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Claude: Elevated errors for Claude Sonnet 5.5

MajorStatus: resolvededitedStarted Resolved (42 min)3 updatesstatus.claude.com (opens in new tab)
Summary

Claude reported elevated errors on Claude Sonnet 5.5 requests affecting claude.ai, Claude API - api.anthropic.com, Claude Code, and Claude Cowork, with major impact. The incident started at 2026-10-27 09:14 UTC and was still open when archived, open for 0 min at the last update; investigation was ongoing, with no cause or fix stated.

Machine-written from the archived incident (Sol). Check the timeline before relying on it.

Affected components: claude.aiClaude API - api.anthropic.comClaude CodeClaude Cowork

Timeline of updates

  1. investigating

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

  2. monitoring

    A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

  3. resolved

    The issue affecting Claude services has been resolved.

Changes Rewindex caught on this incident

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.

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 Claude, started 2026-10-27 09:14 UTC, resolved after 42 min, 3 update(s); edited after publishing.

Title
Elevated errors for Claude Sonnet 5.5
Vendor
Claude
Date
URL
https://rewindex.com/company/claude/incidents/0q89dylg9vjk

Claude profileRecent Claude incidentsAll outages on October 27, 2026Claude in October 2026MarkdownJSON