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ChatGPT API slowdown on 6 October 2026

ChatGPT API from Amsterdam, Mumbai, Singapore, Tokyo, Montreal: slower than usual; 2026-10-06 19:00 UTC to 2026-10-07 00:30 UTC: peak first visible token 3.56 s vs a usual 1.58 s.

What our checks saw
Slower than usual
Cities affected
Amsterdam, Mumbai, Singapore, Tokyo, Montreal
When
to
How long
5.5 hours
Slowest check
3.56 s, usually 1.58 s
OpenAI's status page
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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.

Amsterdam

Incident0 ms2.50 s5.00 s16:0019:0022:0001:00
Each check (UTC)Usual (1.18 s)Slower than usualMuch slower, or failingSlow check outside the incidentIncident
Every check as a table
Time (UTC)CheckReading
16:001.24 sNormal
16:301.25 sNormal
17:002.03 sSlower than usual
17:301.12 sNormal
18:001.43 sNormal
18:301.64 sNormal
19:002.39 sSlower than usual
19:301.30 sNormal
20:001.03 sNormal
20:30974 msNormal
21:001.46 sNormal
21:301.12 sNormal
22:001.21 sNormal
22:304.06 sMuch slower, or failing
23:001.15 sNormal
23:301.65 sNormal
00:001.21 sNormal
00:301.19 sNormal
01:001.07 sNormal
01:301.18 sNormal
02:001.13 sNormal
02:301.18 sNormal
03:00964 msNormal
03:301.13 sNormal

Montreal

Incident0 ms1.25 s2.50 s16:0019:0022:0001:00
Each check (UTC)Usual (1.12 s)Slower than usualIncident
Every check as a table
Time (UTC)CheckReading
16:001.20 sNormal
16:301.07 sNormal
17:001.20 sNormal
17:301.49 sNormal
18:001.33 sNormal
18:301.66 sNormal
19:002.20 sSlower than usual
19:301.24 sNormal
20:001.64 sNormal
20:301.98 sSlower than usual
21:001.98 sSlower than usual
21:301.07 sNormal
22:001.19 sNormal
22:301.11 sNormal
23:001.80 sSlower than usual
23:301.66 sNormal
00:001.24 sNormal
00:301.15 sNormal
01:00896 msNormal
01:301.14 sNormal
02:001.31 sNormal
02:301.34 sNormal
03:001.07 sNormal
03:30852 msNormal

Singapore

Incident0 ms2.50 s5.00 s16:0019:0022:0001:00
Each check (UTC)Usual (1.20 s)Much slower, or failingIncident
Every check as a table
Time (UTC)CheckReading
16:001.22 sNormal
16:30–No check
17:001.64 sNo check
17:301.20 sNormal
18:001.38 sNormal
18:301.64 sNormal
19:001.24 sNormal
19:301.31 sNormal
20:001.25 sNormal
20:301.25 sNormal
21:001.36 sNormal
21:301.25 sNormal
22:001.20 sNormal
22:304.30 sMuch slower, or failing
23:001.18 sNormal
23:301.38 sNormal
00:001.55 sNormal
00:301.34 sNormal
01:001.15 sNormal
01:301.25 sNormal
02:001.07 sNormal
02:301.60 sNormal
03:00864 msNormal
03:301.31 sNormal

Tokyo

Incident0 ms1.25 s2.50 s16:0019:0022:0001:00
Each check (UTC)Usual (1.22 s)Slower than usualIncident
Every check as a table
Time (UTC)CheckReading
16:001.15 sNormal
16:30–No check
17:001.33 sNo check
17:301.48 sNormal
18:001.53 sNormal
18:301.77 sNormal
19:002.04 sSlower than usual
19:301.32 sNormal
20:001.28 sNormal
20:301.10 sNormal
21:001.79 sNormal
21:301.25 sNormal
22:001.63 sNormal
22:301.82 sNormal
23:001.81 sNormal
23:30914 msNormal
00:001.28 sNormal
00:30883 msNormal
01:001.44 sNormal
01:301.38 sNormal
02:001.16 sNormal
02:301.69 sNormal
03:001.27 sNormal
03:301.14 sNormal

Mumbai

Incident0 ms3.00 s6.00 s16:0019:0022:0001:00
Each check (UTC)Usual (1.58 s)Much slower, or failingIncident
Every check as a table
Time (UTC)CheckReading
16:002.10 sNormal
16:30–No check
17:001.75 sNo check
17:301.67 sNormal
18:001.57 sNormal
18:301.80 sNormal
19:002.04 sNormal
19:302.11 sNormal
20:001.51 sNormal
20:301.28 sNormal
21:001.46 sNormal
21:301.78 sNormal
22:001.64 sNormal
22:305.23 sMuch slower, or failing
23:001.89 sNormal
23:301.97 sNormal
00:002.25 sNormal
00:301.45 sNormal
01:001.39 sNormal
01:301.30 sNormal
02:001.43 sNormal
02:301.83 sNormal
03:001.70 sNormal
03:301.61 sNormal

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