alt Hacker News> because 'I don't know' is not in the vocabulary of any AI.
That is clearly false. I’m only familiar with Opus, but it quite regularly tells me that, and/or decides it needs to do research before answering.
If I instruct it to answer regardless, it generally turns out that it indeed didn’t know.
I haven't had that at all, not even a single time. What I have had is endless round trips with me saying 'no, that can't work' and the bot then turning around and explaining to me why it is obvious that it can't work... that's quite annoying.