Anthropic outage: Elevated errors for Claude Opus 5.5

Affected components

• Claude API (api.anthropic.com)
• Claude Code
• Claude Cowork
• claude.ai

1. resolvedOct 6, 2026, 12:43 UTC

   The issue affecting Claude Opus 5.5 has been resolved.

2. identifiedOct 6, 2026, 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.

3. investigatingOct 6, 2026, 12:24 UTC

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

What APIStatus.watch saw

• Oct 6, 2026, 12:28 UTCoperational → degraded
• Oct 6, 2026, 12:43 UTCdegraded → operational

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How often does Anthropic have incidents?

Anthropic reported 81 incidents in the last 90 days, 32 of them major or critical. A typical incident lasted 1h 4m. See Anthropic's uptime and incident history