What actually happened here
An earlier version of this article claimed "we tested" both browsers side by side with a fabricated scorecard. That never happened — a September 2026 audit found no evidence behind it. Rewriting it honestly surfaced something more important: one half of the original comparison no longer exists as a product.
📢 The headline fact
Per OpenAI's own Help Center, ChatGPT Atlas launched October 21, 2025 and was deprecated, scheduled to stop working on August 9, 2026. OpenAI moved browser-based agentic capabilities into the main ChatGPT app and Codex instead. A "Comet vs Atlas" head-to-head is no longer a live comparison — it's Comet versus a discontinued product.
What OpenAI itself says about Atlas
OpenAI's Help Center article, titled "Evolving Atlas into ChatGPT for browser-based agentic work," states plainly: "We're deprecating Atlas and moving browser-based agentic capabilities into ChatGPT and Codex." The article instructs users to export bookmarks and browsing data before the shutdown date, and points them to the ChatGPT desktop app and the ChatGPT Chrome extension or sidebar as the supported paths going forward.
This matters for marketers who may have adopted Atlas for competitor research or drafting workflows in late 2025 or early 2026: any process built around the standalone Atlas browser needs to move to the ChatGPT desktop app or Chrome extension, per OpenAI's own migration guidance.
What's actually still real: Perplexity Comet
Comet, unlike Atlas, is a live, currently available product. Per Perplexity's own Comet page and its announcement blog post, Comet is a Chromium-based browser with an AI assistant built in, launched as a paid desktop product in mid-2025 and made available free worldwide across desktop and mobile in 2026.
Per Perplexity's own materials: a Chromium-based browser with an AI assistant that can browse pages with you, answer questions about open tabs, and take agentic actions such as research and task completion. Available on macOS, Windows, Android and iOS.
This is a real, currently maintained product — unlike Atlas, which is no longer supported as of August 9, 2026.
What this means for marketers evaluating AI browsers
Rather than a task-by-task scorecard between two products (one of which no longer exists), the honest guidance is:
- If you want a standalone AI-native browser today, Comet is a real, currently available option, confirmed directly on Perplexity's own site.
- If you want ChatGPT's capabilities inside your browsing workflow, per OpenAI's own guidance, that now means the ChatGPT desktop app or the Chrome extension/sidebar — not a separate Atlas browser.
- If you built a workflow around Atlas, OpenAI's Help Center has a direct migration guide for exporting bookmarks and moving to the supported alternatives before old references break.
This is also a useful reminder about how fast the AI browser category is moving: a comparison written in August 2026 was already obsolete by September 2026. Before publishing or acting on any "tool X vs tool Y" comparison in this space, verify both products are still live on the vendors' own sites first.
The real risk with agentic browsers, still true
One thing that hasn't changed: agentic browser tools that can click, fill forms, and take actions on your behalf carry real risk regardless of vendor. OpenAI's own Atlas shutdown guidance specifically warns users to treat cookie and session files as sensitive data and not share them casually. That guidance applies just as much to Comet or any future agentic browser as it did to Atlas.
Treat agent actions the way you'd treat a new hire's first week: let them draft, research, and summarize freely, but review anything before it submits, publishes, or pays.