The pause letter proposed delaying GPT-5 development because GPT-4 had alignment problems, using the delay to work on safety.

“the the part of the pause letter that made me sign it that i like the best was it said let's pause this particular thing that we know is problematic in certain ways i mean it was really about delaying the development of gpt5 which ironically still doesn't exist two and a half years after some of us signed the pause letter um but the notion was we would pause the development of gpt5 because we”

“Because we knew that GPT-4 had certain kinds of problems around alignment and that we would spend that time instead working on safety.”