Financial markets went into a panic last week over an obscure Chinese tech start-up called DeepSeek. The company now threatens to upend the world of artificial intelligence and the race for who will dominate it.Kevin Roose, a tech columnist at The Times, discusses how DeepSeek caught us all off guard.Guests: Kevin Roose, a technology columnist for The New York Times and co-host of the Times tech podcast, “Hard Fork.”Background reading: