Together AI has closed an $800 million Series C funding round led by Aramco Ventures, boosting its valuation to more than $8 billion as its platform usage triples and annual bookings surpass $1 billion.
- Raised $800M in Series C, led by Aramco Ventures
- Valuation jumps from $3B to over $8B since Series B in 2025
- Tripled usage of open-source models on its platform in the past year
What happened
Together AI announced it has secured $800 million in a Series C funding round led by Aramco Ventures, drastically increasing its valuation to more than $8 billion. The round also attracted notable investors such as Vista Equity Partners, General Catalyst, Nvidia, and SentinelOne’s S Ventures. This follows a Series B round in early 2025 that raised $305 million at a $3 billion valuation.
The company highlights that its platform now has over $1 billion in annual bookings and usage of open-source AI models hosted on its infrastructure has tripled within the last year. Together AI operates a cloud service that provides optimized deployment of open-source AI models, positioning itself as an alternative to closed systems from larger AI incumbents.
Why it matters
The significant capital raise and sharp valuation increase underscore the booming market demand for specialized AI infrastructure beyond traditional hyperscalers. Together AI’s focus on open-source AI gives it differentiation in a landscape where many players merely rent raw GPU compute without added software improvements. Its inference engine software can reduce costs up to 80%, making it an appealing option for developers and enterprises aiming to control AI model deployment expenses.
Aramco Ventures’ leadership in the round signals growing strategic interest from Middle Eastern investors in foundational AI infrastructure rather than just applications or models. Together AI’s blend of compute and proprietary optimization software forms a competitive moat that could help it sustain growth and market share against much larger tech giants expanding their own AI cloud capabilities.
What to watch next
Key developments to monitor include how effectively Together AI scales its compute infrastructure and continues to advance its inference engine technology. Its ability to maintain a strong open-source community and attract AI startups as clients will also be crucial for long-term success, especially given the increasing competition from hyperscalers that have vastly deeper capital resources.
Additionally, investors and market watchers should track how Together AI leverages this new capital to expand partnerships and product offerings, as well as the strategic moves by Aramco Ventures which may signal similar future investments in AI infrastructure from the Middle East.