Anthropic: Elevated errors for Claude Opus 5.5

Impact: majorStatus: resolvedStarted 2026-10-06 12:24 UTCResolved 2026-10-06 12:43 UTC (19 min)3 updatesSource: stspg.io

Summary

Claude Opus 5.5 requests experienced elevated errors affecting claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork. Anthropic rated the impact major; the incident started at 2026-10-06 12:24 UTC and was resolved at 2026-10-06 12:43 UTC, lasting 18 min. Anthropic identified the cause but did not disclose it or the fix.

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

investigating2026-10-06 12:24 UTC
We are investigating elevated errors on requests to Claude Opus 5.5. We will provide an update as soon as possible.
identified2026-10-06 12:37 UTC
We have identified the cause of elevated errors on requests to Claude Opus 5.5 and are working on a fix. We will provide an update as soon as possible.
resolved2026-10-06 12:43 UTC
The issue affecting Claude Opus 5.5 has been resolved.

Rewindex changes for this incident

Major incident: Elevated errors for Claude Opus 5.5 2026-10-06 12:24 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