Together AI raises 800 million dollars in Series C as open-source cloud demand surges

TL;DR

Together 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...

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