Predicting the next sentence is exactly what our brain does, it's in every introductory neuroscience book. Our brains are not that special, they just had a LONG time to come up with hacks to adapt to a very variable world.
That's not true. Our brains process other input such as stimuli from our senses, past experience, and inherent goals we want to achieve. Language models predict the next sentence based on the previous text. There's a clear difference between the capabilities of a brain and language models, and I'm a little bewildered this needs pointing out.
"Not special" is an interesting way to describe the single most complex thing we know of.