Nebius, an Amsterdam AI cloud company founded by Arkady Volozh in 2024, has agreed to buy Eigen AI, a startup focused on inference and model optimisation, for $643 million in cash and Nebius Class A shares. It is expected to close in the next few weeks, pending antitrust approval.
In the past year, the unicorn signed a $17.4 billion GPU infrastructure deal with Microsoft and a $27 billion agreement with Meta. The company also secured a $2 billion investment from Nvidia and raised $4.3 billion in convertible notes to expand its data centres.
Eigen AI focuses on a different challenge: making sure that power is used as efficiently as possible. The company was founded in 2025 by Ryan Hanrui Wang and Wei-Chen Wang, both from MIT’s HAN Lab, and Di Jin, who worked on Meta’s Llama 3 and Llama 4 after training.
The integration will centre on Nebius Token Factory, which is the company’s managed inference platform. It offers enterprise-level autoscaling endpoints and fine-tuning pipelines for major open-source models.
Nebius and Eigen AI have already worked together to deliver optimised implementations that rank among the fastest on Artificial Analysis across several models, giving a preview of what the combined system can do at scale.
“We are operating in a capacity-scarcity world where AI builders need optimised inference and infrastructure scale. The integration of Eigen AI’s optimisation capabilities and founding team will establish Nebius Token Factory at the frontier of inference, offering customers market-leading model performance and unit economics with massive compute capacity to back it at scale,” says Roman Chernin, co-founder and chief business officer of Nebius.
This is the second company Nebius has bought in recent months. In February, Nebius acquired Tavily for $275 million, which added agentic search features to its platform. While CoreWeave, its main competitor, has focused on growing bigger, Nebius is betting that enterprise customers want both scale and advanced software.
