I put in a moderately specialist topic I'm reasonably expert in. What it wrote was highly convincing. While I wouldn't be particularly impressed, I absolutely couldn't distinguish it from a mediocre human. It's really quite terrifying to think of the internet filling up with this garbage.

It writes very convincing pop-sci articles about high energy photons and the like. I see no way how even a proper AI can distinguish it from similar articles written by journalists.