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October 25, 2026
6 min read
Opinion

Kimi K3.1 Pro and the November 4 Open-Weight Date Are Worth Watching

Moonshot's Kimi K3.1 Pro went live on API, fast variant included, scoring 55 on Artificial Analysis just behind Claude Opus 5.5. The company also promised to open-source the full weights by November 4. That date is the real news.

An open-weight model that strong changes the math for teams that cannot send data to someone else's API. The 'good enough and free to run' layer is filling in, and Kimi is a serious entry.

I am not going to pretend open weights beat the frontier. They do not. But they beat the frontier on the one axis that matters for private work, and that is where most production lives.

Mark November 4. If Kimi ships what it promised, the 'should I self-host' conversation gets a lot more practical for a lot more teams.

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