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kimi k3.1
Build with Kimi K3.1: open trillion-scale weights, room for a million tokens of context, and a Highspeed tier for faster turnarounds.
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Inside Kimi K3.1 Pro: Scale, Speed and Context
The K3.1 line starts here: Kimi K3.1 Pro carries a million-token window, open trillion-scale weights, and stronger coding, 3D and finance results.
- Trillion-Scale Open Weights, Million-Token RoomAs the flagship of the K3.1 family, Kimi K3.1 Pro is Kimi's most capable open-weight model yet — built at trillion scale and able to hold a million tokens of context.
- A Highspeed Variant for Quicker TurnsKimi K3.1 Pro Highspeed runs alongside the standard build and returns replies two to three times sooner, which keeps long back-and-forth sessions moving.
- Joint RL Across Hundreds of FieldsStarting from K3, Kimi K3.1 Pro went through much deeper post-training, applying large-scale joint reinforcement learning across hundreds of downstream domains so every one of them improves.
Running Kimi K3.1 Pro in Three Steps
From your first prompt to a shipped build, Kimi K3.1 Pro takes just three moves.
Where Kimi K3.1 Pro Performs Best
Coding agents, 3D and CAD work, finance pipelines and carefully bounded cyber skills — the areas where Kimi K3.1 Pro pulls ahead.
Coding Agents That Hold Long Tasks
On Terminal-Bench 4.0 it scores 65.7%, ahead of GPT-6 Astra (58.2%) and a hair 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, backed by web search and 3D generation, and the front-end pages it produces show crisper composition, typography and motion.
Parametric 3D and CAD Scripting
It reaches 92.7% on BenchCAD with tools and writes Blender or CAD scripts that shape assets, swap components and tune geometry, materials and layout — without any MCP connectors.
Finance Workflows, Start to Finish
OfficeQA Pro v2 comes in 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 Up Under Stress
Claim-level hallucination on the internal Kimi Hallu Bench Hard falls from 23.4% on K3 to 8.3%, and replies containing at least one factual slip now appear at 42.4% of K3's rate.
Cyber Skills Kept in Check
Cyber material was removed from mid-training and RL, so the released model passes 81.0% of xdev-bench-hard at pass@3, against 90.5% for the checkpoint trained without those filters.
Kimi K3.1 Pro: Your Questions Answered
Straight answers on Kimi K3.1 Pro, the Highspeed build, when open weights land and where you can run it today.
So what is Kimi K3.1 Pro, exactly?
It's the first model in Kimi's K3.1 series: K3 taken through far heavier post-training and released as open trillion-scale weights with room for a million tokens.
How far ahead of Kimi K3 is it?
The jump shows up across coding, agent and knowledge tests — 61.2% versus 55.95% on Kimi Code Bench 3.0 Long-horizon, with hallucination cut from 23.4% to 8.3%.
When will the open weights be released?
Full weights are expected by Nov 4, 2026; hosted access through Kimi's own products is already available.
Where can I try it right now?
Head to kimi.ai or the mobile apps, use Kimi Work 3.1.0 or newer, open Kimi Code, or go through the Kimi API, which offers Zero Data Retention.
Is there a faster, lower-latency option?
There is — Highspeed returns answers two to three times sooner 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 tracks close to the top closed systems: 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.
Put Kimi K3.1 Pro to Work Now
Take kimi k3.1 for a spin on Kimi.ai or via the API, flip to Highspeed whenever latency matters, and keep an eye out for full weights by Nov 4, 2026.