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Anthropic · AINov 20, 2025, 08:10 UTC 11 months ago

Elevated errors on Sonnet 4, Sonnet 4.5 and Haiku 4.5

MajorNot disclosedUpdated 47d ago
Nov 20, 08:10 UTCNov 20, 12:03 UTC
Duration
3h 53m
Impact
Major
Root cause
Not disclosed
Anthropic, 90 days
49 incidents
Affected
Not listed by the vendor.
Status page

Final update

As of 3:55 PT / 11:55 UTC the level of errors on Sonnet 4.0 has returned to normal.

Timeline

  1. Resolved · Nov 20, 12:03 UTC
    As of 3:55 PT / 11:55 UTC the level of errors on Sonnet 4.0 has returned to normal.

More from Anthropic

Full history