Together AI, the company making it dramatically cheaper and easier to run open source AI models at scale, today announced an $800 million Series C financing at an $8.3 billion post-money valuation. The round was led by Aramco Ventures, with participation from Vista Equity Partners, General Catalyst, Emergence Capital, NVIDIA, March Capital, Pegatron, S Ventures (SentinelOne) and others. The financing comes as companies building with AI confront an uncomfortable truth: frontier-model pricing can eat their entire margin.
Together AI raises $800M Series C at $8.3B valuation led by Aramco Ventures.
Annual bookings crossed $1.15B last quarter.
Open source model usage tripled in twelve months.
Customers report cost savings of 6x to 60x vs closed-model pricing.
Serves thousands of paying customers including Cursor, Cognition, and Decagon.
75% of organizations expect to increase open-source AI use per McKinsey.
Vipul Ved Prakash, co-founder and CEO of Together AI, stated: "Intelligence is becoming a foundational resource for the modern economy, every bit as essential as electricity, bandwidth or capital. Our mission is to ensure that intelligence is abundant, not expensive. 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."
Together AI's annual bookings crossed $1.15 billion last quarter, as open source model usage across the industry has tripled in twelve months. The company now serves thousands of paying customers, including many of the biggest names in AI like Cursor, Cognition, and Decagon. Customers report cost savings of 6x to 60x compared to closed-model pricing for equal or better performance — Decagon, for example, cut inference costs sixfold after moving to Together.
Abhishek Shukla, Managing Director of Prosperity7 Ventures US, the Diversified Venturing Program of Aramco Ventures, stated: "Building AI infrastructure over the next decade will be the biggest infrastructure project in human history. Together has built the platform that makes open source models genuinely usable at enterprise scale, and the team's ambition matches the scale of the opportunity in front of them. We're proud to partner with them, not just on this round but on scaling compute and capacity globally."
Meshal Almashari, Executive Managing Director, Late-Stage Venturing Program at Aramco Ventures, added: "Our investment in Together AI reflects our long-term conviction in artificial intelligence infrastructure and the platforms that will enable AI deployment at scale. It demonstrates the strength of our multi-stage venturing platform supporting companies from early growth to late-stage scale-up."
Olivier Blum, CEO of Schneider Electric, investing through SE Ventures, commented: "AI and energy infrastructure are converging, and efficiency is the link between them. Together AI has built a platform that makes open-source AI genuinely cost-effective at enterprise scale - and more efficient AI means less energy per workload."
Joe Floyd, General Partner at Emergence Capital, added: "The shift toward open source isn't a niche preference anymore, it's becoming the default for any company that wants to scale AI without losing its margin. Together has the team, the infrastructure, and the customer base to lead that shift."
Together AI will use the new funding to expand its products and features as it becomes a leading provider of inference, and to dramatically scale its capacity and infrastructure footprint, which the company expects to grow roughly 50-fold over the next five years.
About Together AI
Together AI is the AI Native Cloud, combining state-of-the-art open-source models, high-performance infrastructure, and frontier research in AI efficiency and scalability. Founded in 2022, Together AI powers over a million developers and some of the world's most demanding AI workloads, delivering production-scale inference, training, and reinforcement learning for the next generation of AI-native companies.
