The GPT Sheets Add-on offers a convenient method to utilize the robust capabilities of OpenAI GPT-3 directly within Google Sheets. It introduces two straightforward custom functions: =GPT and =GPT_LIST, which can be applied for various tasks such as brainstorming blog post concepts, composing paragraphs or instructions, organizing lists, categorizing reviews, summarizing content, crafting responses to comments, and experimenting with hyperparameters. This add-on is available for free, with the sole expense being the API cost from OpenAI.