The speaker argues that a model's ability to invent content is useful for fiction generation, since a fictional world would be poor if everything in it were factually true.

“is to do with this idea of like also personas or kind of in context learning because being able to make things up is actually a useful like useful capability for a model like if i ask it to write a story yeah if i wanted to generate a fictional world for me it's actually not a very good fictional world if everything is factually true so being able to make stuff up is a useful capability for a model and sometimes it has to figure out in context that this is what we're doing so if you imagine from sort of”