The brain is a lot about predicting situations/telling you what comes next and how to adjust your behavior to that prediction - i guess that is the common part with the LLM. The difference is that the LLM is predicting the most likely word, while the brain is matching a given situation/frame to your knowledge and past experience - it's about understanding stuff on a different level.
what i still don't get is how predicting the next word can come up with an answer that actually makes sense most of the time, that came as a big surprise to me...