GPTinf is a tool designed to rephrase AI-generated content to bypass detection by AI plagiarism detectors such as GPTZero. By using algorithms, GPTinf modifies the text in an undetectable way. Although the tool may occasionally require more than one attempt and may create unintentional grammatical errors, it is continuously improving. GPTinf is advantageous because it is faster than GPTZero and rephrases text without resorting to font tricks, grammatical errors, or non-English symbols. It is useful for content creators, researchers, and students and is available via API with a free trial on the GPTinf website.