Together AI raises $800M Series C as open-source cloud demand surges

Together AI has secured $800 million in Series C funding led by Aramco Ventures, pushing its valuation past $8 billion. The round attracted a wide array of investors including Vista Equity Partners, General Catalyst, Emergence Capital, Nvidia, March Capital, Pegatron, and SentinelOne’s S Ventures. The company now reports annualized revenue exceeding $1 billion, signaling strong demand for its open-source cloud infrastructure.

This massive capital injection comes as enterprises increasingly shift toward open-source AI models for flexibility, cost control, and data privacy. Together AI’s platform offers a cloud-based alternative to proprietary systems, allowing developers to train, fine-tune, and deploy large language models without vendor lock-in. The company’s rapid revenue growth underscores how quickly the market is embracing open-source solutions over closed ecosystems.

The participation of Nvidia, a dominant force in AI hardware, highlights the strategic importance of Together AI’s cloud services. By providing optimized infrastructure for open-source models, Together AI helps companies bypass the high costs and complexity of building their own AI stacks. This approach has resonated strongly with both startups and large enterprises seeking scalable, customizable AI capabilities.

With this new funding, Together AI plans to expand its engineering team, scale its data center footprint, and accelerate product development. The company is positioning itself as a key player in the open-source cloud AI market, competing directly with major cloud providers and proprietary model developers. As AI adoption continues to surge across industries, Together AI’s bet on open-source infrastructure appears increasingly well-timed.