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kimi k3.1
Put kimi k3.1 to work in one prompt box — craft code, 3D assets or full pages, and flip to Highspeed whenever you need answers sooner.
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Why kimi k3.1 Stands Out for Builders
kimi k3.1 brings a fresh generation of open-weight intelligence, pairing an enormous working memory with sharper coding, 3D modelling and financial analysis.
- Trillion-parameter foundation, open to allThe flagship of the K3.1 family arrives as an openly downloadable trillion-scale model, offering a context space large enough to hold an entire codebase or research library.
- A Highspeed twin for rapid iterationA parallel variant, Kimi K3.1 Pro Highspeed, returns answers two to three times sooner than the standard build — ideal for rapid prototyping and back-and-forth dialogue.
- Reinforcement learning tuned across domainsStarting from K3, the team applied substantially deeper post-training and broad multi-domain reinforcement learning, so performance rises across hundreds of real-world tasks at once.
Getting Started with kimi k3.1
From your opening prompt to a polished deliverable in three straightforward moves.
What kimi k3.1 Can Do
From autonomous coding to parametric CAD, financial modelling and controlled security testing — the areas where this model delivers measurable results.
Autonomous coding over long sessions
Terminal-Bench 4.0 scores it at 65.7%, ahead of GPT-6 Astra at 58.2% and narrowly behind Claude Opus 5.5 at 66.4%; on Kimi Code Bench 3.0 Long-horizon it improves to 61.2% from K3's 55.95%.
Game engine and Three.js authoring
Unity, Unreal Engine and Godot are all supported and combined with live web search and 3D generation, while front-end output shows more refined layout, typography and motion.
Scripted 3D modelling and CAD
BenchCAD with tools reaches 92.7%; the model writes Blender or CAD scripts to sculpt assets, swap parts and tune geometry, materials and arrangement — no MCP connectors required.
Complete 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 roughly 4.2x on Business Operation tasks.
Factual accuracy under pressure
On the internal Kimi Hallu Bench Hard, claim-level hallucination falls from 23.4% on K3 to 8.3%, while responses containing at least one factual error drop to 42.4% of K3's rate.
Security ability responsibly bounded
Cyber-related data was removed during mid-training and RL; the released model still passes 81.0% of xdev-bench-hard at pass@3, against 90.5% for the unfiltered checkpoint.
kimi k3.1 — Common Questions
Answers on what kimi k3.1 includes, how the Highspeed tier differs, when weights land and which platforms support it.
What is kimi k3.1, in plain terms?
It is the debut release in Kimi's K3.1 series — K3 taken through far more extensive post-training and offered as openly available trillion-scale weights with a million-token context allowance.
How much does it improve on Kimi K3?
Improvements span coding, agentic and knowledge evaluations: 61.2% versus 55.95% on Kimi Code Bench 3.0 Long-horizon, while hallucination falls from 23.4% down to 8.3%.
When will the open weights be published?
Complete weights are scheduled for release no later than November 4, 2026; hosted access through Kimi's own products is available right now.
Which platforms can I use it on today?
Through kimi.ai and the mobile apps, Kimi Work 3.1.0 or later, Kimi Code, and the Kimi API, which also offers Zero Data Retention.
Can I get faster responses?
Absolutely — the Highspeed variant replies two to three times quicker 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 competes closely with the leading proprietary systems: 65.7% on Terminal-Bench 4.0 versus Claude Opus 5.5 at 66.4% and GPT-6 Astra at 58.2%, plus 92.7% on BenchCAD with tools.
Start Building with kimi k3.1
Try kimi k3.1 on Kimi.ai or via the API, switch to Highspeed whenever latency matters, and keep an eye out for the full weight release by November 4, 2026.