Moonshot AI Opens Kimi K3.1 Pro Weights: 2.8T Parameters, 1M Context, Plus Hosted Agents
Moonshot AI (Kimi) released the full model weights of Kimi K3.1 Pro on November 5 and detailed them through November 8, making it one of the largest open-weight models available. The model uses a mixture-of-experts architecture with 2.8 trillion total parameters and about 104 billion activated per request, a 1-million-token context window and native multimodal vision. On Arena's Agent Arena it ranks first among open-weight models and 13th overall, leading open models in work, coding and chat. Moonshot simultaneously launched Kimi Hosted Agents, a cloud service that runs agent frameworks with 7x24 managed execution, multi-agent collaboration and access to 140-plus skills, letting enterprises deploy long-horizon tasks without building their own infrastructure.
Source: The Paper / NetEase / Kimi, Nov 5-8, 2026 | 2026-11-08
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