As AI becomes critical infrastructure for science, medicine, industry, and government, one question matters more than ever: who gets to understand how these systems work? At Ai2, that question is central to our work, and it’s what motivates our commitment to open science and open models. This is what open science looks like in AI: producing research that others can inspect, test, and extend. Maintaining access to open-source AI artifacts is essential to broad participation in AI research and development. In AI, open artifacts, shared infrastructure, and broad participation carry that tradition forward—expanding independent research, accelerating scientific progress, and enabling more people to understand, evaluate, and improve the systems shaping society.