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All agents  /  Claude API  /  History  /  Oct 27, 2026

Claude API outage on Oct 27, 2026: elevated errors for Claude Sonnet 5.5

Resolved after 41 min.

15:09 UTC to 15:50 UTC your time. Anthropic: “Elevated errors for Claude Sonnet 5.5.” 0 reports here during the incident.

Claude APIUpRight now Claude API is up. See live status

Reports during the incident

Every 15 minutes, 14:00 UTC to 17:00 UTC. Grey: normal. Red line: official incident.
14:00 UTC15:09 UTC15:50 UTC17:00 UTC

What people reported

0 reports during the incident

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Anthropic's updates

Quoted from status.claude.com

  1. 15:09 UTC

    Identified

    We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

  2. 15:50 UTC

    Resolved

    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.

Other Claude API incidents

Nov 826 minDegraded performance for Claude Fable 5.1Details
Oct 2742 minElevated errors for Claude Sonnet 5.5Details
Oct 2532 minElevated errors for Claude Fable 5.1Details
All Claude API incidents

Other agents

Claude CodeUpCodexUpCursor IDEUpGitHub CopilotUpGemini CLIUpOpenAI APIUpGitHubUp

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