New York, July 17 -- Chinese startup Moonshot AI launched its most capable frontier model, Kimi K3, which it claims can rival most of the advanced models by Anthropic and OpenAI.

The company said that the model is a 2.8 trillion-parameter model with a 1-million-token context window.

"It is the world's first open 3T-class model, designed for frontier intelligence across long-horizon coding, knowledge work, and reasoning," the company said in its blog.

The startup claimed that it demonstrated frontier-level performance across its evaluation suite but still trails Claude Fable 5 and GPT 5.6 SoI.

"Kimi K3 is available today on Kimi.com, Kimi Work, Kimi Code, and the Kimi API. At launch, Kimi K3 will use max thinking effort by default, wit...