OpenAI released the AI classifier to identify AI-written text. The AI Text Classifier is a fine-tuned GPT model that predicts how likely it is that AI generated a piece of text. The model can be used to detect ChatGPT and AI Plagiarism, but it’s not reliable enough yet because actually knowing if it’s human vs. machine-generated is really hard.

“Our classifier is not fully reliable. In our evaluations on a “challenge set” of English texts, our classifier correctly identifies 26% of AI-written text (true positives) as “likely AI-written,” while incorrectly labeling human-written text as AI-written 9% of the time (false positives). Our classifier’s reliability typically improves as the length of the input text increases.”

Source: https://openai.com/blog/new-ai-classifier-for-indicating-ai-written-text/