Degraded performance for Claude Fable 5.1
minor- Started
- Nov 8, 3:28 AM EST
- Resolved
- Nov 8, 3:54 AM EST
- Duration
- 26 min
Anthropic's updates (3)
- investigating · Nov 8, 3:28 AM EST
We are investigating elevated errors on requests to Claude Fable 5.1. We will provide an update as soon as possible.
- monitoring · Nov 8, 3:39 AM EST
A fix has been deployed for Claude Fable 5.1 and we are monitoring for recovery.
- resolved · Nov 8, 3:54 AM EST
The issue affecting claude.ai, the Claude API, Claude Code, and Claude Cowork has been resolved. Impact occurred from 00:18 PT / 08:18 UTC on Nov 8 to 00:32 PT / 08:32 UTC on Nov 8.
What our checks recorded
We checked Claude 5 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 197 ms, against 185 ms over the 24 hours before. Anthropic posted the incident at Nov 8, 3:28 AM EST.
Updates are Anthropic's own words from its status page (status: resolved); we never add an inferred cause. The vendor's incident page ↗