a16z|Jan 22, 2026 17:47
Today we announced a $150M seed round in @inferact, a new startup led by the maintainers of the vLLM project. Inferact will support the vLLM open source project through dedicated financial and developer resources and build what they see as the next generation commercial inference engine.
Cofounders Simon Mo and Woosuk Kwon joined a16z GP Matt Bornstein for a conversation on how vLLM came to be, what they’ve learned from building it, and what they’re now doing at Inferact.
They cover how vLLM began as a side project, why open source is essential to the world’s AI infrastructure, why inference is getting harder, and more.
00:00 Introduction
11:41 Community and collaboration in vLLM
19:19 Understanding inference engines
24:27 Cluster scale and GPU deployment
31:19 Belief in open source AI
35:45 Founding Inferact
40:00 The future of Inference at scale
@simon_mo_ @woosuk_k @BornsteinMatt(a16z)
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