As Mr. Musk entered President Trump’s orbit, his private life grew increasingly tumultuous and his drug use was more intense than previously known.

Employees and security researchers said they had cautioned the company on safely testing its A.I. models and strengthening its corporate infrastructure, but OpenAI did not listen.

Group tech houses have proliferated across the San Francisco Bay Area in the artificial intelligence boom. One of the most prominent has also racked up an extensive police record.

Inside the 81-year-old billionaire’s risky, debt-fueled scramble to transform his data empire into an A.I. juggernaut.

The billionaire has stated many plans for his businesses, but has delivered only some of what he said he would, when he said he would, according to a Times analysis.

The billionaire has stated many plans for his businesses, but has delivered only some of what he said he would, when he said he would, according to a Times analysis.

The rocket maker has been a useful financial tool for Mr. Musk, providing the billionaire with loans and aiding his struggling companies, a Times examination found.

Board members have reaped hundreds of millions from stock awards and separate investments, even as some have done drugs with Musk; former Tesla director Larry Ellison offered him a chance to dry out.

Tesla chief’s liaison with Google co-founder’s wife led to couple’s divorce filing, according to people familiar with the matter.

Behind the scenes, what led up to the spectacular flame-out of the Trump-Musk relationship and public feud.

That control is starting to fray as Mr. Johnson, a longevity guru known for performing experiments on his body, faces a backlash over the agreements.

Simmering anger at the billionaire’s unchecked power spilled out in a remarkable Cabinet Room meeting. The president quickly moved to rein in Mr. Musk.

As the billionaire warns of population collapse and the moral obligation to have children, he’s navigating his own complicated family.

At a time when the U.S. government is concerned about its reliance on a mercurial billionaire for access to space, new competitors say Elon Musk’s SpaceX is using tactics intended to squash them.

Government investigations into Mr. Musk’s companies are stalling from President Trump’s firings and Biden administration resignations.

The engagement is the latest sign of the billionaire’s expanding influence across the government, which already stretches into more than half a dozen agencies.