Outage in Anthropic
Elevated error rates on Claude Opus and Sonnet 4.6
Resolved MajorIncident 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.
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Latest Updates ( sorted recent to last )
RESOLVED
29 days ago - at 03/21/2026 01:42AM
This incident has been resolved.
IDENTIFIED
29 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
29 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
29 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
Failures to add Credentials to Vaults - 2 days ago
Claude Cowork not starting for some users - 2 days ago
Opus 4.6 elevated rate of errors - 3 days ago
Elevated errors on Claude.ai, API, Claude Code - 4 days ago
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