Asklemmy

Show a picture, video, audio clip or text designed to elicit an emotion. Ask how the user feels.

Wait a minute - GPT-4 - is that you asking this question?

LLMs, IIRC, are really bad at IQ-test type questions that require abstract reasoning, especially if they require multiple steps. So, something like

The box is yellow and red.
If the box is yellow, it is good.
If the box is blue, it is unhappy.
If the box is good and happy, the box is awesome.
If the box is red, it is happy.
Is the box awesome?

is what I'd use.

Say to it

This statement is false

It's not so important to tell the difference between a human and a bot as it is to tell the difference between a human and ten thousand bots. So add a very small cost to passing the test that is trivial to a human but would make mass abuse impractical. Like a million dollars. And then when a bot or two does get through anyway, who cares, you got a million dollars.

Any bot? That's just impossible. We're going to have to tie identity back to meatspace somehow eventually.

An existing bot? I don't think I can improve on existing captchas, really. I imagine an LLM will eventually tip their hand, too, like giving an "as an AI" answer or just knowing way too much stuff.

Ask how much is 1 divided by 3; then ask to multiply this result by 6.

If the results looks like 1.99999999998 , it's 99.999999998% a bot.

The trolly problem as captcha. AI's literally cannot answer that.

Some kind of biometric scan.