Nebius is acquiring Eigen AI, an infrastructure company focused on optimizing open-source AI models, in a deal valued at approximately $643M in cash and Class A shares.

Eigen AI improves performance across modern architectures such as MoE, long-context, reasoning, and sparse attention models, helping teams optimize inference, fine-tuning, and post-training without building custom infrastructure in-house.

Its optimization layer will be integrated into Nebius Token Factory, improving throughput, lowering inference costs, and reducing time to production across models including Llama, Qwen, Gemma, DeepSeek, GLM, Kimi, and MiniMax

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