Anthropic incident: Elevated errors on Claude Opus 5

Affected components

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

1. resolvedJul 27, 2026, 12:30 UTC

   As of 4:47 PST / 11:47 UTC the errors have returned to baseline.

2. investigatingJul 27, 2026, 11:27 UTC

   We are currently investigating this issue.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in Anthropic's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

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• Cursor: Investigating service degradation — IDEMinor · Jul 27, 2026, 11:41 UTC

How often does Anthropic have incidents?

Anthropic reported 85 incidents in the last 90 days, 32 of them major or critical. A typical incident lasted 1h 7m. See Anthropic's uptime and incident history