China's Moonshot AI claims Kimi K3 can rival OpenAI and Anthropic

A Chinese AI start-up has unveiled a massive new model that it says can go head-to-head with the top American firms – just weeks after Washington forced the temporary withdrawal of a flagship US system over cybersecurity fears. Moonshot AI launched Kimi K3, containing 2.8 trillion parameters, at the World Artificial Intelligence Conference in Shanghai on Friday. The figure, a measure of scale and processing power, places it in the same league as OpenAI's GPT and Anthropic's Claude. Heavily backed by domestic giants Alibaba and Tencent, Moonshot has quickly risen to the forefront of China's generative AI ecosystem. In a statement the company described K3 as its "most capable flagship model to date". Its full capabilities – coding, knowledge work and reasoning – will be known when it is released as an open-source model on 27 July. That will make it the world's first open-source model in the three-trillion-parameter class that can be freely downloaded, run and customised by outside developers. Unlike the closed, proprietary American systems from OpenAI or Anthropic, Kimi K3's open nature allows global users to modify the system for advanced reasoning and complex software development. The company said the system is uniquely built to operate with "minimal human supervision" to sustain tasks such as engineering and coding. The arrival comes at a highly sensitive moment for the global tech sector, just weeks after the US government abruptly forced American developer Anthropic to temporarily withdraw its flagship Fable and Mythos models due to severe cybersecurity concerns. While Washington has since lifted those restrictions, the initial move highlights how the US government now views advanced AI software as critical national infrastructure, labelling frontier models as vital national security assets subject to strict export controls. However, the rapid arrival of Kimi K3 suggests Chinese firms are successfully bypassing these regulatory barriers and advancing independently despite US restrictions on hardware sales. Third-party evaluations from Artificial Analysis and Arena.ai show the model performing on a par with leading US models. In independent benchmarks, Kimi K3 ranked first in web interface engineering, outperforming Anthropic's Fable system in blind human-preference tests. While its massive size means running it locally requires significant computing equipment, making it open-source could heavily disrupt Silicon Valley's commercial models. The announcement had an immediate impact on shares in Moonshot's domestic competitors Zhipu and MiniMax, which tumbled sharply in Hong Kong by about 27% and 16% respectively.