Claude API disruption on 20 October 2026

Claude API from Amsterdam, Mumbai, San Francisco, Singapore, Tokyo, Montreal: degraded checks; 2026-10-20 05:00 UTC to 2026-10-20 07:30 UTC: peak first visible token 14.2 s vs a usual 1.01 s.

What our checks saw: Degraded
Cities affected: Amsterdam, Mumbai, San Francisco, Singapore, Tokyo, Montreal
When: 20 Oct, 05:00 UTC to 20 Oct, 07:30 UTC
How long: 2.5 hours
Slowest check: 14.20 s, usually 1.01 s
Anthropic'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 (1.01 s)Slower than usualMuch slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
02:00	1.06 s	Normal
02:30	982 ms	Normal
03:00	950 ms	Normal
03:30	1.02 s	Normal
04:00	957 ms	Normal
04:30	955 ms	Normal
05:00	9.38 s	Much slower, or failing
05:30	1.61 s	Slower than usual
06:00	1.42 s	Normal
06:30	1.22 s	Normal
07:00	1.05 s	Normal
07:30	1.34 s	Normal
08:00	1.18 s	Normal
08:30	2.06 s	Slower than usual
09:00	1.31 s	Normal
09:30	1.11 s	Normal
10:00	1.16 s	Normal
10:30	990 ms	Normal

San Francisco

Each check (UTC)Usual (927 ms)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
02:00	948 ms	Normal
02:30	907 ms	Normal
03:00	905 ms	Normal
03:30	972 ms	Normal
04:00	–	No check
04:30	904 ms	No check
05:00	14.32 s	Much slower, or failing
05:30	1.16 s	Normal
06:00	1.23 s	Normal
06:30	1.02 s	Normal
07:00	1.00 s	Normal
07:30	1.21 s	Normal
08:00	1.01 s	Normal
08:30	4.70 s	Much slower, or failing
09:00	1.26 s	Normal
09:30	982 ms	Normal
10:00	1.06 s	Normal
10:30	960 ms	Normal

Montreal

Each check (UTC)Usual (906 ms)Slower than usualMuch slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
02:00	878 ms	Normal
02:30	863 ms	Normal
03:00	898 ms	Normal
03:30	865 ms	Normal
04:00	896 ms	Normal
04:30	853 ms	Normal
05:00	10.14 s	Much slower, or failing
05:30	1.63 s	Slower than usual
06:00	995 ms	Normal
06:30	1.09 s	Normal
07:00	1.02 s	Normal
07:30	1.02 s	Normal
08:00	1.23 s	Normal
08:30	2.04 s	Slower than usual
09:00	1.10 s	Normal
09:30	928 ms	Normal
10:00	984 ms	Normal
10:30	980 ms	Normal

Singapore

Each check (UTC)Usual (1.09 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
02:00	1.03 s	Normal
02:30	1.07 s	Normal
03:00	1.25 s	Normal
03:30	1.06 s	Normal
04:00	1.03 s	Normal
04:30	1.02 s	Normal
05:00	10.15 s	Much slower, or failing
05:30	1.39 s	Normal
06:00	1.27 s	Normal
06:30	1.21 s	Normal
07:00	1.18 s	Normal
07:30	1.36 s	Normal
08:00	1.17 s	Normal
08:30	4.64 s	Much slower, or failing
09:00	2.83 s	Much slower, or failing
09:30	1.12 s	Normal
10:00	1.21 s	Normal
10:30	1.13 s	Normal

Tokyo

Each check (UTC)Usual (1.01 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
02:00	1.00 s	Normal
02:30	992 ms	Normal
03:00	988 ms	Normal
03:30	992 ms	Normal
04:00	991 ms	Normal
04:30	977 ms	Normal
05:00	14.12 s	Much slower, or failing
05:30	14.27 s	Much slower, or failing
06:00	1.19 s	Normal
06:30	1.09 s	Normal
07:00	1.19 s	Normal
07:30	1.23 s	Normal
08:00	1.11 s	Normal
08:30	4.62 s	Much slower, or failing
09:00	1.36 s	Normal
09:30	1.04 s	Normal
10:00	1.11 s	Normal
10:30	1.07 s	Normal

Mumbai

Each check (UTC)Usual (1.12 s)Much slower, or failingSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
02:00	1.10 s	Normal
02:30	1.06 s	Normal
03:00	1.12 s	Normal
03:30	1.09 s	Normal
04:00	1.09 s	Normal
04:30	1.09 s	Normal
05:00	9.28 s	Much slower, or failing
05:30	1.28 s	Normal
06:00	1.30 s	Normal
06:30	1.19 s	Normal
07:00	1.21 s	Normal
07:30	1.40 s	Normal
08:00	1.21 s	Normal
08:30	4.45 s	Much slower, or failing
09:00	1.46 s	Normal
09:30	1.18 s	Normal
10:00	1.26 s	Normal
10:30	1.26 s	Normal

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