Anthropic has confirmed that multiple Claude models are experiencing degraded performance, with the outage affecting Mythos 5, Fable 5, Opus 5, and Sonnet 5. According to the Claude status page, the outage started early this morning around 3:00 AM ET. Anthropic says it has implemented a fix and is currently monitoring for recovery. In the most recent report, the company stated it has identified the cause of elevated errors for Claude Opus 5 and is working on a fix for that model.