It's not even a cipher, it's just an encoding. Nobody would be surprised if chatgpt would be able to also understand e.g. utf-16.
What's interesting here is that base64 does not have the exact same byte sequence (such as a single space) between tokens. So I still think for it to understand base64 is a bit surprising.
What's interesting here is that base64 does not have the exact same byte sequence (such as a single space) between tokens. So I still think for it to understand base64 is a bit surprising.