ChatGPT Atlas vs Perplexity Comet (2026): Atlas is shut down, here is what replaces it
This page used to be a head-to-head. It is not one any more: OpenAI deprecated ChatGPT Atlas, and it was scheduled to stop working on August 9, 2026. OpenAI moved Atlas's browser agent into ChatGPT itself. Perplexity Comet is still here, on every major platform, with a free version. Here is what changed and what to use now.
Quick answer
- You want a standalone AI browser: Perplexity Comet. It is the one of the two that still exists, it has a free version, and it runs on Mac, Windows, iOS, and Android.
- You used Atlas for its agent and pay for ChatGPT: move to the ChatGPT desktop app, which OpenAI built as the successor for browser-based agentic work.
- Still have Atlas installed: export bookmarks and anything else you need; it may no longer open.
Built for doing, now inside ChatGPT
Atlas was a browser wrapped around ChatGPT, tuned for executing web tasks with an agent that could use your tabs. Its agent mode was paid (Plus, Pro, Business). The agent now lives in the ChatGPT desktop app: multiple tabs, downloads, navigation, and account logins.
Built for knowing, still standalone
A research-first Chromium browser: highlight anything on a page and ask about it, with answers and citations inline. A free version is included in Perplexity's free tier; Pro and Max add higher limits and stronger agent models. On all four major platforms since March 26, 2026.
Then and now
| Factor | ChatGPT (Atlas, now desktop app) | Perplexity Comet |
|---|---|---|
| Status | Atlas shut down Aug 9, 2026; agent moved into ChatGPT | Active |
| Core philosophy | Doing (automation) | Knowing (research) |
| Best at | Multi-step task execution | Research, synthesis, citations |
| Agent access | Paid ChatGPT plans | Free version; stronger agent on Pro and Max |
| Form factor | Inside the ChatGPT desktop app | Standalone browser you can set as default |
| Platforms | Wherever the ChatGPT desktop app runs | Mac, Windows, iOS, Android |
Doing vs knowing still decides it
OpenAI's side is a doer. Atlas was essentially a browser wrapped around ChatGPT, optimized for delegating: point it at a multi-step job (find, compare, book, summarize) and its agent works across tabs. That capability did not disappear with Atlas; it moved into the ChatGPT desktop app, and it still sits on paid plans. If your daily friction is repetitive web workflows and you already pay for ChatGPT, that is where to go.
Comet is a knower. It is built for research: highlight text on any page and ask about it, and answers arrive inline with visible sources, so you never lose the thread of where information came from. For anyone who spends the day reading, comparing sources, and synthesizing, Comet keeps the evidence next to the answer, and it remains a real browser rather than a feature inside a chat app.
Which should you use now?
- You research, read, and synthesize all day: Comet. Sources stay next to answers, and the free version covers the basics.
- You automate repetitive multi-step web tasks and pay for ChatGPT: the ChatGPT desktop app, Atlas's direct successor.
- You want a standalone AI browser on Windows or mobile: Comet, which has apps for Windows, iOS, and Android as well as Mac.
- You were an Atlas user: export your data, then pick by job: Comet for a browser, the ChatGPT desktop app for the agent.
Need an agent that automates tasks, not just a browser?
See how the dedicated browser-automation agents compare.
FAQ
Is ChatGPT Atlas still available?
No. OpenAI deprecated Atlas and it was scheduled to stop working on August 9, 2026. OpenAI moved browser-based agentic work into ChatGPT and Codex and points users to the ChatGPT desktop app for agentic browsing. If you still have Atlas installed, export anything you need; it may no longer open or browse.
What replaces ChatGPT Atlas?
The ChatGPT desktop app, which OpenAI says supports browser-based agentic workflows with multiple tabs, downloads, improved navigation and account login support. Agent features in ChatGPT sit on paid plans, as Atlas agent mode did (Plus, Pro and Business).
Is Perplexity Comet free in 2026?
Perplexity says it will always provide a free version of Perplexity for all users, and that it includes Comet. Paid plans (Pro and Max) add higher limits and stronger models for the Comet agent. Comet has been available on Mac, Windows, iOS and Android since March 26, 2026.
Should I switch from Atlas to Comet?
If you used Atlas as a browser, Comet is the closest standalone AI browser still available, and it runs everywhere. If you used Atlas mainly for its agent and already pay for ChatGPT, the ChatGPT desktop app is the direct successor and keeps you in the same account and history.
Do AI browsers like Comet replace Chrome?
They can. Comet is a full Chromium-based browser you can set as default, so extensions and habits mostly carry over. Many people run it alongside Chrome at first, keeping Chrome for logins and legacy sites.
Bottom line
The Atlas versus Comet question has answered itself: Atlas is gone. OpenAI shut it down on August 9, 2026 and folded its browser agent into the ChatGPT desktop app, still on paid plans. Comet is the standalone AI browser that remains, with a free version and apps for Mac, Windows, iOS, and Android. Pick Comet if you want a research-first browser; pick the ChatGPT desktop app if what you valued in Atlas was the agent and you already pay for ChatGPT. Want the automation layer specifically? Compare the dedicated AI browser agents. And before you let any of them act on your behalf, read are AI browsers safe? on the prompt-injection risk they share.
Standards and research behind this page
Claims about what an AI tool can and cannot do are easiest to check against the standards bodies and research groups that measure these systems rather than against any vendor's own description. The sources below are the primary ones, linked so a reader can verify a claim here without taking this page's word for it.
- NIST AI Risk Management Framework is the US federal reference for evaluating and governing AI systems, including how their capabilities and limits should be characterised.
- NIST AI RMF Knowledge Base sets out the measurable characteristics of a trustworthy AI system, which is the vocabulary these comparisons use.
- Stanford HAI AI Index publishes the annual measured benchmarks on model capability, cost and adoption that vendor claims are checked against.
- National Science Foundation AI programme funds and documents the underlying research these products are built on.
- arXiv cs.AI carries the primary papers behind most model capability claims, usually months before a product mentions them.
- FTC Endorsement Guides governs how a review or recommendation must disclose a material connection, which is why the disclosure on this page exists.
- US Copyright Office states what copyright covers, which decides who owns the output of a generative tool.
- Section 508 defines the federal accessibility requirements a tool must meet to be usable in public-sector work.
This page compares tools and does not endorse one. Capabilities and pricing change frequently, and a reader should confirm current behaviour with the vendor before relying on it.