After helping President Trump get elected, Elon Musk was poised to dominate the country’s A.I. policies. Then Mr. Altman sneaked into the White House.

OpenAI, Oracle and SoftBank formed a new joint venture called Stargate to invest in data centers, building on major U.S. investments in the technology.

The agency sent OpenAI, which makes ChatGPT, a letter this week over the chatbot’s potential harms and the company’s security practices.