Moonshot AI develops the Kimi K2 large language model series and publishes its source repository.

github.com/moonshotai/Kimi-K2
Kimi K2 homepage screenshot

About Kimi K2

Kimi K2 is a language model series from Moonshot AI, documented in a GitHub repository. It is designed for tool use, reasoning and autonomous problem-solving. The Instruct variant is described as a reflex-grade model without long thinking.

Pricing is not clearly stated.

Key features

  • Mixture-of-experts architecture with 1T total parameters and 32B activated parameters
  • 61 layers, including 1 dense layer
  • 384 experts, with 8 selected per token and 1 shared expert
  • 128K context length and 160K vocabulary
  • MLA attention and SwiGLU activation
  • Pre-trained on 15.5T tokens with the Muon optimizer
Best for: Researchers and builders who want a foundation model for fine-tuning and custom solutions, and teams that need a post-trained model for general chat and agentic experiences.

Kimi K2 at a glance

Type
Open-source project
Pricing
Not confirmed. Check the site
Details verified
Oct 22, 2026 · Official source
Open source
Not stated
Language
English
Last checked
Oct 5, 2026 · Online when checked
Listed
Oct 5, 2026

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