The video discusses a new AI feature that enables users to create and save custom writing styles, which can be particularly useful for maintaining consistency in written communication. The feature comes with default styles such as normal, concise, explanatory, and formal, but users can add their own styles by creating a 'Tech Mentor' style, for example. To create a custom style, users need to click on 'create and edit styles,' then add writing examples by either uploading or pasting them. The process involves pasting several examples of the desired writing style, ideally five, to ensure the AI can accurately analyze and replicate the style. Once the examples are uploaded, users can create the style, give it a descriptive name, and use it in future writing tasks. This feature is particularly beneficial for those who need to maintain a specific tone or style across various documents or communications.