Elon Musk’s rocket and satellite giant is already planning a stock sale at an $800 billion valuation. Going public could put it in the trillion-dollar club.

© Meridith Kohut for The New York Times

Shares in the technology company are down as investors grow anxious that its bet on artificial intelligence, and OpenAI in particular, may not pay off.

© Haiyun Jiang for The New York Times

President Trump’s move fulfills a major goal of the chipmaker. But the move faces opposition in Washington — and uncertainty in Beijing.

Anthropic, the artificial intelligence start-up, said that Chinese state-sponsored hackers used its tools in a widespread attack.

The highly anticipated event covered a lot of ground on tariff and trade barriers, but questions remain about reaching a lasting accord.

Investors sent major global indexes higher on optimism that President Trump and China’s top leader, Xi Jinping, could reach a wider agreement this week.