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kimi k3.1
kimi k3.1 ships open 3T-scale weights and a one-million-token window, plus a Highspeed mode answering 2-3x quicker.
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Why Build with Kimi K3.1 Pro
K3.1 opens with Kimi K3.1 Pro — a million-token window, open 3T-scale weights, and gains in coding, 3D work and finance research.
- Open 3T weights, million-token windowKimi K3.1 Pro leads the K3.1 line: Kimi's strongest open-weight release at 3T scale, with room for a million tokens of context.
- Highspeed at 2-3xA companion build, Kimi K3.1 Pro Highspeed, answers 2-3x faster than the standard model for snappier back-and-forth.
- Joint RL across hundreds of domainsBuilt on K3 with far heavier post-training, Kimi K3.1 Pro runs large-scale joint RL over hundreds of downstream domains, lifting each one.
How to Use Kimi K3.1 Pro
Three steps from a first prompt to a finished build with Kimi K3.1 Pro.
Kimi K3.1 Pro Capabilities
Coding agents, 3D and CAD creation, finance workflows and measured cyber limits — where Kimi K3.1 Pro earns its keep.
Long-horizon coding agents
Terminal-Bench 4.0 puts Kimi K3.1 Pro at 65.7%, past GPT-6 Astra (58.2%) and just under Claude Opus 5.5 (66.4%); Kimi Code Bench 3.0 Long-horizon climbs to 61.2% from K3's 55.95%.
Game engines and Three.js scenes
Unity, Unreal Engine and Godot all work, paired with web search and 3D generation, while its front-end pages show tighter composition, typography and motion.
Parametric 3D and CAD scripting
BenchCAD with tools lands at 92.7%, and it writes Blender or CAD scripts to shape assets, swap components and adjust geometry, materials and layout — no MCP connectors needed.
Finance workflows end to end
OfficeQA Pro v2 reaches 64.4; against K3 it adds 7.2 points on Financial Modeling, 11.6 on Financial Research and roughly 4.2x on Business Operation.
Accuracy held under stress
On the internal Kimi Hallu Bench Hard, claim-level hallucination drops from 23.4% on K3 to 8.3%, and answers carrying at least one factual slip sit at 42.4% of K3's rate.
Cyber capability kept in check
Cyber data was stripped from mid-training and RL; the shipped model clears 81.0% of xdev-bench-hard at pass@3, versus 90.5% for the checkpoint without those filters.
Kimi K3.1 Pro — FAQ
Common questions about Kimi K3.1 Pro, its Highspeed build, weights timing and where to run it.
What exactly is Kimi K3.1 Pro?
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 much better is it than Kimi K3?
Gains land across coding, agent and knowledge tests — 61.2% versus 55.95% on Kimi Code Bench 3.0 Long-horizon, with hallucination trimmed from 23.4% to 8.3%.
When do the open model weights arrive?
Full weights are slated for release by Nov 4, 2026; hosted access through Kimi's products is already live today.
Where can I access it today?
On kimi.ai and the mobile apps, in Kimi Work 3.1.0 or newer, in Kimi Code, and through the Kimi API, where Zero Data Retention is offered.
Is there a lower-latency option?
Yes — Highspeed answers 2-3x faster and is callable as kimi-k3.1-pro-highspeed on the Kimi API Platform.
How does it compare with proprietary frontier models?
It sits close to the top 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.
Try Kimi K3.1 Pro Today
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.