Nathan Chen, the 17-year-old researcher who helped develop Kimi K3, leaves Moonshot AI
Chen Guangyu, known as Nathan Chen, announced on October 15 on X his departure from Moonshot AI, the Beijing-based company behind Kimi, after less than a year. The researcher, born in China in 2009, joined in November 2025 at age 16 and was one of the first signatories of the Attention Residuals study, whose mechanisms were incorporated into Kimi K3, a model with 2.8 trillion parameters. His departure has drawn interest in Silicon Valley; he confirmed he is going to the San Francisco Bay Area and denied he will work at Anthropic.


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