Lightspeed Venture Partners, a Silicon Valley venture firm, has amassed more than $9 billion to invest in artificial intelligence. That is its biggest haul.

© Gabriela Hasbun for The New York Times

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

The company claimed that A.I. did most of the hacking with limited human input and said it was a rapid escalation of the technology’s use in cybercrime.