Inferact raises $150M seed round to scale the vLLM inference engine

The startup founded by vLLM's core maintainers hit an $800 million post-money valuation with backing from Andreessen Horowitz and Lightspeed Inferact, a San Francisco AI infrastructure startup founded by the people who maintain vLLM, has raised $150 million in seed funding. The round, announced on January 22, 2026, valued the company at $800 million post-money. The investor list includes Andreessen Horowitz and Lightspeed Venture Partners, among others. The pitch is simple: take one of the most widely used open-source tools for running large language models and build a commercial business around it, without closing the source. vLLM tackles inference efficiency with a technique called PagedAttention. The idea borrows from virtual memory, the trick operating systems use to juggle limited RAM across many programs at once.

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