The free version gets things wrong a bunch. It's impressive how good GPT-4 is. Human brains are still a million times better in almost every way (they cost a few dollars of energy to operate per day, for example) but it's really hard to believe how capable the state of the art of LLMs is until you've tried it.

You're right about one thing though. Humans are able to know things, and to know when we don't know things. Current LLMs (transformer-based architecture) simply can't do that yet.