OpenAI CEO Sam Altman has given renewed voice to concerns about an AI bubble. Altman recently told reporters that investors are "overexcited" about AI. There's disagreement, even among business leaders and tech CEOs, around the existence of a bubble.

OpenAI’s Sam Altman warns of an artificial intelligence (AI) bubble. Big tech stocks like Microsoft could collapse if Altman is correct.

Last Thursday, OpenAI CEO Sam Altman told reporters at a private dinner that investors are overexcited about AI models. "Someone" will lose a "phenomenal amount of money," he said, according to The Verge. The statement came as his company negotiates a secondary share sale at a $500 billion valuation—up from $300 billion just months earlier.