Kimi K3.1 Pro weights are public on Hugging Face

Hugging Face lists a public repository, moonshotai/Kimi-K3.1-Pro. Its model API, https://huggingface.co/api/models/moonshotai/Kimi-K3.1-Pro, records createdAt and lastModified of 2026-11-02T04:13:51.000Z. The record says the repository is not private and not gated. The model card does not print a separate release date. Kimi's 23 October post, whose page data still records a modified date of 24 October 2026, still says the full model weights will be released by 4 November. That blog was not updated to say they are out.

The card calls Kimi K3.1 Pro an open-weight, natively multimodal model, the first in the K3.1 series. Its summary table lists 2.8T total parameters, 104B activated parameters, a context length of 1048576, text and image input, and MXFP4 weights with MXFP8 activations under quantization-aware training. It says the API name on platform.kimi.ai is kimi-k3.1-pro.

The licence file in that repository grants use of the weights, including commercial dealing, with extra conditions. It says a licensee that operates a "Model as a Service" business, and whose aggregate revenue with its affiliates exceeds 20 million US dollars, or the equivalent in other currencies, over any consecutive 12 months, must enter a separate agreement with Moonshot AI before using the software or derivative works for any commercial purpose. It defines that service as giving a third party access to inference or fine-tuning in a way that allows meaningful control over inputs, parameters or training data. It says the definition does not include end-user products where the model is only embedded in specific features or harnesses, or mere relaying of requests to models hosted by others. It says that if the software is used for a commercial product or service with more than 100 million monthly active users, or more than 20 million US dollars in monthly revenue, the name "Kimi K3.1-Pro" must be displayed on the user interface. It says those two conditions do not apply to internal use, or to use through Moonshot AI's official products or certified inference partners.

What it means for business: the weights can be downloaded. A firm that offers third parties control of inference or fine-tuning, and that crosses the licence's 20 million US dollar revenue line, needs a separate Moonshot agreement before commercial use. Internal use is outside that clause. Kimi's own blog had not been changed to mark the weights as released when this page was checked. This describes the card and the licence. It is not advice on a contract.