Scale AI is an American artificial intelligence infrastructure and software company that accelerates the development of AI applications by providing high-quality training data and full-stack technologies. It specializes in data annotation, model evaluation, and reinforcement learning from human feedback (RLHF) for various data types including images, video, text, audio, and 3D sensor data. The company serves enterprises, governments, and AI labs, helping them build, deploy, and oversee AI applications.