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anthropic

Elevated errors on Claude Opus 4.5 and Sonnet 4.5

Status: unknown | Severity: degraded

Cite this incident

Timeline

Started: 2026-01-20T16:41:32.841Z

Updated: 2026-01-20T18:00:59.077Z

Resolved: 2026-01-20T17:34:55.095Z

Impact scope

Impacted regions: None reported

Impacted models: None reported

Impacted components: rwppv331jlwc, 0qbwn08sd68x, k8w3r06qmzrp, yyzkbfz2thpt

Official sources

Provider: anthropic

View official incident page

Updates

  • unknown

    On January 20, 2026, between 8:31 AM and 9:29 AM PT, customers experienced elevated error rates when using Claude Sonnet 4.5 and Claude Opus 4.5 models. The issue was caused by a newly enabled feature that triggered unexpected failures in our inference infrastructure. We identified and disabled the problematic feature, restoring normal service within 45 minutes.

    2026-01-20T18:00:23.031Z

  • resolved

    This incident has been resolved.

    2026-01-20T17:34:55.095Z

  • identified

    The issue has been identified and a fix is being implemented.

    2026-01-20T17:20:16.983Z

  • investigating

    We are currently investigating this issue.

    2026-01-20T16:41:32.974Z