SAN FRANCISCO — Together AI, the AI infrastructure company that has become the go-to platform for running open-source models at scale, announced on July 1 that it raised $800 million in Series C funding, catapulting its valuation to $8.3 billion.
The Round
The financing was led by Aramco Ventures, the venture capital arm of Saudi Aramco, with participation from existing investors including Nvidia, Kleiner Perkins, and Emergent Capital. The round is one of the largest ever raised by an AI infrastructure company and reflects surging enterprise demand for alternatives to closed, proprietary AI systems.
Numbers That Speak Volumes
Together AI's growth has been explosive. The company disclosed that its annualized bookings have surpassed $1.15 billion, driven by enterprises running models such as DeepSeek, Meta's Llama, Mistral, MiniMax, and Kimi on its platform.
"The market is voting with its wallet," said Vipul Ved Prakash, co-founder and CEO of Together AI. "Enterprises want choice, portability, and competitive pricing. They don't want to be locked into a single provider's ecosystem. We're building the infrastructure layer that makes that possible."
Why Open-Source Infrastructure Matters
The raise signals a structural shift in the AI industry. While frontier model makers like OpenAI, Anthropic, and Google compete on capability, a parallel ecosystem has emerged around open-weight models that companies can run on their own terms.
Together AI sits at the center of this ecosystem, offering:
- GPU clusters optimized for training and inference of open-source models - A managed inference platform that rivals the latency and throughput of proprietary APIs - Fine-tuning services that let enterprises customize models with their own data
The Saudi Connection
The involvement of Aramco Ventures, an investor backed by the world's largest oil company, highlights a broader geopolitical dimension. Saudi Arabia is aggressively positioning itself as an AI hub, investing in compute infrastructure and data centers to diversify beyond oil.
Competitive Landscape
Together AI competes with hyperscaler cloud providers (AWS, Google Cloud, Azure) as well as other "neocloud" startups like CoreWeave, Lambda, and Voltage Park. Its focus on open-source support differentiates it from the major cloud platforms, which tend to steer customers toward their own proprietary AI services.
Nvidia's continued investment in Together AI is also strategic: as GPU supply has loosened, Nvidia benefits from having multiple channels — including third-party infrastructure providers — through which enterprises can access its chips.
What's Next
Together AI plans to use the new capital to expand its global data center footprint, add support for emerging model architectures, and build deeper integrations with enterprise workflows. The company has already announced expansions in Europe and Asia-Pacific.
The Bigger Picture
The $800 million raise is the latest and largest signal that the AI industry's center of gravity may be shifting. While proprietary models still dominate the headlines, the infrastructure to run open alternatives is attracting serious capital. If Together AI's trajectory is any guide, the next phase of the AI boom may be defined less by who builds the smartest model and more by who builds the most open, affordable, and flexible infrastructure to run it on.
