ChatGPT API slowdown on 29 September 2026

ChatGPT API from Amsterdam, Mumbai, San Francisco, Singapore, Tokyo, Montreal: slower than usual; 2026-09-29 03:30 UTC to 2026-09-29 05:30 UTC: peak first visible token 2.86 s vs a usual 1.24 s.

What our checks saw: Slower than usual
Cities affected: Amsterdam, Mumbai, San Francisco, Singapore, Tokyo, Montreal
When: 29 Sept, 03:30 UTC to 29 Sept, 05:30 UTC
How long: 2 hours
Slowest check: 2.86 s, usually 1.24 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.

Amsterdam

Each check (UTC)Usual (1.23 s)Much slower, or failingIncident

Every check as a table

Time (UTC)	Check	Reading
00:30	1.07 s	Normal
01:00	1.74 s	Normal
01:30	1.13 s	Normal
02:00	1.18 s	Normal
02:30	1.52 s	Normal
03:00	1.45 s	Normal
03:30	3.86 s	Much slower, or failing
04:00	1.17 s	Normal
04:30	1.03 s	Normal
05:00	939 ms	Normal
05:30	1.55 s	Normal
06:00	1.67 s	Normal
06:30	1.56 s	Normal
07:00	1.08 s	Normal
07:30	1.25 s	Normal
08:00	1.75 s	Normal
08:30	1.18 s	Normal

San Francisco

Each check (UTC)Usual (1.08 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
00:30	1.10 s	Normal
01:00	2.29 s	Slower than usual
01:30	1.48 s	Normal
02:00	1.06 s	Normal
02:30	798 ms	Normal
03:00	1.15 s	Normal
03:30	3.67 s	Much slower, or failing
04:00	1.26 s	Normal
04:30	1.15 s	Normal
05:00	1.50 s	Normal
05:30	1.16 s	Normal
06:00	2.06 s	Slower than usual
06:30	1.27 s	Normal
07:00	1.36 s	Normal
07:30	1.42 s	Normal
08:00	703 ms	Normal
08:30	1.21 s	Normal

Montreal

Each check (UTC)Usual (1.18 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
00:30	1.14 s	Normal
01:00	1.79 s	Slower than usual
01:30	1.12 s	Normal
02:00	1.02 s	Normal
02:30	1.02 s	Normal
03:00	1.18 s	Normal
03:30	3.59 s	Much slower, or failing
04:00	1.05 s	Normal
04:30	1.06 s	Normal
05:00	1.12 s	Normal
05:30	1.38 s	Normal
06:00	1.18 s	Normal
06:30	1.20 s	Normal
07:00	1.79 s	Slower than usual
07:30	1.10 s	Normal
08:00	1.29 s	Normal
08:30	1.19 s	Normal

Singapore

Each check (UTC)Usual (1.24 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
00:30	1.19 s	Normal
01:00	2.06 s	Slower than usual
01:30	1.28 s	Normal
02:00	1.26 s	Normal
02:30	1.20 s	Normal
03:00	1.56 s	Normal
03:30	4.15 s	Much slower, or failing
04:00	1.34 s	Normal
04:30	1.35 s	Normal
05:00	1.08 s	Normal
05:30	1.39 s	Normal
06:00	1.18 s	Normal
06:30	1.22 s	Normal
07:00	1.82 s	Normal
07:30	1.76 s	Normal
08:00	1.62 s	Normal
08:30	1.29 s	Normal

Tokyo

Each check (UTC)Usual (1.18 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
00:30	1.05 s	Normal
01:00	2.16 s	Slower than usual
01:30	1.60 s	Normal
02:00	1.53 s	Normal
02:30	1.76 s	Slower than usual
03:00	1.18 s	Normal
03:30	4.41 s	Much slower, or failing
04:00	1.16 s	Normal
04:30	1.31 s	Normal
05:00	1.57 s	Normal
05:30	1.48 s	Normal
06:00	1.60 s	Normal
06:30	1.29 s	Normal
07:00	944 ms	Normal
07:30	1.42 s	Normal
08:00	1.17 s	Normal
08:30	1.39 s	Normal

Mumbai

Each check (UTC)Usual (1.55 s)Much slower, or failingIncident

Every check as a table

Time (UTC)	Check	Reading
00:30	1.42 s	Normal
01:00	1.89 s	Normal
01:30	1.38 s	Normal
02:00	1.16 s	Normal
02:30	1.65 s	Normal
03:00	1.42 s	Normal
03:30	3.88 s	Much slower, or failing
04:00	1.68 s	Normal
04:30	1.35 s	Normal
05:00	1.88 s	Normal
05:30	1.28 s	Normal
06:00	2.05 s	Normal
06:30	1.38 s	Normal
07:00	1.41 s	Normal
07:30	1.85 s	Normal
08:00	1.50 s	Normal
08:30	1.41 s	Normal

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