It’s undetectable. It’s not plagiarism. And it’s only going to get better. It’s ChatGPT. ChatGPT is a new AI (Artificial Intelligence) software offering (November 2022) that will write anything you want, really well.
You can use it to write a paragraph, an essay, a script, computer code, and a poem, of almost any length. A class full of students can write an essay on the same topic and get really good and different results.
Check it out at https://chat.openai.com/.