Together AI raises $800 million, valuation jumps to $8.3 billion

Together AI raised $800 million in a Series C led by Aramco Ventures, lifting its post-money valuation to $8.3 billion. The company, founded in 2022, builds a platform that lets businesses train and run AI workloads on open models rather than relying only on closed systems.

Together AI last raised $305 million in February 2025 at a $3.3 billion valuation, in a round led by General Catalyst and co-led by Prosperity7. That deal also drew Salesforce Ventures, Nvidia and Coatue. Before that, the company had raised $106 million in March 2024 at a $1.25 billion valuation.

Together AI provides the computing backbone for developers building on open models. Its platform supports more than 200 open-source models, including Meta’s Llama and DeepSeek, and it counted more than 450,000 AI developers last year. Annual bookings crossed $1.15 billion last quarter, with customers including Cursor, Cognition and Decagon.

The Series C will help it widen its offerings as it expands further into inference, the process of running trained AI models. It expects its computing capacity and infrastructure to grow roughly 50-fold over the next five years. Customers have reported 6x to 60x lower inference costs than closed-model pricing, and Decagon cut its inference costs sixfold after moving workloads to Together AI.

Chief executive Vipul Ved Prakash said, “The future of AI won’t be owned by a few companies. It will be built by millions of developers and businesses, and open-source models are making that possible.” The round also included Vista Equity Partners, Emergence Capital, Nvidia, March Capital, Pegatron and SentinelOne’s S Ventures.