OpenAI is finalizing a massive funding round led by SoftBank Group Corp. that would value the artificial intelligence pioneer at roughly $300 billion, cementing its status as the world’s most valuable AI startup. The $40 billion transaction, which would be the largest single private funding round in technology history, nearly doubles OpenAI’s previous valuation of $157 billion set last year.
The staggering capital commitment underscores the true cost of pursuing artificial general intelligence (AGI). According to people familiar with the matter, the funding is structured in tranches, with the full $40 billion contingent on OpenAI completing its transition from a non-profit-controlled structure to a more conventional for-profit entity.
For SoftBank founder Masayoshi Son, anchoring this round represents a return to aggressive, market-defining bets, positioning the firm as OpenAI’s primary strategic partner. The move suggests Son is looking to own the entire AI stack, from the silicon provided by SoftBank-owned Arm to the frontier models developed by Sam Altman’s team.
The $500 Billion Infrastructure Moat
A primary driver for the capital raise is the Stargate initiative, a $500 billion blueprint for next-generation AI infrastructure. This plan involves building massive data center complexes across the U.S. in partnership with tech giants like Microsoft, Nvidia, and Oracle. The capital will be used to secure specialized silicon, ensuring OpenAI is not bottlenecked by the global GPU shortage.
At a $300 billion valuation, OpenAI is resetting the pricing benchmarks for the entire AI ecosystem. The sheer size of the round creates a "capital moat," making it increasingly difficult for rival foundation-model players such as Anthropic or Mistral to raise at the scale necessary to keep pace. As one analyst noted, the winner of the AGI race will have the most power, the most chips, and the deepest pockets. The cash infusion provides the necessary runway to accelerate OpenAI’s roadmap toward scientific discovery models and expand its enterprise tooling.
