OpenAI has integrated ChatGPT directly into Microsoft Word starting September 17, 2026: A new sidebar designs texts from bullet points, shortens long documents, and adjusts headings. The feature costs nothing extra and works with the free ChatGPT account, provided a valid Word license is available.
ChatGPT moves in as a sidebar in Word
Until now, Word users had to switch to the browser for ChatGPT assistance, copy the text, and paste the result back into the document. This is no longer necessary: According to the official release notes from OpenAI, ChatGPT opens as its own window directly next to the Word document.
From there, bullet points can be transformed into complete text, highlighted passages can be rephrased, entire documents can be summarized, or headings and paragraphs can be rearranged. The conversation with ChatGPT remains intact, allowing results to be refined in multiple steps without having to rephrase the request each time. Word thus joins the same add-in family as ChatGPT for PowerPoint, which has worked similarly since August, as well as ChatGPT for Excel. Technically, it is an official Microsoft add-in, listed in the Microsoft Marketplace.
The sidebar drafts letters and reports from bullet points
In everyday work, this mainly saves the hassle of switching between programs and the tedious reformatting of copied text. Anyone who previously had to tidy up meeting notes in the browser and then paste them into the document can now stay entirely inside Word. An assistant only jotted down bullet points during a client meeting: deadline extension requested, delivery date pushed to November, new contact person at the client.
She opens the ChatGPT sidebar directly in her empty Word document, pastes in the notes, and asks for a formal customer letter with subject line and closing. Within seconds, a fully formatted letter appears in the document, which she only needs to check, adjust to the company’s tone, and send.
Likewise, a twenty-page report can be condensed onto one page with the key points, without uploading the text anywhere first. The sidebar also helps with fine-tuning: highlighting a paragraph and asking for a more neutral tone changes it right at that spot, instead of copying the result over from a chat window by hand.
The Word feature costs nothing on the basic account
The add-in works with any ChatGPT account, including the free tier – only the usual message limit of the respective plan applies here too. Free accounts and the low-cost Go plan use the GPT-5.6 Luna model, while Plus and Pro customers can choose between several models. According to OpenAI, business customers with an Enterprise license can also test the more powerful GPT-5.6 Sol model in Word for free until September 30, 2026. OpenAI does not mention a country restriction for the Word integration, so it should also be usable in Germany and the rest of Europe.
Here is how to set it up:
- In Word, open “Add-Ins” via “Insert” or “Home.”
- Search the add-in store for “ChatGPT” and add the official OpenAI add-in.
- Sign in with the existing ChatGPT account (Free, Go, Plus, Pro, or Business/Enterprise).
- Open the sidebar via the ChatGPT icon in the menu bar.
- Paste in bullet points or type a task such as “Summarize this document.”
A valid Word license remains a requirement, since the add-in does not replace Word itself. Anyone already using Copilot in Word gets a second, independent option alongside it – useful, for instance, when the pricier Copilot license is unavailable or a different writing style is needed, much like with Copilot’s own mail-merge feature.
What will matter is how reliably the sidebar handles confidential contract or customer data inside the document – anyone working with company internals should check internal guidelines on AI tools before the first use. It also remains open whether OpenAI will extend the feature in the coming weeks with German-language templates or closer integration with Outlook contacts.
