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Anthropic · AIOct 27, 2026, 15:09 UTC yesterday

Elevated errors for Claude Sonnet 5.5

MajorNot disclosedUpdated 9h ago
Oct 27, 15:09 UTCOct 27, 15:50 UTC
Duration
41m
Impact
Major
Root cause
Not disclosed
Anthropic, 90 days
56 incidents
Affected
claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork
Status page

Final update

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.

Timeline

  1. Resolved · Oct 27, 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.
  2. Identified · Oct 27, 15:09 UTC
    We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

More from Anthropic

Full history
MajorOct 27, 09:14 UTC
Elevated errors for Claude Sonnet 5.5lasted 42m
MajorOct 25, 08:17 UTC
Elevated errors for Claude Fable 5.1lasted 32m
MajorOct 25, 06:14 UTC
Elevated errors for Claude Sonnet 5.5 and other modelslasted 1h 39m
MajorOct 24, 05:16 UTC
Elevated errors for Claude Fable 5 and Claude Fable 5.1lasted 37m
MajorOct 24, 00:31 UTC
Elevated errors for Claude Opus 5.5lasted 6m
CriticalOct 23, 23:37 UTC
Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5lasted 34m