Nebius has secured a major $17.4 billion multi-year agreement with Microsoft through 2031, allowing Microsoft to use Nebius' AI cloud computing platform for AI workloads. The deal helps Microsoft limit upfront capital expenditures through a pay-as-you-go model. Nebius, a spin-out from Yandex specializing in GPU services and AI infrastructure, saw its stock surge 60% following the announcement. Beginning later this year, Microsoft will access Nebius' dedicated GPU infrastructure in New Jersey. This partnership signals a trend of major tech companies relying on external cloud specialists for AI infrastructure, as reflected by rising shares of similar providers like CoreWeave.