ChatGPT API slowdown on 1 October 2026

ChatGPT API from Mumbai, San Francisco, Singapore, Montreal: slower than usual; 2026-10-01 08:00 UTC to 2026-10-01 10:00 UTC: peak first visible token 2.51 s vs a usual 1.56 s.

What our checks saw: Slower than usual
Cities affected: Mumbai, San Francisco, Singapore, Montreal
When: 1 Oct, 08:00 UTC to 1 Oct, 10:00 UTC
How long: 2 hours
Slowest check: 2.51 s, usually 1.56 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, Tokyo.

San Francisco

Each check (UTC)Usual (1.10 s)Slower than usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
05:00	979 ms	Normal
05:30	2.35 s	Slower than usual
06:00	1.14 s	Normal
06:30	1.15 s	Normal
07:00	1.23 s	Normal
07:30	1.12 s	Normal
08:00	2.70 s	Slower than usual
08:30	1.69 s	Slower than usual
09:00	811 ms	Normal
09:30	1.31 s	Normal
10:00	1.23 s	Normal
10:30	1.19 s	Normal
11:00	1.08 s	Normal
11:30	1.21 s	Normal
12:00	907 ms	Normal
12:30	1.18 s	Normal
13:00	1.16 s	Normal

Montreal

Each check (UTC)Usual (1.18 s)Slower than usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
05:00	1.12 s	Normal
05:30	1.57 s	Normal
06:00	1.50 s	Normal
06:30	1.03 s	Normal
07:00	632 ms	Normal
07:30	1.00 s	Normal
08:00	2.23 s	Slower than usual
08:30	1.61 s	Normal
09:00	763 ms	Normal
09:30	1.10 s	Normal
10:00	1.24 s	Normal
10:30	1.14 s	Normal
11:00	1.11 s	Normal
11:30	1.09 s	Normal
12:00	1.85 s	Slower than usual
12:30	1.27 s	Normal
13:00	1.83 s	Slower than usual

Singapore

Each check (UTC)Usual (1.23 s)Slower than usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
05:00	1.04 s	Normal
05:30	2.15 s	Slower than usual
06:00	1.22 s	Normal
06:30	1.48 s	Normal
07:00	1.64 s	Normal
07:30	1.44 s	Normal
08:00	2.31 s	Slower than usual
08:30	1.82 s	Normal
09:00	1.26 s	Normal
09:30	1.41 s	Normal
10:00	1.12 s	Normal
10:30	1.11 s	Normal
11:00	1.26 s	Normal
11:30	1.27 s	Normal
12:00	1.18 s	Normal
12:30	1.64 s	Normal
13:00	1.39 s	Normal

Mumbai

Each check (UTC)Usual (1.56 s)Slower than usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
05:00	1.48 s	Normal
05:30	2.62 s	Slower than usual
06:00	1.76 s	Normal
06:30	1.43 s	Normal
07:00	1.86 s	Normal
07:30	1.98 s	Our check could not be verified
08:00	3.03 s	Slower than usual
08:30	1.79 s	Normal
09:00	1.97 s	Normal
09:30	1.94 s	Normal
10:00	1.68 s	Normal
10:30	1.31 s	Normal
11:00	1.61 s	Normal
11:30	1.87 s	Normal
12:00	1.54 s	Normal
12:30	1.47 s	Normal
13:00	2.35 s	Slower than usual

How fast is your API around the world?

Run a free speed test from multiple cities and find out where your users are waiting. No setup, no account required.

Test my API

No account required · Takes about 30 seconds.