Elevated errors for Claude Sonnet 5.5 and other models
major- Started
- Oct 25, 2:14 AM EDT
- Resolved
- Oct 25, 3:53 AM EDT
- Duration
- 1h 39m
Anthropic's updates (4)
- investigating · Oct 25, 2:14 AM EDT
We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.
- identified · Oct 25, 2:27 AM EDT
We have identified the cause of elevated errors on requests to Claude Sonnet 5.5 and are working on a fix. We will provide an update as soon as possible.
- monitoring · Oct 25, 2:35 AM EDT
A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
- resolved · Oct 25, 3:53 AM EDT
The issue affecting Claude services has been resolved. Impact occurred from 23:05 PT on October 24 / 06:05 UTC on October 25 to 23:35 PT on October 24 / 06:35 UTC on October 25.
What our checks recorded
We checked Claude 20 times from Anthropic's start time to its resolution, once every five minutes. Every one of them reached Claude's site, so this incident did not show up as a failed page load. Our check loads the public site; it cannot see an API error or a broken feature. Median response time was 275 ms, against 247 ms over the 24 hours before. Anthropic posted the incident at Oct 25, 2:14 AM EDT.
Updates are Anthropic's own words from its status page (status: resolved); we never add an inferred cause. The vendor's incident page ↗