503RADARINCIDENT ARCHIVEMETHODOLOGY
RESOLVED

Anthropic outage — June 3, 2026

Elevated error rate on Opus 4.8

Anthropic’s Claude.ai was disrupted for 51d 3h on June 3, 2026.

Key facts

DetectedJune 3, 2026 · 07:13 UTC
Confirmed07:13 UTC
Resolved10:29 UTC
Duration51d 3h
ServiceClaude.ai
Official recordhttps://stspg.io/7xtkzmk161g1

Timeline

  1. 07:13Z

    Detected · Official

    Reported directly on ANTHROPIC's official status page — no earlier independent (crowd / dependency / measurement) signal.
  2. 10:29Z

    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.