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Claude API slowdown on 22 October 2026

Claude API from San Francisco, Singapore, Tokyo: slower than usual; 2026-10-22 16:30 UTC to 2026-10-22 18:30 UTC: peak first visible token 1.62 s vs a usual 1.07 s.

What our checks saw
Slower than usual
Cities affected
San Francisco, Singapore, Tokyo
When
to
How long
2 hours
Slowest check
1.62 s, usually 1.07 s
Anthropic'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: Amsterdam, Montreal, Mumbai.

San Francisco

Incident0 ms1.00 s2.00 s13:3016:3019:30
Each check (UTC)Usual (916 ms)Slower than usualSlow check outside the incidentIncident
Every check as a table
Time (UTC)CheckReading
13:301.14 sNormal
14:001.54 sSlower than usual
14:301.17 sNormal
15:001.12 sNormal
15:301.31 sNormal
16:001.41 sSlower than usual
16:301.55 sSlower than usual
17:001.25 sNormal
17:30999 msNormal
18:001.67 sSlower than usual
18:301.03 sNormal
19:001.04 sNormal
19:301.16 sNormal
20:001.01 sNormal
20:30972 msNormal
21:00992 msNormal
21:301.05 sNormal

Singapore

Incident0 ms1.00 s2.00 s13:3016:3019:30
Each check (UTC)Usual (1.07 s)Slower than usualSlow check outside the incidentIncident
Every check as a table
Time (UTC)CheckReading
13:301.29 sNormal
14:001.62 sSlower than usual
14:301.35 sNormal
15:001.45 sNormal
15:301.25 sNormal
16:001.49 sNormal
16:301.75 sSlower than usual
17:001.25 sNormal
17:301.19 sNormal
18:001.51 sNormal
18:301.19 sNormal
19:001.20 sNormal
19:301.13 sNormal
20:001.24 sNormal
20:301.08 sNormal
21:001.14 sNormal
21:301.14 sNormal

Tokyo

Incident0 ms1.00 s2.00 s13:3016:3019:30
Each check (UTC)Usual (998 ms)Slower than usualIncident
Every check as a table
Time (UTC)CheckReading
13:301.31 sNormal
14:001.44 sNormal
14:301.16 sNormal
15:001.28 sNormal
15:301.19 sNormal
16:001.44 sNormal
16:301.61 sSlower than usual
17:001.35 sNormal
17:301.12 sNormal
18:001.70 sSlower than usual
18:301.13 sNormal
19:001.16 sNormal
19:301.09 sNormal
20:001.09 sNormal
20:301.04 sNormal
21:001.02 sNormal
21:30987 msNormal

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