Why open-weight AI is the new frontier in the US-China tech race

PALO ALTO, California/HONG KONG -- China's DeepSeek is once again causing a stir in American tech and policy circles, this time with the release last week of V4 Pro, a so-called open weight AI model that is free for anyone to download. The move has Washington and Silicon Valley debating more intensely than ever whether -- and how -- the U.S. should respond to the rise of such Chinese AI technology.