A leading Chinese A.I. start-up released its latest model and made the case that China’s embrace of open software is safer than Silicon Valley’s closed approach.

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

In an open letter, OpenAI, Anthropic, Google and others said that a wave of A.I.-enabled cyberattacks was coming and that organizations and governments needed to prepare themselves.

© Anna Rose Layden/Reuters