› For writing in Word, the built-in Copilot in Microsoft 365 Personal is a convenient choice - it drafts text, rewrites paragraphs and summarizes documents without making you copy text into a browser.
› If you write only occasionally, try free ChatGPT with pasted text or an uploaded .docx file.
› If you use Copilot every day, Microsoft 365 Premium offers a higher AI limit.This is one of the short answers in our Which AI for what?
› I checked the options on October 8, 2026.Three options: free, best for most people and advancedMy quick testYou cannot call Copilot in Word through an API, so I tested the task itself with the GPT-6.1 Sol model.