DeepSeek’s announcement that it has built competitive AI using many fewer resources than big US rivals stunned the markets this week. Chipmakers and power companies plunged in value, and Sam Altman, boss of OpenAI, pronounced himself ‘legit’ invigorated. Today on the show, Katie Martin and Rob Armstrong try to figure out what China’s advances mean for US markets. Also, they organize a fight between their children. 

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Read a transcript of this episode on FT.com

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