Anthropic: Elevated errors for Claude Sonnet 5

Impact: majorStatus: resolvedStarted 2026-09-03 12:37 UTCResolved 2026-09-03 12:56 UTC (19 min)3 updatesSource: stspg.io

Summary

Claude Sonnet 5 requests experienced elevated errors across claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork, with major impact. The incident started at 2026-09-03 12:37 UTC and was resolved at 2026-09-03 12:56 UTC; the reported duration was 18 min. Anthropic implemented a fix and monitored results before resolution.

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

investigating2026-09-03 12:37 UTC
We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.
monitoring2026-09-03 12:47 UTC
A fix has been implemented and we are monitoring the results.
resolved2026-09-03 12:56 UTC
This incident has been resolved.

Rewindex changes for this incident

Major incident: Elevated errors for Claude Sonnet 5 2026-09-03 12:37 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