๐ฅKimi is SO BACK!! and -
3.1 is a strong reminder that the interesting scaling story in 2026 is no longer just pre-training FLOPs. This is the same 2.8T / 104B-active MoE as K3 (896 routed experts, 16 active + 2 shared, 69 KDA + 24 Gated MLA layers, AttnRes, Stable LatentMoE, native MXFP4), but the gains come from substantially larger post-training compute and large-scale joint RL across hundreds of domains.
The result is a model that can write/iteratively debug its own Blender/CAD scripts, assemble full game projects in Unreal/Unity/Godot, and produce linked financial models with meaningfully lower hallucination rates. On Terminal-Bench 4.0 it sits at 65.7% (between GPT-6 Astra & Opus 5.5), & it leads several long-horizon agent + coding metrics. ๐
The open-weight date (Nov 4) is welcome, but the practical constraint is still the same: even with extreme sparsity + MXFP4, this is a supernode-class model. The real test will be how well the post-training stack transfers when the community starts fine-tuning and running it under its own constraints. All amazing stuff ๐
Introducing Kimi K3.1 Pro: our most capable 3T-class open-weight model.
๐น 1M-token context, 2.8T total / 104B active params (MoE), Multimodal.
๐น Full-project coding: games in Unreal, Unity & Godot.
๐น Excels at parametric 3D modeling in Blender & CAD.
๐น More reliable at finance work: Accurate modeling with hallucination down by 65%.
๐น Matching the strongest proprietary models across coding, agentic and knowledge benchmarks.
Kimi K3.1 Pro and K3.1 Pro Highspeed (2โ3ร faster) are now live on Kimi Work, Kimi Code, and the Kimi API.
Open weights by Nov 4, 2026.
๐ API:
๐ Tech blog: