Changes / Anthropic / Elevated errors for Claude Sonnet 5
Anthropic: Major incident: Elevated errors for Claude Sonnet 5
Summary
Claude Sonnet 5 requests experienced elevated errors across claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork, with major impact. The incident started at 2026-09-03 12:37 UTC and was resolved at 2026-09-03 12:56 UTC; the reported duration was 18 min. Anthropic implemented a fix and monitored results before resolution.
Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.
What changed
Before: not present
After: Elevated errors for Claude Sonnet 5
Before: not present
After: major
Before: not present
After: resolved
Before: not present
After: 2026-09-03 12:37 UTC
Before: not present
After: 2026-09-03 12:56 UTC
Before: not present
After: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
Before: not present
After: We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.
Before: not present
After: A fix has been implemented and we are monitoring the results.
Before: not present
After: This incident has been resolved.
First version of this incident archived by Rewindex. View the live incident.
History of this incident
| When (UTC) | Change | Kind |
|---|---|---|
| Major incident: Elevated errors for Claude Sonnet 5 (this change) Claude Sonnet 5 requests experienced elevated errors across claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork, with major impact. The incident started at 2026-09-03 12:37 UTC and was resolved at 2026-09-03 12:56 UTC; the reported duration was 18 min. Anthropic implemented a fix and monitored results before resolution. | Major incident |
All Anthropic changes → · Anthropic profile · Markdown · JSON