Artificial intelligence is expensive to use, many companies discovered. That has led to a new era of saving costs.

Elon Musk’s rocket company said it would sell more than 555 million shares at $135 each in its blockbuster initial public offering, which is set to begin trading on Friday.

Elon Musk’s rocket company is spending big and losing money. That has raised questions about whether it can justify its valuation for its blockbuster initial public offering.

As co-chief executive of the start-up Prometheus, the Amazon founder is using A.I. to improve how devices ranging from computers to jet engines are made.

While Elon Musk may soon become a trillionaire, his rocket company’s market debut is set to change the lives of its current and former employees, too.

OpenEvidence, a fast-growing start-up, is using artificial intelligence to help doctors find answers to clinical questions for diagnosis and treatment.

Elon Musk’s rocket company, on the cusp of the largest initial public offering ever, will soon end up in index funds after rule changes by Nasdaq and other index providers.

A San Francisco start-up called Arena found that people are most likely to use A.I. agents on the job, particularly if they are in the tech industry.

The $135 share price means Elon Musk’s rocket maker is poised to exceed the 2019 initial public offering of Saudi Aramco in both valuation and money raised.

Anthropic raised $65 billion in new fund-raising that put its value at $900 billion, ahead of OpenAI’s last valuation of $730 billion, as the companies duel for A.I. dominance.

A Mad Hatter and a giant rabbit sit around a table discussing an A.I. start-up. This is normal behavior around the Bay Area these days.

The dream of clean hydrogen has tantalized energy experts for years, but producing it has been tough. Many start-ups think the answer could lie beneath our feet.