Kimi K2 at a glance
Kimi K2 is a mixture-of-experts model with 1T total and 32B active parameters, trained with the MuonClip optimizer and tuned for tool use, released as Base and Instruct weights.
What changed with Kimi K2
Moonshot AI's platform changelog records the official release of Kimi K2 on July 11, 2025, under the API model name kimi-k2-0711-preview, and the weights went up on Hugging Face the same day. K2 is a mixture-of-experts model with 1 trillion total parameters and 32 billion activated per token, with a 128K context window.
Moonshot trained K2 with its MuonClip variant of the Muon optimizer to keep large-scale training stable, and designed it specifically for tool use, reasoning and autonomous problem solving. It shipped as Kimi-K2-Base for researchers who want to fine-tune and Kimi-K2-Instruct for chat and agent use; the Instruct model is a fast, non-thinking model. Code and weights use a modified MIT license.
Kimi K2 in numbers
Values are copied from the linked source on the date shown. They are not IA Compa measurements.
- Context windowas of · Source for Context window: github.com (opens in a new tab)
- 128K tokens
How it compares
Other models in the same category that we have covered, using each model's latest recorded value. (Models)
Where to compare Kimi K2
Independent leaderboards and official resources for comparing this model yourself. Rankings change often; each site shows its own current data.
General leaderboards
Why Kimi K2 matters for businesses
For businesses, K2 was one of the strongest open-weight models for agentic coding and tool calling at release, giving teams a self-hostable or low-cost hosted option for automation agents, provided they review the license terms and where their data is processed.
Sources for this story
- Kimi Open Platform: New Feature Release Log (opens in a new tab)Official
Moonshot AI · platform.kimi.ai
- Kimi K2 repository (opens in a new tab)Official
GitHub · github.com
- moonshotai/Kimi-K2-Instruct (opens in a new tab)Official
Hugging Face · huggingface.co
- Kimi K2 model page (opens in a new tab)Benchmark
Artificial Analysis · artificialanalysis.ai
Last verified: . IA Compa summarizes public announcements for business readers. We are not affiliated with the companies mentioned. Always confirm details, pricing, and availability with the official source.
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