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Kai Chen, a Canadian AI researcher at OpenAI who contributed significantly to the development of GPT-4.5, has been denied a U.S. green card despite living and working in the country for 12 years, according to OpenAI research scientist Noam Brown. The denial has sparked outrage in the tech community, with industry leaders expressing concern that such immigration hurdles could undermine America's leadership in artificial intelligence by forcing talented researchers to relocate.