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, 09:14 UTC. It was resolved after 42 min.

Right now Anthropic is operational. Live Anthropic status →

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Oct 27, 2026, 09:14 UTC

started

Oct 27, 2026, 09:56 UTC

resolved

42 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, 09:56 UTC
The issue affecting Claude services has been resolved.
monitoringOct 27, 2026, 09:38 UTC
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
investigatingOct 27, 2026, 09:14 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, 09:19 UTCoperational → degraded
Oct 27, 2026, 09:39 UTCdegraded → operational

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How often does Anthropic have incidents?

Anthropic reported 45 incidents in the last 90 days, 26 of them major or critical. A typical incident lasted 1h 13m. See Anthropic's uptime and incident history

← Previous: Elevated errors for Claude Fable 5.1 (Oct 25, 2026)Next: Elevated errors for Claude Sonnet 5.5 (Oct 27, 2026) →