Together AI, founded in 2022 by Vipul Ved Prakash alongside Stanford professor Percy Liang and Ce Zhang, gives developers a platform to train, fine-tune, and run open-source AI models at scale, positioning itself as an alternative to relying entirely on closed, proprietary model providers.
That open-model focus scaled fast: annual bookings crossed $1.15 billion, with customers including Cursor, Cognition, and Decagon, and the company raised an $800 million Series C at an $8.3 billion valuation in July 2026, led by Aramco Ventures with Nvidia, General Catalyst, and Vista Equity Partners also participating.
Pricing runs usage-based per token or per GPU-hour depending on the service, with a free tier for initial testing before scaling into production workloads. For a development team that wants to train and run open-source models at scale rather than depend entirely on closed proprietary APIs, Together AI's open-model infrastructure addresses that directly.
