Elevated errors on Claude Sonnet 4.6

lowAnthropicClaude APIMar 3, 2026 15:40Duration: 2h 15m

api

API Issue

Summary

This incident has been resolved.

Impact

minor

Timeline

Feb 18, 2026 13:20

[investigating] We are currently investigating this issue.

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+9m

Feb 18, 2026 13:29

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

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+53m

Feb 18, 2026 14:22

[monitoring] A fix has been implemented and we are monitoring the results.

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+1h 13m

Feb 18, 2026 15:35

[resolved] This incident has been resolved.

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+135h 47m

Feb 24, 2026 07:22

[investigating] We are currently investigating this issue.

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+19m

Feb 24, 2026 07:41

[resolved] As of 23:27 PT / 7:27 UTC the errors are back to the baseline.

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+4h 41m

Feb 24, 2026 12:22

[investigating] We are currently investigating this issue.

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+38m

Feb 24, 2026 13:00

[investigating] Previously this incident named Sonnet 4.5 as the affected model. This is a mistake and the model affected is Sonnet 4.6. Sorry.

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+26m

Feb 24, 2026 13:26

[resolved] As of 5:10 PT / 13:10 UTC errors are back to baseline.

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+170h 14m

Mar 3, 2026 15:40

[investigating] We are currently investigating this issue.

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+59m

Mar 3, 2026 16:38

[resolved] This incident has been resolved.

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Lessons Learned

⚠Anthropic has experienced 33 incidents in the past year. This frequency suggests systemic reliability challenges that may warrant additional monitoring.

📊Incidents related to api have occurred 182 times across all providers in the past year. This is one of the most common failure categories in cloud infrastructure.

💡This incident is categorized as: API Issue. Consider implementing preventive measures specific to this failure category.