By Sayash Kapoor, Rishi Bommasani, Percy Liang, Arvind Narayanan Perhaps the biggest tech policy debate today is about the future of AI, especially foundation models and generative AI. Will AI be open or closed? Will we be able to download and modify these models, or will a few companies control them? The stakes couldn’t be higher. A closed path could lead to a concentration of power never before seen in the history of capitalism, especially so if AI turns out to have a transformative effect on the economy. On the other hand, open models might be easier for bad actors to misuse.