Together AI secures 800 million dollars in a Series C funding round spearheaded by Aramco Ventures.

      TL;DR Together AI has secured 800 million dollars in a Series C funding round led by Aramco Ventures, reaching a valuation of over eight billion dollars to enhance its open-source AI cloud platform. The funding round included participation from Vista Equity Partners, General Catalyst, Emergence Capital, Nvidia, March Capital, Pegatron, and SentinelOne’s S Ventures. Together AI reports an annual revenue exceeding one billion dollars and a tripling in the usage of open-source models on its platform over the past year, based on data from OpenRouter.

      This new valuation marks a significant increase, as the company raised 305 million dollars in a Series B round in February 2025, valuing it at approximately three billion dollars, with General Catalyst and Prosperity7 leading that round. Prior to that, Together AI raised 102 million dollars in a Series A round in November 2023, backed by Kleiner Perkins; in March, reports indicated the company was in discussions to raise one billion dollars at a valuation close to seven and a half billion dollars.

      Together AI functions as a cloud platform for running open-source AI models, serving as a link between large-scale cloud providers and developers seeking alternatives to the proprietary systems offered by OpenAI or Anthropic. Its clientele features Cursor, the AI coding assistant, Cognition, which develops the Devin AI software engineer, and Decagon, an AI customer service startup. The company plans to utilize the newly acquired funds to enhance its computing infrastructure and expedite the development of its inference engine.

      The founding team brings substantial academic authority, with CEO and co-founder Vipul Ved Prakash having previously created Topsy, the social analytics firm acquired by Apple in 2013 for over 200 million dollars. Co-founders Percy Liang, a professor of computer science at Stanford, and Ce Zhang, who has worked at ETH Zurich and the University of Chicago, provide significant research expertise to the company, which was established in 2022.

      This funding comes at a time when investment in AI infrastructure is accelerating rapidly, with valuations in the cloud sector rising significantly as the demand for GPU computing continues to exceed supply. Upscale AI secured a 190 million dollar extension in June, totalizing its funding at 500 million dollars with a valuation of two billion dollars. TensorWave, utilizing AMD chips for its cloud services, raised 350 million dollars in a Series B round, achieving a valuation near one and a half billion dollars.

      Together AI’s commitment to open-source distinguishes it from its competitors in the cloud space. While rivals like Groq and RunPod primarily focus on renting out raw GPU resources, Together AI combines its compute offerings with proprietary inference optimization software, claiming to reduce the cost of running popular models by as much as 80 percent. This software component acts as a protective barrier against what could otherwise become a standard hardware market.

      The involvement of Aramco Ventures in this funding round indicates increasing interest from the Middle East in the foundational infrastructure of artificial intelligence, beyond just the AI models. The critical question for Together AI is whether its open-source strategy and software advantages can sustain themselves as large cloud providers, backed by substantial capital, develop their own inference solutions at an unmatched scale.