Claude API slowdown on 19 October 2026
Claude API from San Francisco: slower than usual; 2026-10-19 17:30 UTC to 2026-10-19 19:30 UTC: peak first visible token 1.53 s vs a usual 0.93 s.
- What our checks saw
- Slower than usual
- Cities affected
- San Francisco
- When
- to
- How long
- 2 hours
- Slowest check
- 1.53 s, usually 925 ms
- Anthropic's status page
- Open it
Where our checks saw it
Each glowing city had slow or failing checks during the incident, shown at its worst. We test from 6 cities, so other places may have been hit too.
Our checks, city by city
Each point is one check every 30 minutes, from three hours before the incident to three hours after. Coloured points are the checks we counted as slower or failing. The shaded area shows how far above the usual time they were. Not affected: Amsterdam, Montreal, Singapore, Tokyo, Mumbai.
San Francisco
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 14:30 | 1.08 s | Normal |
| 15:00 | 937 ms | Normal |
| 15:30 | 894 ms | Normal |
| 16:00 | 975 ms | Normal |
| 16:30 | 1.97 s | Slower than usual |
| 17:00 | 972 ms | Normal |
| 17:30 | 1.98 s | Slower than usual |
| 18:00 | 1.08 s | Normal |
| 18:30 | 966 ms | Normal |
| 19:00 | 910 ms | Normal |
| 19:30 | 1.06 s | Normal |
| 20:00 | 927 ms | Normal |
| 20:30 | 966 ms | Normal |
| 21:00 | 1.03 s | Normal |
| 21:30 | 971 ms | Normal |
| 22:00 | 1.26 s | Normal |
| 22:30 | 928 ms | Normal |
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