Anthropic outage — July 27, 2026

Elevated errors on Claude Opus 5 and Haiku 4.5

Anthropic’s Claude.ai was disrupted for 1h 11m on July 27, 2026.

Key facts

Timeline

1. 13:43Z

   Detected · Official

   Reported directly on ANTHROPIC's official status page — no earlier independent (crowd / dependency / measurement) signal.
2. 14:54Z

   Resolved

   Signal volume fell back below the threshold; the event was closed.

How this was detected

Confirmed by ANTHROPIC's official status page — no independent (crowd / dependency / measurement) corroboration.