The U.S. tech giant’s powerful H200 chip seemed poised to boost Beijing’s A.I. ambitions, but not a single one has been purchased in China.

Mr. Musk is part of a delegation of business leaders to China, where his interests include Tesla’s electric vehicle factory and solar panels.

Before this week’s U.S.-Chinese summit, Beijing reached a milestone in its quest for technological self-sufficiency.

Beijing’s insistence that Meta unwind its deal with a Chinese A.I. start-up escalates the geopolitical fight over advanced tech.

The impact of the ruling was not immediately clear, but it could send a chilling signal to Chinese tech founders seeking to team up with foreign companies.

Chinese companies have embraced making their most advanced artificial intelligence models available to all.