Changes / Claude / Elevated errors for Claude Sonnet 5
Claude: 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 in a major-impact incident starting 2026-09-03 12:37 UTC. A fix was implemented by 12:47 UTC; the incident was resolved at 2026-09-03 12:56 UTC, with a reported duration of 18 min.
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
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After: major
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After: resolved
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After: 2026-09-03 12:37 UTC
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After: 2026-09-03 12:56 UTC
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After: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
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After: We are investigating elevated errors on requests to Claude Sonnet 5. We will provide an update as soon as possible.
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After: A fix has been implemented and we are monitoring the results.
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After: This incident has been resolved.
First version of this incident archived by Rewindex. View the live incident (opens in new tab).
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 in a major-impact incident starting 2026-09-03 12:37 UTC. A fix was implemented by 12:47 UTC; the incident was resolved at 2026-09-03 12:56 UTC, with a reported duration of 18 min. | Major incident |