Anthropic outage — August 17, 2026
Degraded performance for Claude Opus 5, Claude Sonnet 5
Anthropic’s Claude.ai was disrupted for 5h 30m on August 17, 2026. 503Radar’s sensors raised the first signal at 10:24 UTC, 3h 43m before the official status page acknowledged impact.
Key facts
| Detected | August 17, 2026 · 10:24 UTC |
| Confirmed | 14:08 UTC · lead time 3h 43m |
| Resolved | 15:54 UTC |
| Duration | 5h 30m |
| Service | Claude.ai |
| Official record | https://stspg.io/dw9p8s0wg6hh |
Timeline
- 10:24Z
Detected · Signal
1 crowd signal for Claude.ai on ANTHROPIC crossed the signal threshold. - 14:08Z
Confirmed · Official
An official ANTHROPIC status-page notice corroborated the event — 3h 43m after detection. - 15:54Z
Resolved
Signal volume fell back below the threshold; the event was closed.
How this was detected
1 independent evidence class for claude-ai on ANTHROPIC. 1 crowd report across bluesky (single platform — not corroborating), z=-0.5σ vs the cell baseline. Official notice confirms it, 3h 43m after the crowd.