minorResolvedAnthropicv5.5

Anthropic: Elevated errors for Claude Sonnet 5.5

Investigating(done)
Trending(skipped)
Workaround available(skipped)
Resolved(current)

Executive summary

Elevated error rates have been observed for requests to the Claude Sonnet API version 5.5, affecting claude.ai, Claude Code, and Claude Cowork. The issue has been resolved.

No verified workaround yet

This incident was resolved upstream without a reported workaround.

Official fix

Technical root cause

Under active investigation. No report has identified a root cause yet.

Evidence

1 report · 1 StatusShow

[1]
Status First report11 days ago
Elevated errors for Claude Sonnet 5.5(opens official status page in a new tab)
Identified: We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible. 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.
by anthropic status

Timeline

First report on status pageOct 27, 15:50 UTC
Elevated errors for Claude Sonnet 5.5
Source
Official statementOct 27, 15:50 UTC
Identified: We are investigating elevated errors on requests to Claude Sonnet 5.5.
Source
Status changedOct 27, 15:50 UTC
Status changed: new → resolved (official status page reports resolution).