Together.ai is an open-source AI infrastructure company founded by Vipul Ved Prakash, Percy Liang, Ce Zhang, and Chris Re. The company focuses on building scalable infrastructure for training and serving large language models and other generative AI systems. Together.ai offers a cloud platform optimized for efficient training and inference of open foundation models, combining high-performance compute with transparency and flexibility. By enabling access to open models and weights, the company supports a more collaborative and customizable AI ecosystem.