Anthropic: Elevated errors for Claude Sonnet 5.5
Affected components: claude.aiClaude API - api.anthropic.comClaude CodeClaude Cowork
Timeline of updates
- 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.
Changes Rewindex caught on this incident
- Major incident: Elevated errors for Claude Sonnet 5.5
- Incident updated: Elevated errors for Claude Sonnet 5.5
Archive proof
Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves these records existed by then and have not been changed since, by anyone, Rewindex included.
How the archive is checked, and what it cannot prove.
First version captured
In the 2026-10-27 checkpoint, timestamped by DigiCert and FreeTSA on . Record hash
b23e00b7cf62dc0c…Version 2 captured
In the 2026-10-27 checkpoint, timestamped by DigiCert and FreeTSA on . Record hash
7a73346263b19909…
Impact, status and times are the vendor’s own, as last archived. View on status.claude.com (opens in new tab).
Cite this
Status incident (vendor impact label: major) posted by Anthropic, started 2026-10-27 15:09 UTC, resolved after 41 min, 2 update(s); edited after publishing.
- Title
- Elevated errors for Claude Sonnet 5.5
- Vendor
- Anthropic
- Date
- URL
- https://rewindex.com/company/anthropic/incidents/lqhknfdjrcst
Anthropic profileRecent Anthropic incidentsAll outages on October 27, 2026Anthropic in October 2026MarkdownJSON