Kimi K3.1 Pro

Updated Nov 11, 2026. Checked daily. Last checked Nov 13, 2026.

Moonshot AI

Download the Kimi K3.1 Pro weights from Hugging Face, or open Kimi.ai.

Free (limited)

Released: Oct 23, 2026
Cost: Weights are free to download. API is $2 per million input tokens and $10 per million output.
Free tier: The weights are free to download and run locally, and Kimi.ai offers limited free chat.
Privacy default: Yes. The Kimi consumer policy says prompts and files can be used to improve models. Ask Kimi support to stop training use if the app has no toggle. Source

Apps that offer this model

Hugging Face: Free, Free, free tier yes, Technical. Source

Where it ranks

🧮 Reasoning, Math & Science: Open weights

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Leader history

No leader change mentions this model yet.

Questions

Is Kimi K3.1 Pro good for reasoning, math & science?

Kimi K3.1 Pro is the open weights pick for reasoning, math & science. Leads open-weight reasoning benchmarks while rivaling top proprietary models.

How much does Kimi K3.1 Pro cost?

Weights are free to download. API is $2 per million input tokens and $10 per million output.

Does Kimi K3.1 Pro train on my chats?

Yes. The Kimi consumer policy says prompts and files can be used to improve models. Ask Kimi support to stop training use if the app has no toggle.