Claude Opus 4.1 Released
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins89% CONFIDENCEOverall confidence: 89%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or betterAnthropic's[1][3] post is dated "Aug 5, 2025": "Today we're releasing Claude[2][4] Opus 4.1 ... now available to paid Claude users and in Claude Code. It's also on our API, Amazon Bedrock, and Google Cloud's Vertex AI"; the Claude release notes and GitHub's[5] changelog carry the same date.
Anthropic releases Claude Opus 4.1, an upgrade to Claude Opus 4 that raises its SWE-bench Verified coding score to 74.5% at the same price, on the day OpenAI released its first open-weight models since 2019.