503RADARINCIDENT ARCHIVEMETHODOLOGY
RESOLVED

Anthropic outage — September 3, 2026

Elevated errors for Claude Sonnet 5

Anthropic’s Claude.ai was disrupted for 47m on September 3, 2026.

Key facts

DetectedSeptember 3, 2026 · 12:37 UTC
Confirmed12:37 UTC
Resolved13:24 UTC
Duration47m
ServiceClaude.ai
Official recordhttps://stspg.io/jt14jk41pjsf

Timeline

  1. 12:37Z

    Detected · Official

    Reported directly on ANTHROPIC's official status page — no earlier independent (crowd / dependency / measurement) signal.
  2. 13:24Z

    Resolved

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

Evidence

Official status feeddegraded (changed 12:37 UTC)
Anomaly score+0.00σ above this cell's own baseline
Engine confidence95%

Outage-related signals per hour over the live window, oldest → newest (peak 1).

How this was detected

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