ChatGPT Atlas vs Perplexity Comet: Which One Survived

This matchup ended on August 9, 2026, the day OpenAI shut ChatGPT Atlas down. Perplexity Comet is still here, still free, and now runs on Windows, macOS, Android and iOS, while Atlas never shipped on anything but the Mac. OpenAI announced the shutdown on July 9, 2026 and folded the browser’s agentic features into the ChatGPT desktop app and a Chrome extension.

So the honest answer to “Atlas or Comet” is that only one of them is still installable. This page keeps the original head-to-head as a record of how the two browsers actually compared, then rebuilds the useful comparison for today: Comet against the ChatGPT desktop app, which is what OpenAI replaced Atlas with.

The Key Takeaways

• ChatGPT Atlas shut down on August 9, 2026. Perplexity Comet is unaffected and still shipping updates.
• Comet runs on Windows, macOS, Android and iOS. Atlas was Mac-only for its entire run; its promised Windows, iOS and Android builds never arrived.
• Comet is free, with an optional Comet Plus at $5/month for premium publisher content, bundled free with Perplexity Pro and Max.
• The live comparison is now Comet vs the ChatGPT desktop app, which carries Atlas’s browsing and agent features and also runs on Windows and Mac.
• Both browsers had a serious agentic vulnerability disclosed within weeks of launch. Prompt injection is the category risk, not a bug either vendor has closed for good.

What happened to ChatGPT Atlas

Atlas launched for macOS on October 21, 2025 as a Chromium browser with ChatGPT built into every tab, an optional Browser Memories feature and an Agent Mode preview for paid tiers. That was the pitch in OpenAI’s original Atlas announcement, and for Mac users it largely delivered on it.

It never left the Mac. OpenAI announced Windows, iOS and Android versions on day one and none of them shipped. In March 2026 OpenAI said it would merge Atlas, the ChatGPT desktop app and Codex into a single application, and the browser was switched off five months later.

If your copy still opens, treat it as unsupported rather than usable, because it is an unmaintained Chromium build that will not get another security patch. We keep the full record of what ChatGPT Atlas was, including what data was recoverable after the cutoff.

Where Perplexity Comet stands now

Comet is the survivor of this comparison, and it is a much bigger product than it was when Atlas arrived. Perplexity launched Comet on July 9, 2025 for Windows and macOS, originally gated behind its $200 per month Max tier, then opened it up as a free download in October 2025.

Mobile came next. Android arrived on November 20, 2025, and the iPhone version followed on March 18, 2026. An April 2026 update added a proper iPadOS build with multiple windows and better multitasking on iPad. Over the same period, Atlas was still shipping to one operating system.

Pricing is straightforward. The browser costs nothing, and Comet Plus is a $5 per month add-on that puts premium publisher content into Comet’s answers, bundled at no extra cost with Perplexity Pro at $20 per month or Max at $200 per month. Our full Perplexity pricing breakdown has the full tier-by-tier maths.

Comet vs the ChatGPT desktop app

This is the comparison that actually helps you now. OpenAI did not leave the category, it changed the container. The ChatGPT desktop app absorbed the browsing surface, so the real question is whether you want an AI browser or an AI app that browses.

They pull in different directions. Comet is a browser first, so your tabs, extensions, bookmarks and default browser setting all live inside it. The ChatGPT app is an assistant first, and the browser sits inside the conversation, which suits people who start with a task rather than a URL.

Best for research and citations

Comet still wins this outright. It is built on Perplexity’s answer engine, so cited, sourced answers are the default rather than an option, and it reads across multiple open tabs when you ask it to compare things. For students, journalists and anyone who has to show where a claim came from, that is the whole argument.

The ChatGPT app summarises and drafts better, and it is the stronger writing partner. It is simply less insistent about showing you sources, which matters more in coursework than it does in a first draft.

Best for email and scheduling

Comet wins again, for the same reason it did against Atlas. It connects directly to your Google account, so it can check your schedule, find an old message or draft a reply for your approval. Perplexity documents connecting Comet to Gmail and Google Calendar as a first-class feature rather than something the agent improvises.

Be careful here, though, because this is exactly the surface CometJacking targeted. A browser agent with standing access to your inbox is the highest-value target in your entire setup.

The security record of both browsers

Both browsers had a serious flaw disclosed within weeks of launch, and both flaws came from the same root cause. An agent that reads web pages cannot reliably tell your instruction apart from an instruction hidden in the page. That is prompt injection, and it is a category problem rather than a bug one vendor fixed.

Brave’s research on unseeable prompt injections showed how far this goes, with instructions embedded in content the user never sees. Any AI browser you pick, including the ones that replaced Atlas, inherits this.

CometJacking

LayerX disclosed CometJacking in October 2025. A crafted link could push the Comet agent into reading data from connected accounts such as Gmail or Google Calendar and passing it to an attacker, without the user typing anything malicious. LayerX’s CometJacking write-up walks through the payload.

Perplexity shipped fixes after disclosure. The lesson that survives is narrower than the headline, though: the damage scaled with what you had connected, so connect the minimum.

Tainted Memories

Atlas had the mirror-image problem. LayerX’s Tainted Memories research described a cross-site request forgery that wrote hidden instructions into ChatGPT’s memory, which then persisted across sessions and devices and could steer behaviour later on an unrelated site.

OpenAI disputed the finding, said it could not reproduce the attack and reported no real-world exploitation. LayerX stood by its research and the disagreement was never publicly resolved.

How to use an AI browser safely

These rules held for Atlas, hold for Comet, and hold for whatever replaces both.

• Keep it in its own profile. Give the AI browser a separate profile that is not signed into your bank, your work email or your password manager.
• Watch every step. Approve agent actions one at a time and cancel anything you did not ask for.
• Log out for sensitive tasks. An agent that is signed out cannot leak an account it cannot reach.
• Keep money out of it. Let the agent find the product, then close it and pay manually.
• Update immediately. Patch cadence is the whole defence in a category this young, which is also why an abandoned browser like Atlas is unsafe to keep using.

Conclusion

Comet won this comparison by outlasting it. It is free, it runs on every platform you own, and it kept shipping while Atlas stayed on one operating system and was absorbed into the app it was meant to extend.

If you want the closest thing to what Atlas was trying to be, install Comet from Perplexity’s own Comet page and start with a research task rather than an agentic one. If you would rather stay with OpenAI, the ChatGPT desktop app is the official successor. And if you want to compare the wider field first, our best ChatGPT Atlas alternatives for Mac covers multi-model Mac apps alongside both of these.

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