Claude API slowdown on 28 September 2026
Claude API from Amsterdam, Mumbai, San Francisco, Tokyo, Montreal: slower than usual; 2026-09-28 21:00 UTC to 2026-09-28 23:00 UTC: peak first visible token 3.08 s vs a usual 1.41 s.
- What our checks saw
- Slower than usual
- Cities affected
- Amsterdam, Mumbai, San Francisco, Tokyo, Montreal
- When
- to
- How long
- 2 hours
- Slowest check
- 3.08 s, usually 1.41 s
- 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: Singapore.
Amsterdam
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 18:00 | 1.58 s | Normal |
| 18:30 | 1.94 s | Normal |
| 19:00 | 1.79 s | Normal |
| 19:30 | 1.81 s | Normal |
| 20:00 | 1.70 s | Normal |
| 20:30 | 1.62 s | Normal |
| 21:00 | 3.55 s | Slower than usual |
| 21:30 | 2.41 s | Slower than usual |
| 22:00 | 1.58 s | Normal |
| 22:30 | 1.21 s | Normal |
| 23:00 | 1.27 s | Normal |
| 23:30 | 1.41 s | Normal |
| 00:00 | 1.68 s | Normal |
| 00:30 | 1.47 s | Normal |
| 01:00 | 1.62 s | Normal |
| 01:30 | 1.60 s | Normal |
| 02:00 | 1.80 s | Normal |
San Francisco
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 18:00 | 1.52 s | Normal |
| 18:30 | 1.63 s | Normal |
| 19:00 | 1.69 s | Normal |
| 19:30 | 1.68 s | Normal |
| 20:00 | 1.62 s | Normal |
| 20:30 | 1.54 s | Normal |
| 21:00 | 3.29 s | Slower than usual |
| 21:30 | 1.65 s | Normal |
| 22:00 | 1.38 s | Normal |
| 22:30 | 1.07 s | Normal |
| 23:00 | 1.20 s | Normal |
| 23:30 | 1.35 s | Normal |
| 00:00 | 1.78 s | Normal |
| 00:30 | 1.35 s | Normal |
| 01:00 | 1.31 s | Normal |
| 01:30 | 1.30 s | Normal |
| 02:00 | 1.61 s | Normal |
Montreal
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 18:00 | 1.75 s | Normal |
| 18:30 | 1.81 s | Normal |
| 19:00 | 1.70 s | Normal |
| 19:30 | 1.63 s | Normal |
| 20:00 | 1.50 s | Normal |
| 20:30 | 1.60 s | Normal |
| 21:00 | 2.71 s | Slower than usual |
| 21:30 | 1.74 s | Normal |
| 22:00 | 1.23 s | Normal |
| 22:30 | 1.09 s | Normal |
| 23:00 | 1.11 s | Normal |
| 23:30 | 1.26 s | Normal |
| 00:00 | 1.53 s | Normal |
| 00:30 | 1.30 s | Normal |
| 01:00 | 1.33 s | Normal |
| 01:30 | 1.48 s | Normal |
| 02:00 | 1.39 s | Normal |
Tokyo
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 18:00 | 1.57 s | Normal |
| 18:30 | 1.79 s | Normal |
| 19:00 | 1.67 s | Normal |
| 19:30 | 1.72 s | Normal |
| 20:00 | 1.67 s | Normal |
| 20:30 | 1.65 s | Normal |
| 21:00 | 4.32 s | Much slower, or failing |
| 21:30 | 1.83 s | Normal |
| 22:00 | 1.59 s | Normal |
| 22:30 | 1.20 s | Normal |
| 23:00 | 1.31 s | Normal |
| 23:30 | 1.31 s | Normal |
| 00:00 | 1.57 s | Normal |
| 00:30 | 1.32 s | Normal |
| 01:00 | 1.53 s | Normal |
| 01:30 | 1.57 s | Normal |
| 02:00 | 1.49 s | Normal |
Mumbai
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 18:00 | 1.66 s | Normal |
| 18:30 | 1.85 s | Normal |
| 19:00 | 2.22 s | Normal |
| 19:30 | 1.81 s | Normal |
| 20:00 | 1.99 s | Normal |
| 20:30 | 1.74 s | Normal |
| 21:00 | 3.23 s | Slower than usual |
| 21:30 | 1.64 s | Normal |
| 22:00 | 1.33 s | Normal |
| 22:30 | 1.59 s | Normal |
| 23:00 | 1.42 s | Normal |
| 23:30 | 1.57 s | Normal |
| 00:00 | 1.67 s | Normal |
| 00:30 | 1.47 s | Normal |
| 01:00 | 1.61 s | Normal |
| 01:30 | 1.58 s | Normal |
| 02:00 | 1.75 s | Normal |
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