TL;DRTogether AI raised 800 million dollars at an eight billion dollar valuation, led by Aramco Ventures, to scale its open-source AI cloud platform.
Together AI has raised 800 million dollars in a Series C round led by Aramco Ventures, valuing the company at more than eight billion dollars. The round also drew Vista Equity Partners, General Catalyst, Emergence Capital, Nvidia, March Capital, Pegatron, and SentinelOne’s S Ventures. Together AI says it now generates more than one billion dollars in annual bookings and that usage of open-source models on its platform has tripled over the past year, according to data it cites from OpenRouter.
The valuation represents a sharp jump. Together AI raised 305 million dollars in a Series B in February 2025 at a valuation of roughly three billion dollars, led by General Catalyst and Prosperity7, the venture arm of Aramco. Before that, it closed a 102 million dollar Series A in November 2023 from Kleiner Perkins, and The Information reported in March that the company was in talks to raise one billion dollars at a valuation near seven and a half billion dollars.
Together AI operates as a cloud platform for running open-source AI models, positioning itself between the hyperscalers and the developers who want alternatives to closed systems from OpenAI or Anthropic. Its customers include Cursor, the AI coding tool, Cognition, the maker of the Devin AI software engineer, and Decagon, an AI customer support startup. The company says it will use the new capital to expand its compute infrastructure and accelerate development of its inference engine.
