Together AI Raises $800M, Doubles to $8.3B Valuation

Together AI just doubled its valuation in a single round. On July 1, the AI infrastructure startup announced an $800 million Series C at an $8.3 billion post-money valuation, up from $3.3 billion in February 2025. The round was led by Aramco Ventures, the venture arm of Saudi Arabia’s state oil giant, a detail that says as much about the deal as the number itself.

Founded in 2022, Together AI runs a platform that lets companies train and deploy AI on open models rather than closed ones from OpenAI or Anthropic. The bet is that enterprises increasingly want to own their stack, and the money suggests investors agree.

Where the money came from

Beyond Aramco Ventures, the round drew a crowd: Vista Equity Partners, General Catalyst, Emergence Capital, NVIDIA, March Capital, Pegatron, and SentinelOne’s S Ventures. That mix of a sovereign-backed lead, a chipmaker, and enterprise software investors is a snapshot of who is funding AI infrastructure right now. Aramco’s involvement in particular reflects how Gulf capital has become one of the largest forces in the sector.

The valuation jump is steep even by 2026 standards. Doubling to $8.3 billion in under 18 months puts Together AI among the more richly valued names in what has become a crowded field of AI cloud providers, sometimes called neoclouds.

The open-model wager

Together AI’s platform runs open models such as DeepSeek, MiniMax, and Kimi, letting customers train and serve them at lower cost than closed systems. The pitch is straightforward. If a company can get competitive performance from an open model it controls, why rent a black box?

The numbers behind the raise are what make the argument credible. The company said annual bookings crossed $1.15 billion last quarter, a figure that would put it well past the revenue most startups show at this valuation. That kind of traction is why the round came together at the price it did.

Compute is the real constraint

What Together AI plans to do with the money is telling. The company has secured commitments for more than 500 megawatts of compute capacity, which it says will fund roughly a 50-fold increase in capacity over five years. In AI infrastructure, growth is measured in megawatts and data-center footprints, not just headcount, and securing power has become as strategic as securing chips.

That framing matches where the broader market is heading. The biggest checks in AI are increasingly going to the companies building the plumbing, the compute, the pipelines, the reliability engineering, rather than the consumer apps that grab headlines. Together AI sits squarely in that layer.

A crowded, well-funded field

The neocloud space is not lacking for competition or capital. Together AI is racing against a set of rivals all chasing the same enterprise customers who want alternatives to the largest cloud providers. The question is whether open models can hold their performance edge as closed labs keep shipping, and whether demand for owned infrastructure grows fast enough to justify valuations climbing this quickly.

For now, the market’s answer is more money. An $800 million round at a doubled valuation is a strong vote that enterprises will keep moving toward open models and the infrastructure to run them. Whether that conviction holds through the next funding cycle is the thing to watch. For more coverage of AI startups and funding, visit Mylistingo.