You could use even ChatGPT 3.5, it's not only about AI, it's about your prompt.
In the prompt you need to ask him to make human look like mistakes (not adding perfect punctuation, not starting every sentence with a Uppercase, not using "diplomatic" style of writing, use synonyms, use chaotic structure of the text, don't add FAQ in each article (FAQ is not used for indexation anymore anyway), give him a donor website which writing style he must copy).
The problem with newest models is that they refuse to write article even in grey hat, and even in some white hat niches... So you either need a prompt that he will accept to write, an older model, a non censored model installed on your server/PC or even a paid non censored model.