Our journalists Sheera Frenkel and Dylan Freedman break down what A.I. agents are, how they differ from chatbots and why A.I. companies are worried about them now.

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

© Manuel Orbegozo for The New York Times

The company’s researchers raised questions about the security of the model, known as GPT-6.1 Astra.

© Carlos Barria/Reuters

The Pentagon had “ample support for its conclusion” that the A.I. company’s products could pose a national security risk, according to a Washington appeals court.

© Manuel Orbegozo for The New York Times

The countries, along with Israeli firms, combined Chinese open-source A.I. models and A.I. agents for the campaigns, foreshadowing future online manipulation.

© Brian Stauffer

Researchers say artificial intelligence is developing faster than the systems put in place to monitor and control it.

© Jun Cen

Researchers say artificial intelligence is developing faster than the systems put in place to monitor and control it.

© Jun Cen

The government retaliated against the A.I. start-up “for constitutionally protected expressive activities,” a federal judge in California wrote.

© Karsten Moran for The New York Times

Irregular, an Israeli start-up, worked with OpenAI, Anthropic and Meta to assess the security of their A.I. models. It made a mistake. Then the tests went off the rails.

© Victor Arce