Anthropic outage — September 1, 2026
Degraded performance on claude.ai
Anthropic’s Claude.ai was disrupted for 37m on September 1, 2026.
Key facts
| Detected | September 1, 2026 · 16:02 UTC |
| Confirmed | 16:02 UTC |
| Resolved | 16:39 UTC |
| Duration | 37m |
| Service | Claude.ai |
| Official record | https://stspg.io/k8bzm26b6sy9 |
Timeline
- 16:02Z
Detected · Signal
1 crowd signal for Claude.ai on ANTHROPIC crossed the signal threshold. - 16:02Z
Confirmed · Official
An official ANTHROPIC status-page notice corroborated the event the same cycle. - 16:39Z
Resolved
Signal volume fell back below the threshold; the event was closed.
Evidence
| Official status feed | degraded (changed 16:02 UTC) |
| Anomaly score | -0.11σ 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. 1 crowd report across bluesky (single platform — not corroborating), z=-0.1σ vs the cell baseline. Official notice confirms it.