$3.4K is about what you might pay a magic circle lawyer for an opinion on a matter. Not saying o3 is an efficient use of resources, just saying that it’s not outlandish that a sufficiently good AI could be worth that kind of money.
On the bottom of ChatGPT.com I see a disclaimer: “ChatGPT can make mistakes. Check important info”.
I don’t think you can succesfully sue with such caveat emptor.