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Long Story Video Skill
Turn a brief into a 10s–10min piece — the agent drafts the script, prompts and shots in one pass.
Ads Video Skill
Build product ads end to end, with scripts, prompts and footage generated together.
3D Science Explainer Video Skill
Turn scientific concepts into 3D explainer animations
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kimi k3.1 pro
Explore Kimi K3.1 Pro — 3T-class open weights, a one-million-token window and a Highspeed option built for rapid back-and-forth. Start free.
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What Draws Builders to Kimi K3.1 Pro
The K3.1 family's debut release: 3T-class weights anyone can host, room for a million tokens, and a quicker Highspeed endpoint.
- Trillion-Parameter Open Release, 1M-Token ReachDebuting the K3.1 family, this 3T-class checkpoint is the strongest open-weight build in the line, holding a one-million-token window for code, 3D assets and financial datasets.
- Highspeed Mode, Two to Three Times QuickerThe Highspeed endpoint turns replies around two to three times quicker than the standard build, so back-and-forth iteration feels near-instant. Both versions ship today.
- Reinforcement Learning Tuned Across Hundreds of FieldsA post-trained K3 with far heavier compute behind it — reward framework, long-context serving, sandboxes and rollout scheduling tuned together for steady, predictable gains.
Ways to Start Using Kimi K3.1 Pro
Three ways in — browser and mobile apps, desktop developer tools, or the API for teams and enterprise rollouts.
Capabilities You Get with Kimi K3.1 Pro
From shipping code and long autonomous runs to parametric CAD, finance research, accuracy gains and benchmark standing.
Shipping Code and Full Game Engines
From single fixes inside existing repositories to complete project builds, it works in Unity, Unreal Engine and Godot, with noticeably better typography, animation and front-end finish.
Self-Correcting Runs Over Long Horizons
In a 167-mission, 420-review internal walking-simulator trial, the model traced faults and fixed 36 shoulder moment-arm errors before retraining its own controller.
Parametric CAD and 3D Asset Scripting
With tools enabled it lands 92.7% on BenchCAD, writing and running Blender and CAD scripts directly — no MCP layer — for parts, structures and custom furniture.
Auditable Financial Workflows
64.4 on OfficeQA Pro v2, alongside gains over K3 of 7.2 points in financial modeling, 11.6 points in research and roughly 4.2x in simulated business operation.
Fewer Hallucinations on Live Tasks
Focused tuning pulled claim-level hallucination on Kimi Hallu Bench Hard from 23.4% down to 8.3%, with answers carrying at least one factual slip at 42.4% of the former rate.
Benchmark Position and Guarded Open Weights
65.7% on Terminal-Bench 4.0, ahead of GPT-6 Astra at 58.2%, while cyber-related data removal moved xdev-bench-hard from 90.5% to 81.0%.
Kimi K3.1 Pro: Your Questions Answered
Answers on context size, availability, open weights and benchmark results for Kimi K3.1 Pro.
How much context can Kimi K3.1 Pro hold?
A one-million-token window. It opens the K3.1 series and is the strongest open-weight 3T-class model shipped so far.
How is the Highspeed version different?
It responds two to three times quicker than the standard build, which suits rapid iteration. Both are live now across Kimi.ai, Kimi Work, Kimi Code and the Kimi API.
When do the full model weights land?
Full weights are scheduled for release by Nov 4, 2026, following published principles that keep offensive cyber capability below the frontier.
How does it stack up against closed frontier models?
On coding, agentic and knowledge tests it meets or nears the best proprietary systems: 65.7% on Terminal-Bench 4.0 against 58.2% for GPT-6 Astra and 66.4% for Claude Opus 5.5, plus 92.7% on BenchCAD with tools.
Is it reliable enough for financial research?
It posts 64.4 on OfficeQA Pro v2 and beats K3 in modeling and research, with claim-level hallucination reduced from 23.4% to 8.3% on Kimi Hallu Bench Hard — a deliberate stress test rather than an everyday error rate.
How do enterprise teams get access?
Kimi Enterprise admins can switch K3.1 Pro on for the whole organization; it is off by default at launch. Kimi Business adds enterprise data privacy, member management and split personal and org accounts.
Start Building with Kimi K3.1 Pro
Kimi K3.1 Pro is available now on Kimi.ai, the mobile apps, Kimi Work, Kimi Code and the Kimi API. Turn it on in Kimi Enterprise or pick Kimi Business for your team.