OpenAI has completed a $40 billion funding round that places the company’s post-money valuation at $300 billion, according to Reuters. The deal adds fresh capital to one of the world’s most closely watched artificial intelligence firms and underscores continued investor appetite for the sector.

Microsoft and SoftBank led the round, with participation from Thrive Capital and Andreessen Horowitz. The size of the investment makes it one of the largest private financing deals in the technology industry and signals that major backers still see room for AI products and infrastructure to expand quickly.

The new valuation reflects how aggressively capital continues to flow into artificial intelligence, even as questions persist about profitability, compute costs, competition, and regulation. For OpenAI, the funding provides more resources to develop and scale its systems as rivals race to catch up.

The company’s rise has become a central storyline in the global tech market, where investors are betting that AI will reshape software, search, productivity tools, and enterprise services. This round further cements OpenAI’s place at the center of that shift.