Together AI Raises $800M to Scale Open-Source Inference

1Key Takeaways

• Originally published on AI Tech Connect .
• What you need to know The round — $800M Series C, closed 1 July 2026, at an $8.3B post-money valuation.
• That is a 2.5x jump from the $3.3B valuation Together AI carried after its $305M Series B in February 2025.
• Who wrote the cheque — led by Aramco Ventures (via its US venture arm, Prosperity7 Ventures), with Vista Equity Partners, General Catalyst, Emergence Capital, Nvidia, March Capital, Pegatron and S Ventures also participating.