# Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1 > Source: > Published: 2026-09-11 14:37:11+00:00 Sep `11`, `14:37` UTC **Resolved** - The issue affecting Claude services has been resolved. Impact occurred from 13:57 to 14:20 UTC Sep `11`, `14:28` UTC **Update** - A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery. Sep `11`, `14:28` UTC **Monitoring** - A fix has been deployed for Claude Mythos 5.1 and Claude Fable 5.1 and we are monitoring for recovery. Sep `11`, `14:21` UTC **Identified** - We have identified the cause of elevated errors on requests to Claude Mythos 5.1 and Claude Fable 5.1 and are working on a fix. We will provide an update as soon as possible. Sep `11`, `14:19` UTC **Investigating** - We are investigating elevated errors on requests to Claude Fable 5.1 and Claude Mythos 5.1. We will provide an update as soon as possible.