Outage in Anthropic

Elevated error rates on Claude Opus and Sonnet 4.6

Resolved Major

March 21, 2026 - Started 2 days ago - Lasted about 2 hours
Official incident page

Incident Report

Summary AI Generated

Anthropic experienced elevated error rates affecting Claude Opus and Sonnet 4.6 models across claude.ai, console.anthropic.com, and api.anthropic.com for 1.6 hours. The team identified the underlying issue and restored Claude Opus 4.6 to normal success rates first, followed by full resolution of errors for Claude Sonnet 4.6. The incident was fully resolved with all services returning to normal operation.

We are currently investigating elevated error rates affecting Claude Opus 4.6. Our team is actively working to identify the root cause.

Components affected

Anthropic claude.ai Anthropic console.anthropic.com Anthropic api.anthropic.com

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Latest Updates ( sorted recent to last )

RESOLVED 2 days ago - at 03/21/2026 01:42AM

This incident has been resolved.

IDENTIFIED 2 days ago - at 03/21/2026 12:58AM

We have observed success rates return to normal for Claude Opus 4.6, and are working to fully resolve elevated errors for Claude Sonnet 4.6.

IDENTIFIED 2 days ago - at 03/21/2026 12:17AM

We have identified an issue resulting in elevated errors on both Claude Opus and Sonnet 4.6, and are working to resolve this issue as quickly as possible.

INVESTIGATING 2 days ago - at 03/21/2026 12:07AM

We are currently investigating elevated error rates affecting Claude Opus 4.6. Our team is actively working to identify the root cause.

Latest Anthropic outages

Claude.ai and Claude login down - about 15 hours ago

Delayed response completion on Claude.ai - about 22 hours ago

Elevated errors on Claude Opus 4.6 - 4 days ago

Elevated errors on Claude Sonnet 4.6 - 4 days ago

Elevated errors across surfaces - 4 days ago

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