Claude API disruption on 20 October 2026

Claude API from Amsterdam, Mumbai, San Francisco, Singapore, Tokyo, Montreal: degraded checks; 2026-10-20 08:30 UTC to 2026-10-20 11:00 UTC: peak first visible token 3.73 s vs a usual 1.09 s.

What our checks saw: Degraded
Cities affected: Amsterdam, Mumbai, San Francisco, Singapore, Tokyo, Montreal
When: 20 Oct, 08:30 UTC to 20 Oct, 11:00 UTC
How long: 2.5 hours
Slowest check: 3.73 s, usually 1.09 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 usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
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
11:00	1.08 s	Normal
11:30	1.09 s	No check
12:00	1.16 s	No check
12:30	1.21 s	Normal
13:00	1.14 s	No check
13:30	14.70 s	No check

San Francisco

Each check (UTC)Usual (927 ms)Much slower, or failingIncident

Every check as a table

Time (UTC)	Check	Reading
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
11:00	1.12 s	Normal
11:30	1.02 s	No check
12:00	1.19 s	No check
12:30	1.06 s	Normal
13:00	1.10 s	No check
13:30	14.14 s	No check

Montreal

Each check (UTC)Usual (904 ms)Slower than usualSlow check outside the incidentIncident

Every check as a table

Time (UTC)	Check	Reading
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
11:00	1.01 s	Normal
11:30	1.14 s	No check
12:00	1.27 s	No check
12:30	982 ms	Normal
13:00	1.19 s	No check
13:30	10.60 s	No check

Singapore

Each check (UTC)Usual (1.09 s)Much slower, or failingIncident

Every check as a table

Time (UTC)	Check	Reading
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
11:00	1.23 s	Normal
11:30	1.19 s	No check
12:00	1.32 s	No check
12:30	1.22 s	Normal
13:00	1.39 s	No check
13:30	11.00 s	No check

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
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
11:00	1.15 s	Normal
11:30	1.12 s	No check
12:00	1.23 s	No check
12:30	1.19 s	Normal
13:00	1.19 s	No check
13:30	14.49 s	No check

Mumbai

Each check (UTC)Usual (1.12 s)Much slower, or failingIncident

Every check as a table

Time (UTC)	Check	Reading
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
11:00	1.18 s	Normal
11:30	1.25 s	No check
12:00	1.35 s	No check
12:30	1.30 s	Normal
13:00	1.46 s	No check
13:30	14.52 s	No check

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