Anthropic: Elevated errors for Claude Sonnet 5

Impact: majorStatus: resolvedStarted 2026-09-02 21:17 UTCResolved 2026-09-02 21:44 UTC (26 min)2 updatesSource: stspg.io

Summary

Claude Sonnet 5 requests experienced elevated errors affecting claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork. Anthropic rated the incident major; it started at 2026-09-02 21:17 UTC and was resolved after 26 min. The resolution update separately reported customer impact from 21:05 UTC to 21:19 UTC.

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

Affected components: Claude CoworkClaude API (api.anthropic.com)claude.aiClaude Code

Timeline of updates

investigating2026-09-02 21:17 UTC
We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.
resolved2026-09-02 21:44 UTC
The issue affecting Claude Sonnet 5 has been resolved. Impact occurred from 2:05pm PT / 21:05 UTC to 2:19pm PT / 21:19 UTC.

Rewindex changes for this incident

Major incident: Elevated errors for Claude Sonnet 5 2026-09-02 21:17 UTC

Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab). Anthropic profile · Recent Anthropic incidents · Markdown · JSON