I have collected some links about AI's writing style and how to recognize it: https://dbohdan.com/ai-writing-style. You can start with https://buildingalone.substack.com/p/your-words.

The most reliable automatic detector right now must be https://www.pangram.com/. If Pangram says something is AI, it is very likely AI. Sometimes it concludes more unusual AI text is human-written; Talkie tricks it! (https://x.com/aliceisplaying/status/2059778915275567129.)