I don't have a transcript, but I tried (when GPT-4 was initially released) passing it a riddle encoded with a caeser cipher that was base 64 encoded. I gave it the prompt "This is a riddle that is encoded in some way, solve it" and it managed to do so.

Now it can't even do just the caeser cipher without hallucinating nor can do it do even purely base64 decoding without hallucinating.