Anthropic incident

Elevated errors for Claude Sonnet 5

Major Resolved View vendor source →

Anthropic experienced a major incident on September 3, 2026 affecting claude.ai and Claude API (api.anthropic.com) and 1 more component, lasting 18m. The incident has been resolved; the full update timeline is below.

Started
Sep 03, 2026, 12:37 PM UTC
Resolved
Sep 03, 2026, 12:56 PM UTC
Duration
18m
Detected by Pingoru
Sep 03, 2026, 12:37 PM UTC

Affected components

claude.aiClaude API (api.anthropic.com)Claude CodeClaude Cowork

Update timeline

  1. investigating Sep 03, 2026, 12:37 PM UTC

    We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.

  2. monitoring Sep 03, 2026, 12:47 PM UTC

    A fix has been implemented and we are monitoring the results.

  3. resolved Sep 03, 2026, 12:56 PM UTC

    This incident has been resolved.