ChatGPT Desktop Browser vs Chrome Extension vs Comet (2026)
The four options compared
| ChatGPT desktop built-in browser | ChatGPT Chrome extension | Perplexity Comet | Gemini in Chrome | |
|---|---|---|---|---|
| What it is | Browser inside the unified ChatGPT desktop app (July 9, 2026) | Side panel + agent inside your Chrome | Standalone AI browser | Gemini side panel + “auto browse” in Chrome |
| Extensions | Chrome extensions, since Sep 18, 2026 | Uses your Chrome’s extensions | Chromium-based; extensions supported | Native Chrome extensions |
| Profile | Own state; no Chrome cookies/sessions imported by default | Your Chrome profile | Its own profile, imports on setup | Your Chrome profile |
| Agent acts for you | Yes, with per-site approval | Yes (ex-Atlas Agent Mode) | Yes | Yes — auto browse, AI Pro/Ultra, US only |
| Agent ↔ extensions | Walled off (no shadow DOM or extension access) | Runs in the same profile | Same profile | Same profile |
| Admin controls | Disable browser, site rules, block imports, no user override | Workspace policies | Limited | Google Workspace policies |
| Platforms | macOS, Windows | Chrome, Edge, Brave, Opera, Vivaldi | Mac, Windows, iOS, Android | Chrome desktop |
| Price | ChatGPT plans (free tier included) | Free with ChatGPT account | Free with limits | Free; auto browse needs AI Pro/Ultra |
Verified September 20, 2026 against OpenAI’s help-centre documentation for the built-in browser and enterprise browser policy, and the launch thread from OpenAI’s James Sun.
What OpenAI shipped on September 18
Since ChatGPT Atlas shut down on August 9, 2026 (see what to use instead of Atlas), OpenAI has offered two browser routes: a browser built into the ChatGPT desktop app and a Chrome extension. The built-in browser’s weakness was that it was a stripped-down environment — no password manager, no developer tools, none of the extensions people actually run their day through.
On September 18, 2026 OpenAI turned on Chrome extension support in that browser. You can install and pin extensions from the Chrome Web Store, and they persist alongside the browser’s own cookies, downloads and saved passwords. 1Password was the example OpenAI used; the point is that the in-app browser can now be a primary work browser rather than a sandbox you visit.
Two design choices define it:
- Separate state. OpenAI’s documentation says the built-in browser maintains its own state and does not inherit your Chrome profile, cookies, signed-in sessions or extensions. Cookies created inside it do persist.
- The agent stays outside the extensions. James Sun stated that the agent “cannot interact with any shadow DOM or extensions,” so it cannot use an extension to extract information or escalate privileges. A human can use 1Password to sign in; the agent cannot open 1Password. That is OpenAI’s description of the boundary, not an independent audit.
Around the agent itself, ChatGPT asks for approval before using a new website unless the host is already allowed or broader permissions were granted, treats web content as untrusted, and tells users to type credentials into the browser rather than into chat.
The ChatGPT Chrome extension — when you need your real profile
The extension is where Atlas’s agentic features went. It runs as a side panel in Chrome (and Edge, Brave, Opera, Vivaldi), keeps context across open tabs and can run browser tasks from the desktop app. OpenAI directs users to it when a task depends on an existing Chrome profile, open tabs or authenticated sessions stored in Chrome. The trade-off is the mirror image of the built-in browser: maximum convenience, and an agent operating in the same profile as your bank.
Perplexity Comet — the standalone alternative
Comet remains the most complete standalone AI browser: a real browsing agent, free with usage limits, and the only major option on Mac, Windows, iOS and Android. It supports Chromium extensions. Its agent runs inside your logged-in sessions, which is exactly the surface OpenAI chose to wall off. Model choice is Perplexity’s routing, not yours. See Firefox Smart Window vs Gemini in Chrome vs Comet for the privacy-first alternative.
Gemini in Chrome — the incumbent’s side panel
Gemini in Chrome gives you a Gemini-only assistant plus “auto browse,” which can research and complete multi-step tasks across sites — but auto browse is limited to Google AI Pro and Ultra subscribers in the US. It lives in your normal Chrome profile with normal Chrome extensions and Workspace admin policies. It is the natural choice if you already pay Google and want the agent where your tabs are.
Enterprise controls: where OpenAI is ahead
OpenAI’s enterprise browser policy is the most specific agent-browser governance published so far. Workspace admins can:
- disable the in-app browser entirely;
- prevent ChatGPT from using websites at all;
- restrict browser-history access;
- block imports of cookies, passwords and browsing history from outside browsers;
- set site-level rules for access, uploads, downloads and advanced browser control.
Users cannot override those rules with their own approvals. For security teams that have been asking how to let staff use an agentic browser without letting the agent near production admin panels, this is the first mainstream answer. Compare with the guidance in how to deploy a computer-use agent safely.
Which to choose
- You want one place where ChatGPT works and you work, with your password manager, and you are willing to sign in fresh: the built-in browser, now that extensions exist.
- The task needs sessions already in Chrome: the Chrome extension — but keep a separate Chrome profile for agent use.
- You want an agent browser on your phone, or you are not a ChatGPT subscriber: Comet.
- You live in Google Workspace and pay for AI Pro/Ultra: Gemini in Chrome.
- You manage a fleet: the ChatGPT desktop browser is the only one with per-site, non-overridable agent policy today.