Kai Chen, a Canadian AI researcher at OpenAI and a pivotal figure in the development of GPT-4.5, has been denied a U.S. green card after 12 years of living and contributing to the American tech sector ...

Kai Chen, a Canadian AI researcher working at OpenAI who's lived in the U.S. for 12 years, was denied a green card, according to Noam Brown, a leading research scientist at the company.