An open letter with signatories including hundreds of the biggest names in tech, including Elon Musk, has urged the world’s leading artificial intelligence labs to pause the training of new super-powerful systems for six months, saying that recent advances in AI present “profound risks to society and humanity.” The letter comes just two weeks after the public release of OpenAI’s GPT-4, the most powerful AI system ever released, which has led researchers to slash their expectations for when AGI—or artificial general intelligence that surpasses human cognitive ability—will arrive.