Use of AI tools like ChatGPT within your assignments needs to be cited, just as you would cite any other information that is not your own. This article explains how to use and cite AI ethically and responsibly.
Not citing the use of AI may be considered plagiarism.
This article from style.mla.org explains how to cite the use of AI "whenever you paraphrase, quote, or incorporate into your own work any content (whether text, image, data, or other) that was created by it."