ChatGPT creator OpenAI has introduced a web-based tool that it says can distinguish between AI and human-written texts.  The AI Text Classifier is free for users with an OpenAI account. To utilize the tool, users paste in text, and the AI program will label it as "very unlikely," "unlikely," "possibly," or "likely" that the words were created using AI. It also has a fifth category saying it's "unclear if the text is" AI-generated. The tool, described as "a fine-tuned GPT model," also requires at least 1,000 characters, or 150 to 250 words, to work. According to OpenAI, the classifier was able to identify around 26% of content as "likely AI-written" in tests, making it not especially accurate. It also incorrectly labeled human-written text as AI-written 9% of the time. OpenAI acknowledged the tool's limitations, saying that it can be used for now to complement other ways to determine if text is from an AI generator.