Elon Musk appeared in a California courtroom on Tuesday, sounding an alarm about artificial intelligence, which he himself had helped develop, as something capable of destroying humanity’s civilisation. His target: OpenAI, the firm he co-founded a decade back and now wishes to dismantle in its present avatar.

Musk has sued OpenAI, along with CEO Sam Altman and president Greg Brockman, in the United States District Court for the Northern District of........

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