Anthropic outage — September 1, 2026
Degraded performance on platform.claude.com and Claude for Microsoft Office 365
Anthropic’s Claude.ai was disrupted for 1h 19m on September 1, 2026.
Key facts
| Detected | September 1, 2026 · 17:05 UTC |
| Confirmed | 17:05 UTC |
| Resolved | 18:24 UTC |
| Duration | 1h 19m |
| Service | Claude.ai |
| Official record | https://stspg.io/4rf459q4pjc3 |
Timeline
- 17:05Z
Detected · Signal
2 crowd signals for Claude.ai on ANTHROPIC crossed the signal threshold. - 17:05Z
Confirmed · Official
An official ANTHROPIC status-page notice corroborated the event the same cycle. - 18:24Z
Resolved
Signal volume fell back below the threshold; the event was closed.
Evidence
| Official status feed | degraded (changed 17:05 UTC) |
| Anomaly score | +0.61σ above this cell's own baseline |
| Engine confidence | 95% |
Outage-related signals per hour over the live window, oldest → newest (peak 1).
How this was detected
1 independent evidence class for claude-ai on ANTHROPIC. 2 crowd reports across bluesky (single platform — not corroborating), z=+0.6σ vs the cell baseline. Official notice confirms it.