Kimi Releases 2.8T Flagship K3.1 Pro, Tops SWE Marathon with a Score of 51.7
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Kimi has released its multimodal flagship model K3.1 Pro, with 2.8T total parameters and 104B active parameters (MoE), and a standard 1M-token context window. The author says it tops the SWE Marathon leaderboard with a score of 51.7, overtaking Opus 5.5 and GPT-6 Astra, and the company has also promised to open-source the full weights by November 4. K3.1 Pro and K3.1 Pro Highspeed, which is 2–3× faster, are now live on the Kimi web app, Kimi Work, Kimi Code and the Kimi API.
Why read this
SelectedAI score 84
Kimi K3.1 Pro, with 2.8T total parameters and a 1M context, benchmarks against closed-source flagships and promises to open-source the full weights by November 4, giving readers a basis to judge the competitive position of the open-source camp.
Topics
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
Body
Damn! 太炸裂了，Kimi 刚刚突袭发布的 2.8T 旗舰 K3.1 Pro，SWE Marathon 拿下 51.7 登顶第一，正面反超 Opus 5.5 与 GPT-6 Astra！
而且刚刚放出的这张跑分战报，把整个大模型闭源阵营的防线打穿了一大半🤯。。
官方正式端出多模态新旗舰 K3.1 Pro：总参数量直接堆到了 2.8T，标配 1M 原生上下文窗口。
但在我看来，2.8T 这个数字或许只是表面肌肉，整篇公告里真正具备杀伤力的是两件事： 第一，在最具含金量的代码和长程智能体测试里，它正面咬住了 Opus 5.5，甚至反超了 GPT-6 Astra。
第二，官方直接白纸黑字承诺，11 月 4 日前把完整权重全盘开源。
很多人看跑分只盯着总榜看热闹，但仔细拆解这张基准表，有三场关键战役直接决定了接下来的工程落地走向：