Outage in Anthropic

Elevated errors on Claude 4 Sonnet

Resolved Major
July 23, 2025 - Started 3 months ago - Lasted about 1 hour
Official incident page

Incident Report

We are investigating an issue on Claude 4 Sonnet that started at 6:04 PT / 13:04 UTC.

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Latest Updates ( sorted recent to last )
RESOLVED 3 months ago - at 07/23/2025 02:43PM

We've seen two big spikes of errors, one between 13:05 UTC and 13:24 UTC, and another one between 13:50 UTC and 14:18 UTC. The issue has now been resolved.

IDENTIFIED 3 months ago - at 07/23/2025 01:26PM

The issue has been identified and a fix is being implemented.

INVESTIGATING 3 months ago - at 07/23/2025 01:20PM

We are investigating an issue on Claude 4 Sonnet that started at 6:04 PT / 13:04 UTC.

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