title on the status page: Elevated errors for Claude Sonnet 5.5
- Started: 2026-10-27 09:15 UTC
- Ended: 2026-10-27 09:57 UTC
- Lasted: 41 min
- Incident open on the status page: 09:14–09:56 UTC
- The status page's incident: https://stspg.io/rql9h590npxd
- Page: https://stackpulse.app/services/claude/outages/2026-10-27-0915

## What broke when (UTC)

| Component | Status | From | To |
|---|---|---|---|
| claude.ai | partial outage | 2026-10-27 09:14 | 2026-10-27 09:38 |
| Claude API (api.anthropic.com) | partial outage | 2026-10-27 09:14 | 2026-10-27 09:38 |
| Claude Code | partial outage | 2026-10-27 09:14 | 2026-10-27 09:38 |
| Claude Cowork | partial outage | 2026-10-27 09:14 | 2026-10-27 09:38 |

## At the same time

- [Litmus](https://stackpulse.app/services/litmus.md): major_outage from 2026-10-27 08:31 UTC

Problems at the same time are a clue, never proof that one caused another.

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