Moonshot's Kimi K3.1 Pro Launches as Fourth-Ranked LLM with 2.8T Parameters and 1M Context

Moonshot AI released Kimi K3.1 Pro on October 23, 2026, a 2.8-trillion-parameter mixture-of-experts model with 1 million tokens of context that immediately ranked fourth on the Artificial Analysis Intelligence Index. The model, which combines 104 billion active parameters per token with substantial post-training reinforcement learning, is available now via Kimi.ai, mobile applications, Kimi Work, Kimi Code, and the Kimi API. Full open weights are scheduled for November 4, 2026.