Together AI announced it has raised $800 million in Series C financing at an $8.3 billion post-money valuation. Together AI is known for making it cheaper and easier for companies to run open-source AI models at scale. The round was led by Aramco Ventures, with participation from Vista Equity Partners, General Catalyst, Emergence Capital, NVIDIA, March Capital, Pegatron, S Ventures, and others.
Together AI said the funding comes as more companies building with AI face rising costs from frontier-model pricing. The company has positioned itself as an infrastructure layer for organizations that want to train and run workloads on open models at a lower cost than closed systems while maintaining comparable or better performance.
The company supports open models including DeepSeek, Nemotron, MiniMax, and Kimi. Together AI said its platform helps businesses run AI workloads at a fraction of the cost of closed systems, while its research lab continues to advance inference performance for demanding AI applications.
Together AI’s annual bookings crossed $1.15 billion last quarter. The company also said open-source model usage across the industry has tripled over the past 12 months.
Together AI now serves thousands of paying customers, including Cursor, Cognition, and Decagon. Customers report cost savings of 6x to 60x compared to closed-model pricing for equal or better performance. For example, Decagon reduced inference costs sixfold after moving to Together AI.
The company plans to use the new funding to expand its products and features as it becomes a leading provider of inference. Together AI will also dramatically scale its capacity and infrastructure footprint, which it expects to grow about 50-fold over the next five years.
Founded in 2022, Together AI describes itself as the AI Native Cloud, combining open-source models, high-performance infrastructure, and frontier research in AI efficiency and scalability. The company powers more than 1 million developers and supports production-scale inference, training, and reinforcement learning for AI-native companies.
KEY QUOTES:
“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.”
“History shows that the biggest technology shifts are won by open ecosystems that make innovation cheaper, faster and available to everyone. We believe AI will follow the same path.”
Vipul Ved Prakash, co-founder and CEO of Together AI
“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.”
Abhishek Shukla, Managing Director of Prosperity7 Ventures US, the Diversified Venturing Program of Aramco Ventures
“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 also demonstrates the strength of our multi-stage venturing platform supporting companies from early growth to late-stage scale-up as they evolve into global leaders.”
Meshal Almashari, Executive Managing Director, Late-Stage Venturing Program, Aramco Ventures
“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. This is an excellent example of how the digital and energy transitions reinforce – and this is precisely where we are focused.”
Olivier Blum, CEO of SE Ventures
“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, and the growth speaks for itself.”
Joe Floyd, General Partner at Emergence Capital
