Vista Equity backs Together AI in $800 million funding as open-source AI gains ground

Vista Equity Partners, led by Robert F. Smith, America’s third-wealthiest Black person, has joined a high-profile $800 million Series C funding round for Together AI, underscoring its growing focus on artificial intelligence infrastructure as demand surges for lower-cost alternatives to proprietary models.

The investment, which values Together AI at $8.3 billion post-money, was led by Aramco Ventures, with participation from General Catalyst, Emergence Capital, NVIDIA, March Capital, Pegatron, and others. Vista Equity’s involvement highlights its strategic interest in platforms enabling scalable AI deployment amid rising enterprise adoption.

Vista’s bet on AI infrastructure
Vista Equity, known for backing enterprise software companies, is positioning itself at the center of the next wave of AI-driven transformation. Its participation reflects a broader shift among private equity and venture investors toward infrastructure providers that support large-scale AI workloads rather than just application-layer startups.

Together AI has emerged as a key player in this space, offering companies the ability to train and run open-source AI models at significantly lower costs compared to closed systems. As businesses grapple with rising expenses tied to frontier AI models, platforms like Together are gaining traction for their efficiency and scalability.

The company’s growth trajectory reinforces that momentum. Annual bookings surpassed $1.15 billion in the last quarter, while usage of open-source models across the industry has tripled over the past year. Together AI now serves thousands of paying customers, including AI-focused firms such as Cursor, Cognition, and Decagon.

Driving down AI costs at scale
Together AI’s platform enables enterprises to deploy models such as DeepSeek, Nemotron, MiniMax, and Kimi, delivering comparable or improved performance at a fraction of the cost of proprietary alternatives. Customers have reported cost reductions ranging from approximately 6x to 60x, highlighting the economic advantage of open-source AI systems.

This shift aligns with broader industry trends. According to McKinsey, nearly three-quarters of organizations expect to increase their use of open-source AI, as companies seek to maintain margins while scaling AI capabilities.

The company is also investing heavily in research and infrastructure to improve inference efficiency, positioning itself as a foundational layer in the AI ecosystem.

Scaling infrastructure for future demand
Vista Equity Partners, with over $100 billion in assets under management, has a proven track record of investing in high-growth technology companies. Under Robert F. Smith‘s leadership, the firm has generated $14.3 billion in gains since 2021 and raised $20 billion for its latest flagship fund.

Proceeds from the funding round will be used to expand Together AI’s product offerings and significantly scale its infrastructure footprint. The company expects its capacity to grow roughly 50-fold over the next five years, reflecting the anticipated surge in demand for AI compute.

For Vista Equity, the investment signals confidence in the long-term role of infrastructure providers in shaping the AI economy. As enterprises shift toward open ecosystems, the ability to deliver scalable, cost-efficient AI solutions is becoming a critical differentiator. Together AI, founded in 2022, is positioning itself as a core platform for that transition, combining open-source models, high-performance computing, and research in AI efficiency.