Kimi K3.1 Pro

Kimi K3.1 Pro is an open-weight language model from Moonshot AI, with weights released on Hugging Face on November 2, 2026.

Developer: Moonshot AI
Released: November 2, 2026
Total parameters: 2.8T
Active parameters per token: 104B
Architecture: MoE
Context window: 1M
Input: Text, image
License: Kimi K3.1 Pro License
Commercial use: Yes, with conditions
Official weights, GB: 1,561.3 GB
Hugging Face repository: huggingface.co
Checked on: November 5, 2026

Kimi K3.1 Pro is a mixture-of-experts model with 2.8T total parameters, of which 104B are active for each token. Moonshot AI lists a context window of 1,048,576 tokens. The model accepts text and image input.

The weights are released under the Kimi K3.1 Pro License. Commercial use is allowed with conditions. Model-as-a-service operators with group revenue above US$20 million over 12 months need a separate agreement with Moonshot AI. Products with more than 100 million monthly active users or more than US$20 million in monthly revenue must display “Kimi K3.1-Pro”. Internal use is exempt.

The official weights are published in MXFP4 and take about 1,561.3 GB to download. All 2.8T parameters must be loaded, so the model needs a multi-GPU server; the memory calculator shows what fits.

Total parameters, billions: 2,800B
Active parameters, billions: 104B
Context window, tokens: 1.05M
License type: Custom license
License conditions: Model-as-a-service operators with group revenue above US$20 million over 12 months need a separate agreement with Moonshot AI. Products with more than 100 million monthly active users or more than US$20 million in monthly revenue must display "Kimi K3.1-Pro". Internal use is exempt.
Weights precision: MXFP4
License text: huggingface.co
Sources: Page URL
Hugging Face model card https://huggingface.co/moonshotai/Kimi-K3.1-Pro/raw/main/README.md
License text on Hugging Face https://huggingface.co/moonshotai/Kimi-K3.1-Pro/raw/main/LICENSE
Hugging Face repository metadata https://huggingface.co/api/models/moonshotai/Kimi-K3.1-Pro
kimi.ai announcement https://www.kimi.ai/blog/kimi-k3-1-pro

Page	URL
Hugging Face model card	https://huggingface.co/moonshotai/Kimi-K3.1-Pro/raw/main/README.md
License text on Hugging Face	https://huggingface.co/moonshotai/Kimi-K3.1-Pro/raw/main/LICENSE
Hugging Face repository metadata	https://huggingface.co/api/models/moonshotai/Kimi-K3.1-Pro
kimi.ai announcement	https://www.kimi.ai/blog/kimi-k3-1-pro

Questions

What license does Kimi K3.1 Pro use?

The weights are released under the Kimi K3.1 Pro License, a custom license that allows commercial use with conditions.

Can I use Kimi K3.1 Pro commercially?

Yes, with conditions. Model-as-a-service operators with group revenue above US$20 million over 12 months need a separate agreement with Moonshot AI, and products with more than 100 million monthly active users or more than US$20 million in monthly revenue must display “Kimi K3.1-Pro”. Internal use is exempt.

How much memory does Kimi K3.1 Pro need?

Kimi K3.1 Pro has 2.8T total parameters, published in MXFP4, and all of them must be loaded. The official download is about 1,561.3 GB. As a rough guide, a model takes a little over 0.5 GB per billion parameters in 4-bit, before the context cache; the memory calculator checks which setups fit.

How many parameters does Kimi K3.1 Pro have?

2.8T in total, of which 104B are active for each token, with a context window of 1,048,576 tokens.

Sources

Every figure comes from the developer’s model card, license text and official announcements, and from the model’s Hugging Face repository metadata. Each model page lists its sources and the date they were checked; the register is rechecked every week.