Moonshot AI Launches Kimi K3.1 Pro With Open-Sourced Weights Set for November 4
Moonshot AI has released Kimi K3.1 Pro, the first model in its K3.1 series, alongside a high-speed variant that runs 2 to 3 times faster than the standard version. Both models support a 1-million-token context window and are now accessible via Kimi.ai, Kimi Work, Kimi Code, and API endpoints.
On Terminal-Bench 4.0, K3.1 Pro scored 65.70%, surpassing GPT-6 Astra's 58.20% and trailing Claude Opus 5.5's 66.40%. In an internal hallucination test, the rate for individual statements dropped from 23.40% with the previous K3 model to 8.30%. Full model weights are scheduled for open-source release by November 4.
