Sam Altman says parts of the AI compute buildout are getting silly, and that warning is already splitting AI stocks into winners and losers.

• Altman says he trusts OpenAI's own buildout but fears the rest of the world is building compute nobody has the revenue to pay for.
• Nvidia's near-$14 billion Hugging Face deal looks like a way to soak up spare data center capacity it already committed to lease.
• The split is between top-end AI compute, which may be oversupplied, and business-level AI compute, which is booming.
• Dell and Cerebras jumped on the business-AI trade while Credo sank 20% after its costs rose much faster than sales.
• CoreWeave is the weak link: it has three dollars of short-term debt for every dollar of cash and is heavily tied to the top-end chips.

Outlook: If demand keeps shifting toward cheaper business-level AI hardware, the debt-heavy cloud startups suffer and even Nvidia's fat profit margins get squeezed.