Nvidia in September announced plans to invest up to $100 billion in OpenAI, though the company subsequently noted that it hadn’t struck “definitive agreements” around that money. Investors in artificial-intelligence stocks may be getting a lesson about the difference between press-release hype and reality.In September, Nvidia announced, to some fanfare, its intention to make an OpenAI investment, and shares rose 4% that day. But critics took issue with the arrangement and the optics of Nvidia making such a large investment in one of its customers.While Nvidia shares have gained about 2% so far this year, edging out the S&P 500 SPX over that span, investors seem more focused on whether AI will deliver a meaningful and broad-based financial payoff, as evidenced by the sharply negative reaction to Microsoft’s (MSFT) earnings last week. Are AI stocks starting to fall ?

