Kimi K3.1 Pro is an open AI model, so anyone can download it for free, but the download is 1.56 terabytes and it needs data center machines to run. For a virtual assistant, that means "open" won't put it on your laptop, and it won't protect your client's files.
Kimi is the chatbot from Moonshot AI, a Chinese AI company. You'll see "open" used as if it means free, private and safe all at once. It means something much narrower.
What Open Means for Kimi K3.1 Pro
Every AI model is built on weights. These are the billions of numbers a model learns during training, and they're basically its trained brain. ChatGPT's stay on OpenAI's servers. Open weights means the company lets you download them.
Moonshot posted these on Hugging Face, a site where AI companies share models. The first upload there is dated November 2, and Moonshot had promised the weights by November 4.
Moonshot calls this an open-weight model. That's different from fully open source, where you'd expect to see everything behind the project. The page lists model files and the code to run them, with no training data.
It also has its own license, the rulebook for using it. You can use, change and even sell it for free if you keep the license notice, and two more conditions are aimed at giants.
AI hosting companies making over $20 million in 12 months need a separate deal. Products with over 100 million monthly users or $20 million in monthly revenue must display the model's name. That's not you or me.
Why You Can't Run It at Home
Look at the size on that page: 1.56 TB. Moonshot lists 2.8 trillion parameters, which is just the count of those learned numbers.
[INSERT IMAGE: hf-kimi-k3-1-pro-files.jpg] The Kimi K3.1 Pro files on Hugging Face, showing the 1.56 TB size and the license file
Storage is the easy part. The setup guide from vLLM, one of the tools Moonshot recommends for running it, describes its simplest working setup on NVIDIA hardware as eight GPUs, the powerful chips AI runs on. And these are data center chips, not the kind in a gaming PC.
So when people talk about running it yourself, they mean a company with serious hardware. That's still useful, because other businesses can host the model too. Hugging Face lists Together AI as one. But that's a developer service, not something you'd open to draft a client email.
How to Try Kimi K3.1 Pro
The realistic way is Moonshot's own Kimi, on the website or the iOS and Android apps.
Is it free? It looks that way, but Moonshot doesn't say so outright. The pricing page lists a Free plan at $0, without naming K3.1 Pro in it.
On November 7, K3.1 Pro was in the model menu on kimi.ai even before logging in, though K3 was selected by default.
Moonshot doesn't state how many K3.1 Pro messages a free plan gets, and the pricing page warns that K3.1 Pro requests may queue or fail at launch.
The model menu on kimi.ai, with K3.1 Pro at the top
Paid plans start with Plus at $19 a month, or $180 billed yearly. The full 1-million-token context window, meaning how much text it can hold in one chat, is listed only for Max and Ultra.
The Client Data Question
Here's where "open" trips people up. Open weights only keep data in-house if you run the model on your own machines. If you use Kimi's app, your prompts and files go to Moonshot, like any other chatbot.
For users outside mainland China, Kimi's terms come from NOVASCENT PRIVATE LIMITED, a Singapore company using the Moonshot AI name, and they were updated November 5.
The privacy policy says it can use your prompts and files to improve its services, including training its AI models. The terms let you opt out by emailing membership@moonshot.ai, but with a catch: "Opt-out applies prospectively only." Moonshot doesn't have to remove anything already used in training.
The policy says your information may be stored outside your country, without naming where. A help page on kimi.com says mainland China, but that site's policy is written for mainland users, so I wouldn't assume either way.
The terms also say not to submit personal data or confidential third-party information you don't have the right to use. Client inboxes are full of exactly that, so you'd need real permission first.
Kimi Business is different. Its supplement says customer content isn't used for training by default, unless the customer authorizes it or the law requires it. That's a business contract, not the free app.
What This Means for VAs
I'm not singling out Kimi. These are the questions I'd ask about any AI tool before client work goes near it. Who holds what I type? Is it used for training, and can I turn that off? Does my client know I'm using it?
If you're curious about K3.1 Pro, try it with made-up details or your own non-client tasks. My 30 free VA prompts are a good place to start.
Then put the client side in writing. If a client asks why you can't just use the newest free model, my post on setting AI expectations with clients will help with that talk.
And the next time someone says a tool is "open," you'll know what to ask: open how, and where does my client's data go?
Do your clients have a rule about which AI tools you can use?
















