ChatGPT API slowdown on 25 September 2026
ChatGPT API from Singapore, Tokyo, Montreal: slower than usual; 2026-09-25 00:30 UTC to 2026-09-25 02:00 UTC: peak first visible token 2.14 s vs a usual 1.29 s.
- What our checks saw
- Slower than usual
- Cities affected
- Singapore, Tokyo, Montreal
- When
- to
- How long
- 90 minutes
- Slowest check
- 2.14 s, usually 1.29 s
- OpenAI'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, San Francisco, Mumbai.
Montreal
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 21:30 | 1.17 s | Normal |
| 22:00 | 1.12 s | Normal |
| 22:30 | 885 ms | Normal |
| 23:00 | 988 ms | Normal |
| 23:30 | 1.20 s | Normal |
| 00:00 | 2.17 s | Slower than usual |
| 00:30 | 1.83 s | Normal |
| 01:00 | 1.34 s | Normal |
| 01:30 | 1.21 s | Normal |
| 02:00 | 988 ms | Normal |
| 02:30 | 1.67 s | Normal |
| 03:00 | 1.51 s | Normal |
| 03:30 | 1.50 s | Normal |
| 04:00 | 1.16 s | Normal |
| 04:30 | 1.35 s | Normal |
| 05:00 | 1.18 s | Normal |
Singapore
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 21:30 | 911 ms | Normal |
| 22:00 | 1.01 s | Normal |
| 22:30 | 1.33 s | Normal |
| 23:00 | 1.51 s | Normal |
| 23:30 | 1.84 s | Normal |
| 00:00 | 2.79 s | Slower than usual |
| 00:30 | 1.49 s | Normal |
| 01:00 | 1.80 s | Normal |
| 01:30 | 1.41 s | Normal |
| 02:00 | 1.36 s | Normal |
| 02:30 | 977 ms | Normal |
| 03:00 | 1.37 s | Normal |
| 03:30 | 1.26 s | Normal |
| 04:00 | 1.99 s | Slower than usual |
| 04:30 | 1.20 s | Normal |
| 05:00 | 1.25 s | Normal |
Tokyo
Every check as a table
| Time (UTC) | Check | Reading |
|---|---|---|
| 21:30 | 1.36 s | Normal |
| 22:00 | 1.74 s | Normal |
| 22:30 | 1.43 s | Normal |
| 23:00 | 759 ms | Normal |
| 23:30 | 1.48 s | Normal |
| 00:00 | 2.39 s | Slower than usual |
| 00:30 | 1.58 s | Normal |
| 01:00 | 1.12 s | Normal |
| 01:30 | 1.62 s | Normal |
| 02:00 | 1.06 s | Normal |
| 02:30 | 1.61 s | Normal |
| 03:00 | 1.27 s | Normal |
| 03:30 | 1.05 s | Normal |
| 04:00 | 1.30 s | Normal |
| 04:30 | 1.31 s | Normal |
| 05:00 | 1.57 s | Normal |
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