Last updated: (JST)
OpenAI Introduces ChatGPT Atlas — A New Sidebar AI Assistant, Now Available on macOS
On October 21, 2025, OpenAI announced ChatGPT Atlas, a new browser assistant that lets you access ChatGPT from a sidebar to summarize pages, compare information, and research without switching tabs. Atlas is available now on macOS worldwide, with Windows, iOS and Android support coming soon.
In this article
1. What is ChatGPT Atlas?
Atlas is a sidebar AI assistant integrated into your browsing and app workflow. You can open it on the side of your screen, ask questions about the page you’re viewing, and get summaries, explanations, or rewrites instantly.
2. Availability
- macOS: Available now to Free, Plus, Pro, Go, Business (beta), and selected Enterprise/Edu users.
- Windows / iOS / Android: In development — OpenAI says these platforms are “coming soon” (date not yet announced).
3. Key Features
- Summarize & Explain: Quickly condense long articles or documents.
- Compare: Structure comparisons of products, plans, or texts side by side.
- Research in context: Get related information without leaving the page.
- Polish & Translate: Rewrite text or translate between English and Japanese.
4. How to Start (macOS)
- Download the ChatGPT app for macOS from OpenAI’s announcement page.
- Open the “Ask ChatGPT” sidebar from the screen edge or via shortcut.
- Use commands like Summarize, Explain, or Compare directly while viewing a page.
