Claude Opus 4.1 · model releaseClaude Opus 4.1

validasserted

Valid from: 2025-08-05
Valid until: still holds
Published: no source on record carries a date
Recorded by AsOf: 2026-11-04
Checked: 2026-11-04 · its source page states the value and the date
Confidence: 0.95

Sources

“August 5, 2025 We’ve launched Claude Opus 4.1 , an incremental update to Claude Opus 4 with enhanced capabilities and performance improvements.”— what the page says, read 2026-11-04

https://platform.claude.com/docs/en/release-notes/overviewprimary · platform.claude.com

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