The Chinese start-up used several technological tricks, including a method called “mixture of experts,” to significantly reduce the cost of building the technology.

The tool, called Deep Research, arrives days after OpenAI released another one, which shops for groceries and books restaurant reservations.

How did a little-known Chinese start-up cause the markets and U.S. tech giants to quake? Here’s what to know.

The new tool, called Operator, can shop for groceries or book a restaurant reservation. But it still needs help from humans.

The artificial intelligence start-up said the new system, OpenAI o3, outperformed leading A.I. technologies on tests that rate skills in math, science, coding and logic.

Google unveiled an experimental machine capable of tasks that a traditional supercomputer could not master in 10 septillion years. (That’s older than the universe.)

The chief executive of OpenAI said the technology would boost productivity and rejected worries that his rival mogul could use his political influence to harm…

The oil company was indicted on charges of dumping nearly 800,000 gallons of contaminated wastewater into the Los Angeles County sewer system.

Housebound during a 1978 blizzard, he and a friend began devising the first computer bulletin board, a forerunner of online services like Reddit, TikTok and…

Chatbots like ChatGPT get stuff wrong. But researchers are building new A.I. systems that can verify their own math — and maybe more.