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As projects like Pacing the Frontier look to major labs as a way to keep AI research safe, open-source models have become a sore spot for the industry. With free distribution and little control over how they’re used, open-weight models aren’t easily controlled, leading some labs to treat them as downright scary. But at the Ai4 conference in Las Vegas last week, three of the world’s most respected AI researchers — Nobel Prize winner Geoffrey Hinton, World Labs CEO and co-founder Fei-Fei Li, and Coursera co-founder Andrew Ng — spoke out on the issue. And while they disagreed on particular tactics, all three made a powerful case for keeping AI open.