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kimi k3.1
Kimi K3.1 ships open 3T-scale weights, a one-million-token context window and a Highspeed mode that answers 2-3x faster.
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What Makes Kimi K3.1 Pro Different
Kimi K3.1 Pro opens the K3.1 series with a million-token context, open 3T-scale weights, and measurable leaps in coding, 3D work and finance research.
- Open 3T-scale weights, 1M-token contextAs the flagship of the K3.1 line, Kimi K3.1 Pro is Kimi's strongest open-weight release at 3T scale, holding a million tokens of context at once.
- Highspeed build, 2-3x quickerKimi K3.1 Pro Highspeed is a companion build that replies 2-3x faster than the standard model, keeping long back-and-forth sessions moving.
- Joint RL over hundreds of domainsStarting from K3 with far heavier post-training, Kimi K3.1 Pro runs large-scale joint RL across hundreds of downstream domains and lifts every one of them.
Running Kimi K3.1 Pro in Three Steps
From your first prompt to a published build in three steps with Kimi K3.1 Pro.
What Kimi K3.1 Pro Does Best
Coding agents, 3D and CAD scripting, finance workflows and carefully measured cyber limits — the areas where Kimi K3.1 Pro earns its keep.
Coding agents that stay on task
On Terminal-Bench 4.0 the model scores 65.7%, ahead of GPT-6 Astra (58.2%) and just behind Claude Opus 5.5 (66.4%), while Kimi Code Bench 3.0 Long-horizon rises to 61.2% from K3's 55.95%.
Game engines and Three.js scenes
Unity, Unreal Engine and Godot are all supported alongside web search and 3D generation, and the front-end pages it writes show tighter composition, typography and motion.
CAD scripting and parametric 3D
With tools, BenchCAD reaches 92.7%; the model also writes Blender or CAD scripts that shape assets, swap components and adjust geometry, materials and layout — no MCP connectors required.
End-to-end finance workflows
OfficeQA Pro v2 lands at 64.4, and versus K3 it gains 7.2 points on Financial Modeling, 11.6 on Financial Research and about 4.2x on Business Operation.
Accuracy that holds under stress
On the internal Kimi Hallu Bench Hard, claim-level hallucination falls from 23.4% on K3 to 8.3%, and answers carrying at least one factual slip run at 42.4% of K3's rate.
Cyber ability, deliberately bounded
Cyber data was stripped from mid-training and RL; the shipped model still clears 81.0% of xdev-bench-hard at pass@3, against 90.5% for the checkpoint without those filters.
Kimi K3.1 Pro: Questions Answered
Answers on Kimi K3.1 Pro, its Highspeed variant, when full weights land and where you can run it today.
What is Kimi K3.1 Pro, exactly?
It is Kimi's first K3.1-series release: K3 pushed through much heavier post-training, shipped as open 3T-scale weights with room for a million tokens.
How far does it pull ahead of Kimi K3?
Improvements show up across coding, agent and knowledge tests — 61.2% against 55.95% on Kimi Code Bench 3.0 Long-horizon, with hallucination cut from 23.4% to 8.3%.
When are the open weights released?
Full weights are scheduled for release by Nov 4, 2026, while hosted access through Kimi's own products is already available today.
Where can I try it right now?
Through kimi.ai and the mobile apps, in Kimi Work 3.1.0 or newer, in Kimi Code, and via the Kimi API, which offers Zero Data Retention.
Is there a faster, lower-latency option?
Yes — the Highspeed build replies 2-3x faster and can be called as kimi-k3.1-pro-highspeed on the Kimi API Platform.
How does it stack up against closed frontier models?
It runs close to the best closed models: 65.7% on Terminal-Bench 4.0 (Claude Opus 5.5 at 66.4%, GPT-6 Astra at 58.2%) and 92.7% on BenchCAD with tools.
Start Building with Kimi K3.1 Pro
Run kimi k3.1 on Kimi.ai or through the API, switch to Highspeed when latency matters, and watch for full weights by Nov 4, 2026.