Major impactResolvedAI/ML

Anthropic outage: Elevated errors for Claude Sonnet 5.5

Anthropic reported this major-impact incident on its official status page on Oct 27, 2026, 15:09 UTC. It was resolved after 41 min.

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Oct 27, 2026, 15:09 UTC

started

Oct 27, 2026, 15:50 UTC

resolved

41 min

duration

Major

impact

Affected components

Claude API (api.anthropic.com)
Claude Code
Claude Cowork
claude.ai

Timeline

updates from Anthropic's status page ↗

resolvedOct 27, 2026, 15:50 UTC
The issue affecting claude.ai, the Claude API, Claude Code, and Claude Cowork has been resolved. Impact occurred from 07:42 PT / 14:42 UTC to 08:17 PT / 15:17 UTC.
identifiedOct 27, 2026, 15:09 UTC
We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

What APIStatus.watch saw

Oct 27, 2026, 15:09 UTCoperational → degraded
Oct 27, 2026, 15:54 UTCdegraded → operational

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How often does Anthropic have incidents?

Anthropic reported 54 incidents in the last 90 days, 29 of them major or critical. A typical incident lasted 54 min. See Anthropic's uptime and incident history

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