On Friday, at the World Artificial Intelligence Conference in Shanghai, Chinese AI start-up Moonshot unveiled Kimi K3—a massive new model boasting 2.8 trillion parameters that the company claims can rival top American firms like OpenAI and Anthropic.
The model, which Moonshot described as its “most capable flagship model to date”, is set to be released as an open-source system on 27 July. That will make it the world’s first openly available model in the three-trillion-parameter class, freely downloadable and customisable by outside developers.
“Moonshot AI unveils Kimi K3 with 2.8 trillion parameters, set for open-source release on 27 July.”
The announcement arrives at a sensitive moment for the global tech sector. Just weeks earlier, the US government abruptly forced Anthropic to temporarily withdraw its flagship Fable and Mythos models due to severe cybersecurity concerns. While Washington has since lifted those restrictions, the move underscored how the US now views frontier AI as critical national infrastructure subject to strict export controls.
Yet Kimi K3’s rapid emergence suggests Chinese firms are successfully bypassing those barriers and advancing independently despite US restrictions on hardware sales. Heavily backed by domestic tech giants Alibaba and Tencent, Moonshot has quickly risen to the forefront of China’s generative AI ecosystem.
Unlike the closed, proprietary systems from OpenAI or Anthropic, Kimi K3’s open nature allows global users to modify it for advanced reasoning and complex software development. Moonshot noted the system is uniquely built to operate with “minimal human supervision” for sustained tasks such as engineering and coding.
Third-party evaluations from Artificial Analysis and Arena.ai already show the model performing on par with leading US systems like OpenAI’s GPT and Anthropic’s Claude. In blind human-preference tests, Kimi K3 ranked first in web interface engineering, outperforming Anthropic’s Fable.
The system’s massive size means running it locally requires significant computing equipment, but making it open-source could heavily disrupt Silicon Valley’s commercial models. The announcement had an immediate impact: shares of Moonshot’s domestic competitors Zhipu and MiniMax tumbled sharply in Hong Kong by about 27% and 16% respectively.