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[ARTICLE · art-16264] src=status.claude.com pub= topic=large-language-models verified=true sentiment=↓ negative

Elevated error rates on requests to some models

Anthropic resolved elevated error rates on requests to Claude Opus 4.6 and Sonnet 4.6 models on May 15, after identifying and addressing the issue that began around midnight UTC. The company confirmed that success rates for Opus 4.7 returned to normal during the incident, while teams worked to restore full functionality for the affected models.

read1 min publishedMay 15, 2026

May 15, 01:46 UTC

Resolved - This incident has been resolved.

May 15, 01:26 UTC

Update - We are working to resolve errors impacting Claude Opus 4.6, and have seen both Sonnet 4.6 and Opus 4.7 return to normal success rates.

May 15, 01:06 UTC

Identified - We are currently working to resolve issues affecting requests to Claude Opus and Sonnet 4.6, though success rates for Opus 4.7 have returned to normal.

May 15, 00:19 UTC

Update - We are continuing to investigate this issue.

May 15, 00:18 UTC

Investigating - We are currently investigating this issue.

source & further reading
status.claude.com — original article
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