Before 2020, most of the AI field was open and collaborative. For me, that was the key factor that accelerated scientific progress and made the impossible possible—just look at the “T” in ChatGPT, which comes from the Transformer architecture openly shared by Google. Then came the myth that weights were too dangerous to share, and companies started optimizing for short-term revenue. That led most major AI labs, scientists and developers to stop sharing and collaborating. With @sama @OpenAI now saying they're willing to share open weights again, we have a real chance to return to a golden age of AI progress and democratization—powered by openness and collaboration, in the US and around the world. This is incredibly exciting. Let’s go, open science and open-source AI!