Why China’s open-weight AI model Kimi K3 is sparking anxiety in Silicon Valley

Chinese start-up Moonshot AI’s Kimi K3 has narrowed the country’s Artificial Intelligence gap with the US to “a matter of weeks”, fuelling jitters in Silicon Valley over its lead in frontier AI as China doubles down on its open-source strategy.The Beijing-based unicorn released the Kimi K3, a massive 2.8 trillion-parameter large language model, late last week. According to the company, the model featured native vision capabilities and was built for long-horizon coding, knowledge work and complex reasoning tasks.Larger than any recent flagship model launched by domestic rivals like Zhipu AI and DeepSeek, Kimi K3 outperformed premier closed-source US models – including Anthropic’s Claude Opus 4.8 and OpenAI’s GPT-5.5 – trailing only the most recently released Claude Fable 5 and GPT-5.6 Sol, according to Artificial Analysis.