The open-weight race just got a lot closer. On October 23, 2026 , Chinese AI lab Moonshot AI released Kimi K3.1 Pro , the first model in its new K3.1 series — and the first independent scoreboard put it fourth in the world, within three points of the best proprietary model on the planet.

Moonshot calls it "our most capable 3T-class open-weight model to date," and the headline spec is a 1-million-token context window — enough to hold an entire codebase, a shelf of financial filings, or a long research project in a single conversation. A faster sibling, Kimi K3.1 Pro Highspeed , launched the same day.…