Every day seems to bring fresh bets on artificial intelligence (AI). In the past few weeks CoreWeave, an AI cloud-computing company, and H, a French AI startup, have raised hefty sums of money. On May 26th it was Elon Musk’s turn. The tech billionaire’s startup, christened xAI, said it had raised $6bn at a valuation of $24bn. Investors include Silicon Valley stalwarts such as Sequoia Capital and Andreessen Horowitz, two venture-capital (VC) giants, and an investment fund with ties to the Saudi royal family. Their backing puts xAI’s firepower in the big leagues, alongside model-builders such as OpenAI, the creator of ChatGPT, and Anthropic (see
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