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Claude API slowdown on 5 October 2026

Claude API from Mumbai, Tokyo, Montreal: slower than usual; 2026-10-05 21:00 UTC to 2026-10-06 00:00 UTC: peak first visible token 2.94 s vs a usual 1.11 s.

What our checks saw
Slower than usual
Cities affected
Mumbai, Tokyo, Montreal
When
to
How long
3 hours
Slowest check
2.94 s, usually 1.11 s
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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: Amsterdam, San Francisco, Singapore.

Montreal

Incident0 ms3.00 s6.00 s18:0021:0000:0003:00
Each check (UTC)Usual (1.11 s)Slower than usualMuch slower, or failingSlow check outside the incidentIncident
Every check as a table
Time (UTC)CheckReading
18:00858 msNormal
18:301.15 sNormal
19:001.95 sSlower than usual
19:301.30 sNormal
20:00896 msNormal
20:301.83 sSlower than usual
21:002.00 sSlower than usual
21:301.06 sNormal
22:004.82 sMuch slower, or failing
22:301.05 sNormal
23:001.17 sNormal
23:301.04 sNormal
00:001.13 sNormal
00:301.03 sNormal
01:001.01 sNormal
01:301.17 sNormal
02:001.94 sSlower than usual
02:30974 msNormal
03:001.11 sNormal

Tokyo

Incident0 ms2.00 s4.00 s18:0021:0000:0003:00
Each check (UTC)Usual (1.17 s)Much slower, or failingSlow check outside the incidentIncident
Every check as a table
Time (UTC)CheckReading
18:002.04 sSlower than usual
18:30962 msNormal
19:002.10 sSlower than usual
19:30870 msNormal
20:002.11 sSlower than usual
20:301.18 sNormal
21:002.99 sMuch slower, or failing
21:301.02 sNormal
22:00928 msNormal
22:301.14 sNormal
23:001.25 sNormal
23:301.13 sNormal
00:001.39 sNormal
00:301.11 sNormal
01:001.14 sNormal
01:301.32 sNormal
02:003.04 sMuch slower, or failing
02:301.12 sNormal
03:001.26 sNormal

Mumbai

Incident0 ms1.25 s2.50 s18:0021:0000:0003:00
Each check (UTC)Usual (1.28 s)Slower than usualSlow check outside the incidentIncident
Every check as a table
Time (UTC)CheckReading
18:001.02 sNormal
18:301.47 sNormal
19:002.17 sSlower than usual
19:302.10 sSlower than usual
20:001.07 sNormal
20:302.07 sSlower than usual
21:002.07 sSlower than usual
21:301.69 sNormal
22:001.06 sNormal
22:301.26 sNormal
23:001.92 sNormal
23:301.33 sNormal
00:001.33 sNormal
00:301.21 sNormal
01:001.28 sNormal
01:301.46 sNormal
02:001.68 sNormal
02:301.21 sNormal
03:001.28 sNormal

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