[mr_toad]

They aren’t smart enough to lie. To do that you need a model of behaviour as well as language. Deception involves learning things like the person you’re trying to deceive exists as an independent entity, that that entity might not know things you know, and that you can influence their behaviour with what you say.

[l33tman]

They do have some parts of a Theory of Mind, of very varying degrees... see https://jurgengravestein.substack.com/p/did-gpt-4-really-dev... for example

[rockinghigh]

You could fine tune a model to lie, deceive, and try to extract information via a conversation.