Together AI raises $800M at $8.3B valuation, more than doubling its worth in 18 months
Tags AI · Infrastructure · Enterprise · VC
AI neocloud provider Together AI closed an $800 million Series B led by Alkeon Capital and Coatue, with participation from Nvidia and Aramco Ventures, valuing the company at $8.3 billion — up from $3.3 billion in early 2025. The funding will expand Together's GPU cluster capacity for hosting open-source models like Llama and its custom inference stack. The round reflects continued investor appetite for AI infrastructure plays that serve open-weight model deployments rather than proprietary frontier labs.
Technical significance
Together AI's valuation jump from $3.3B to $8.3B in 18 months signals that the market values open-model inference infrastructure as a distinct, defensible category separate from frontier model training. The participation of Nvidia and Aramco Ventures suggests strategic alignment with both compute supply and sovereign AI ambitions. This capital will likely accelerate the commoditization of open-weight model serving, pressuring closed-model API margins.