ChatGPT API slowdown on 25 September 2026

ChatGPT API from Amsterdam, Mumbai, Singapore: slower than usual; 2026-09-25 14:00 UTC to 2026-09-25 17:00 UTC: peak first visible token 2.87 s vs a usual 1.38 s.

What our checks saw: Slower than usual
Cities affected: Amsterdam, Mumbai, Singapore
When: 25 Sept, 14:00 UTC to 25 Sept, 17:00 UTC
How long: 3 hours
Slowest check: 2.87 s, usually 1.38 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: San Francisco, Montreal, Tokyo.

Amsterdam

Each check (UTC)Usual (1.38 s)Slower than usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
11:00	1.58 s	Normal
11:30	1.20 s	Normal
12:00	1.32 s	Normal
12:30	1.81 s	Normal
13:00	1.67 s	Normal
13:30	2.72 s	Slower than usual
14:00	3.03 s	Slower than usual
14:30	1.40 s	Normal
15:00	1.38 s	Normal
15:30	1.33 s	Normal
16:00	1.38 s	Normal
16:30	1.43 s	Normal
17:00	1.45 s	Normal
17:30	1.56 s	Normal
18:00	1.30 s	Normal
18:30	1.83 s	Normal
19:00	1.44 s	Normal
19:30	1.74 s	Normal
20:00	1.61 s	Normal

Singapore

Each check (UTC)Usual (1.30 s)Slower than usualIncident

Every check as a table

Time (UTC)	Check	Reading
11:00	983 ms	Normal
11:30	1.08 s	Normal
12:00	1.47 s	Normal
12:30	1.51 s	Normal
13:00	1.30 s	Normal
13:30	1.39 s	Normal
14:00	1.91 s	Normal
14:30	1.97 s	Slower than usual
15:00	1.60 s	Normal
15:30	1.36 s	Normal
16:00	1.27 s	Normal
16:30	1.35 s	Normal
17:00	1.45 s	Normal
17:30	1.24 s	Normal
18:00	1.38 s	Normal
18:30	1.17 s	Normal
19:00	1.63 s	Normal
19:30	1.23 s	Normal
20:00	991 ms	Normal

Mumbai

Each check (UTC)Usual (1.71 s)Slower than usualIncident

Every check as a table

Time (UTC)	Check	Reading
11:00	2.06 s	Normal
11:30	2.07 s	Normal
12:00	1.62 s	Normal
12:30	1.80 s	Normal
13:00	1.77 s	Normal
13:30	2.16 s	Normal
14:00	2.31 s	Normal
14:30	3.07 s	Slower than usual
15:00	2.56 s	Normal
15:30	2.42 s	Normal
16:00	1.97 s	Normal
16:30	1.98 s	Normal
17:00	2.31 s	Normal
17:30	1.94 s	Normal
18:00	2.47 s	Normal
18:30	1.75 s	Normal
19:00	1.82 s	Normal
19:30	2.42 s	Normal
20:00	1.41 s	Normal

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