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Kimi K3

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Moonshot AI's flagship open-weight model, with a 1M-token context and its own licence

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About Kimi K3

Moonshot AI's flagship, Kimi K3, arrived on 16 July 2026 on a mixture-of-experts architecture totaling 2.8 trillion parameters; 104 billion of them are active at any one time. The model supports a context window of 1,048,576 tokens, which is roughly one million tokens of input and output combined in a single session.

Open weights for download

Moonshot AI published the full model weights on 27 July 2026, which lets anyone download the model for their own use. Moonshot's own framing places it at the top of openly downloadable models.

Terms of the Kimi K3 License

The model ships under the Kimi K3 License, a bespoke agreement. It is open weight but not open source under the Open Source Initiative definition, so a team that plans to redistribute the model or build a commercial product on top of it needs to read that license closely before committing.

TrustList summary

Kimi K3 is the flagship of Moonshot AI, launched on 16 July 2026. It is a mixture-of-experts model with 2.8 trillion parameters, of which 104 billion are active, and its full weights were published on 27 July 2026. The source describes it as the largest open-weight model available for public download.

What Kimi K3 does

  • Mixture-of-experts design: 2.8 trillion parameters with 104 billion active.
  • Long context: a window of 1,048,576 tokens.
  • Published weights: full weights released for download on 27 July 2026.
  • Own licence: the Kimi K3 License, which makes it open-weight but not OSI open source.

Key facts

  • Launched: 16 July 2026
  • Developer: Moonshot AI
  • Licence: Kimi K3 License, not OSI open source

Summary written by TrustList from the business's own published information, Nov 2026.

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Trust Score

4/ 100
Trust Score: New

An earned signal from verification, reviews, awards, transparency and engagement - the vendor can't buy it.

Verification
0/100 · 20%
Reviews
0/100 · 30%
Awards
0/100 · 15%
Transparency
18/100 · 20%
Engagement
0/100 · 15%
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Updated 9/16/2026

What the business tells TrustList

Founded
2026 (0 years) evidence sent

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