Kimi Releases K3.1 Pro: A 2.8T Total-Parameter, 104B Active MoE Open-Source Model
Kimi officially released Kimi K3.1 Pro, a 3T-class open-weight model built on a MoE architecture with 2.8T total parameters and 104B active parameters, supporting a 1M-token context and multimodality. The company says it performs comparably to leading models such as Opus 5.5 and GPT-6 Astra on benchmarks while costing significantly less, and that hallucinations in financial modeling scenarios dropped by 65%. Kimi K3.1 Pro and K3.1 Pro Highspeed, which is 2–3× faster, are now available on the Kimi platform, Kimi Work, Kimi Code, and the Kimi API, with open weights to be released on November 4.
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Kimi K3.1 Pro, with its MoE architecture of 2.8T total parameters and 104B active parameters, benchmarks against leading proprietary models and provides a timeline for open weights.
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View original postIntroducing 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 https://t.co/85jA71X9gw, Kimi Work, Kimi Code, and the Kimi API. Open weights by Nov 4, 2026. 🔗 API: https://t.co/XCrgjXAqMw 🔗 Tech blog: https://t.co/5iPP0MBej6
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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 https://t.co/85jA71X9gw, Kimi Work, Kimi Code, and the Kimi API. Open weights by Nov 4, 2026. 🔗 API: https://t.co/XCrgjXAqMw 🔗 Tech blog: https://t.co/5iPP0MBej6
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BREAKING 🔥: Kimi AI officially announced Kimi K3.1 Pro, a 2.8T total and 104B active params MoE open model.
On benchmarks, Kimi K3.1 Pro performs on par with leading AI models like Opus 5.5 and GPT-6 Astra, while being significantly cheaper.
Open weights are coming on November 4th as well!