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Atlas record: https://www.aitimeline.dev/en/events/evt-0357/

Availability · July 27, 2026

Kimi K3 at 2.8 trillion parameters

Moonshot AI opened the weights of Kimi K3: 2.8 trillion parameters, 104 billion active per token, a million tokens of context.

Why it matters

The largest model whose weights can be downloaded, by the company's word the first open 3T-class model, and it is not American.

Of 896 routed experts, sixteen work on each token, alongside two shared ones; the model takes images natively. It launched through the API on 16 July; the weights were promised by 27 July and went up on Hugging Face on the 27th. The licence is its own: an operator selling models as a service whose group's aggregate revenue passes 20 million dollars in 12 months must sign a separate agreement with Moonshot before commercial use. It is 1.75 times the previous largest open model, DeepSeek V4 Pro at 1.6 trillion. In 2024 Meta called Llama 3.1 at 405 billion the largest openly available model; K3 is almost seven times larger.

Event record

Event date
July 27, 2026
Timeline date
Event date
Verification
Sources gathered automatically · September 27, 2026
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ID
evt-0357

The weights went up on Hugging Face on 27 July 2026, the date they had been promised by; the model had been on the API since 16 July.

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