Rampant enthusiasm is buoying tech shares to levels that defy gravity. Invest with caution, our columnist says.

Strong investor interest in SpaceX could be good news for the A.I. rivals, which have signaled that they, too, intend to go public this year.

Two Times tech reporters and their editor talk about assessing the sky-high valuation of the rocket and satellite maker, the potential economic impact of its public debut and the role of the world’s richest man in it all.

SpaceX will not raise money from investors in China and Hong Kong. Others firms, like OpenAI, may follow suit.

President Trump touched on what is an increasingly hot topic in Washington: how average Americans can get a piece of the tech industry’s A.I. windfall.

In the race to dominate the artificial intelligence industry, companies like SpaceX and Alphabet are borrowing cash and raising equity from investors at the fastest pace in decades.

Called Claude Fable 5, it is twice as expensive as the company’s previous flagship system.

Plus, “I’m busy, but you can talk to my A.I. twin.”

Outside groups have spent roughly $12 million to support or oppose Mr. Bores’s campaign for a House seat in Manhattan, elevating his name in a crowded race.

The artificial intelligence company, which is racing rival OpenAI to the stock market, has seen explosive growth over the last year thanks largely to technology that can automatically write computer code.

We’ve heard a lot about what it can do for businesses, and for individuals, but what about society?

One is allied with Anthropic. The other is tied to OpenAI. They’re both spending millions to influence the midterms, and they’re leaving a trail of fearful candidates and canceled ads in their wake.

The American pope wants to take artificial intelligence down a notch. Is he challenging the tech companies, or will tech take over the papacy?

The government’s A.I. Security Institute, staffed by alumni from OpenAI and Google, is becoming a model for countries grappling with A.I.’s emerging risks.

Ishmael Reed, provocateur and playwright, has a few words for the billionaires of Silicon Valley.

The latest artificial intelligence models from Anthropic and OpenAI are extending the United States’ lead over China and intensifying the rivalry between the countries.

Greg Brockman, OpenAI’s president, testified in a trial pitting Mr. Musk against his company that the world’s richest man was eager to change how it operated as a nonprofit.

The Trump administration, which took a noninterventionist approach to artificial intelligence, is now discussing imposing oversight on A.I. models before they are made publicly available.

The agreements with the technology companies come amid the Defense Department’s dispute with Anthropic.

Chris Larsen, who hails from California, plans to spend $3.5 million to help Alex Bores, a New York congressional candidate at the center of a proxy war over A.I. regulation.

In the trial’s first day of testimony, Elon Musk said greed led co-founder Sam Altman to pull the A.I. lab away from its nonprofit roots. OpenAI says that’s nonsense.

Mr. Musk’s posts on X have pushed his narrative that OpenAI has lost its way.

Elon Musk, Sam Altman and several other key artificial intelligence industry figures are slated to testify in the trial, which is expected to last several weeks.

Mr. Musk’s lawsuit against Mr. Altman and OpenAI makes the case that all-encompassing greed is Silicon Valley’s defining feature.

Cohere is acquiring Aleph Alpha in a deal aimed at customers uneasy about the dominance of American companies in artificial intelligence.

Mr. Altman, who has faced criticism over OpenAI’s direction, has culled company projects and is trying to be more disciplined with strategy.

The maker of ChatGPT is taking a more open approach to cybersecurity than its chief rival, Anthropic.

A jury trial that is set to start on Monday could shift the course of the A.I. race, with Mr. Musk seeking billions of dollars in damages from Mr. Altman’s OpenAI.

The investigation focuses on messages between the chatbot and the man accused of killing two people at Florida State University last year.

For us to trust it on certain subjects, researchers in the growing field of interpretability might need to learn how to open the black box of its brain.