Moonshot AI introduces Kimi K3.1 Pro, a 3T-class open-weight model

AIMoonshot AI says Kimi K3.1 Pro is its most capable 3T-class open-weight model, with 2.8T total parameters, 104B active parameters in a mixture-of-experts design, a 1M-token context, and multimodal support. The company says it is live on Kimi.ai, Kimi Work, Kimi Code, and the Kimi API, with open weights due by November 4, 2026.

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Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.

🔹 1M-token context, 2.8T total / 104B active params (MoE), Multimodal.
🔹 Full-project coding: games in Unreal, Unity & Godot.
🔹 Excels at parametric 3D modeling in Blender & CAD.
🔹 More reliable at finance work: Accurate modeling with hallucination down by 65%.
🔹 Matching the strongest proprietary models across coding, agentic and knowledge benchmarks.

Kimi K3.1 Pro and K3.1 Pro Highspeed (2–3× faster) are now live on http://Kimi.ai, Kimi Work, Kimi Code, and the Kimi API.

Open weights by Nov 4, 2026.

🔗 API: http://platform.kimi.ai
🔗 Tech blog: http://kimi.ai/blog/kimi-k3-1-pro

Source details

Kimi.ai · x.comPublished Oct 23, 1:15 PM ET · added here 1:35 PM ET

Original title: Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.

Moonshot AI introduces Kimi K3.1 Pro, a 3T-class open-weight model

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