Past incident

Elevated errors for Claude Sonnet 5.5 and other models

Claude / Anthropic · Major · Started

Duration
Unavailable
Severity
Major
Status
No longer listed as active

Summary

Major · No longer listed as active

A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

View official incident ↗

Event timeline

How this incident unfolded, from the official status page.

  1. Investigating

    Claude / Anthropic

    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.

  2. Identified

    Claude / Anthropic

    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.

  3. Monitoring

    Claude / Anthropic

    A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.