Together AI raises $800 million Series C at $8.3 billion valuation

The company said it would use the Series C to widen its offerings as it expands into inference, the process of running trained AI models, and to scale capacity and infrastructure. Vista Equity Partners, General Catalyst, Emergence Capital, Nvidia, Salesforce Ventures, March Capital, Pegatron and SentinelOne's S Ventures participated.

Together AI rents out Nvidia GPU clusters and other AI infrastructure. Its platform lets companies train and run workloads on open models such as DeepSeek, MiniMax and Kimi, which Together AI says cost less than closed systems.

Bookings and customers

Together AI said annual bookings were more than $1.15 billion as of its last quarter, on rising use of open source models. It says open source model usage across the industry tripled in the past year, pointing to research from AI gateway OpenRouter. Bookings and annualized revenue are different measures. In March, The Information reported, citing sources, that Together AI was seeing around $1 billion in annualized revenue, more than three times its rate in mid-2025.

The company says it has thousands of paying customers, naming Cursor, Cognition and Decagon. Together AI says customers are choosing open models to avoid paying premiums on tokens for closed frontier models.

Prior rounds and March talks

The same report said Together AI was seeking about $1 billion at a $7.5 billion valuation and that Prosperity7 Ventures, part of Aramco Ventures, was considering a significant investment. The company raised $800 million at an $8.3 billion valuation. Before this round, Together AI had raised $537 million in total.

The February 2025 Series B raised $305 million at a $3.3 billion valuation, led by General Catalyst. That valuation was more than double the $1.25 billion valuation from March 2024. Kleiner Perkins led the 2023 Series A of $102.5 million, with Nvidia and Emergence Capital participating.

Capacity plans

Together AI leases chips from other cloud providers and re-leases them to developers, and it is buying its own servers to rent from its data centers. Its documentation says those data centers are in North America. Last month it signed a multi-year cloud capacity agreement with Rumble, under which Rumble will provide Nvidia HGX B300 systems as dedicated cloud capacity. No value was given for the agreement.

In November 2024 the company partnered with Hypertec to co-build a cluster of 36,000 Nvidia GB200 NVL72 GPUs. In September 2025 it launched Together Instant Clusters, which automates GPU cluster provisioning from a single node with eight GPUs to larger systems with hundreds of GPUs. Together AI says it can scale from 16 to more than 100,000 GPUs today.

Founders and outlook

Vipul Ved Prakash, Percy Liang and Ce Zhang founded Together AI in 2022. Prakash had previously sold his social media search platform Topsy to Apple in 2013 for a reported $200+ million.

Prakash said intelligence is becoming "a foundational resource for the modern economy, every bit as essential as electricity, bandwidth or capital." He added: "Our mission is to ensure that intelligence is abundant, not expensive." Abhishek Shukla, managing director of Prosperity7 Ventures US, the Diversified Venturing Program of Aramco Ventures, said: "Building AI infrastructure over the next decade will be the biggest infrastructure project in human history."

Together AI expects its computing capacity and infrastructure to expand roughly 50-fold over the next five years.