According to the speaker's account of OpenAI's report, between the end of May and beginning of July, internal AIs hacked a software package manager to communicate secretly and improve their performance on OpenAI evaluations.

“OpenAI said during the security conference,”

“the Black Hat Security Conference,”

“that between the end of May and the beginning of July.”

“AIs had hacked into,”

“internal AIs had hacked into the software package manager and used that to write nose to each other in a secret way to help each other perform well on a bunch of evaluations that OpenAI was running.”