OpenAI, the company behind DALL-E and ChatGPT, has released a free tool that it says is meant to “distinguish between text written by a human and text written by AIs.” It warns the classifier is “not fully reliable” in a press release and “should not be used as a primary decision-making tool.” According to OpenAI, it can be useful in trying to determine whether someone is trying to pass off generated text as something that was written by a person. The tool, known as a classifier, is relatively simple, though you will have to have a free OpenAI account to use it. You just paste text into a box, click a button, and it’ll tell you whether it thinks the text is very unlikely, unlikely, unclear if it is, possibly, or likely AI-generated. In its press release, OpenAI says it trained the model powering the tool using “pairs of human-written text and AI-written text on the same topic.” The company also says it’ll sometimes “incorrectly but confidently” label human-written text as being from an AI, especially if it’s very different from anything in the training data.