Best AI Browsers in 2026: Comet, Atlas, Copilot Mode Compared

Open a browser today and there’s a decent chance it wants to do more than load pages. It wants to summarize the page, fill out the form, or finish the multi-step errand you’ve been putting off. That’s the pitch behind every AI browser released or updated since late 2025: Perplexity’s Comet, OpenAI’s ChatGPT Atlas, Opera Neon, Microsoft Edge’s Copilot Mode, Google’s Gemini-powered Chrome, Brave Leo, and a handful of others.

Some of these are full replacement browsers. Others are AI layered onto browsers you already use. A few are free, one charges nearly $20 a month for its most capable mode, and at least one launched with enough fanfare a year ago that its current status is now genuinely unclear. This guide sorts out what each one actually does, what its own maker says about safety, and where an AI browser still leaves your tabs exactly as unprotected as any other browser did.

What Is an AI Browser?

An AI browser is a regular web browser with a built-in chat assistant, an autonomous “agent” that can act on pages for you, or both.

Under the hood, almost none of them are new browser engines. Chrome, Edge, Comet, Atlas, Opera (including Opera Neon), and Dia are all built on Chromium’s Blink engine; Brave is Chromium-based too. Firefox keeps its own Gecko engine and instead lets you plug in an outside AI chatbot. Safari, notably, ships no built-in AI assistant on its official features page as of this writing.

Every one of these browsers, AI-branded or not, still runs on the same foundation: a rendering engine, and the browser object model that lets JavaScript read and change tabs, windows, history, and the page itself. An AI browser’s agent mode uses that same browser object model to click buttons, fill fields, and read what’s on screen. It’s automating the browser, not replacing it. That’s worth knowing, because it means the AI layer inherits whatever access a script running in your browser normally has, which is also where the security caveats later in this guide come from.

The two flavors you’ll see marketed are chat and agent. Chat features (Brave Leo, Firefox’s AI sidebar, Comet’s assistant) summarize pages, answer questions about what’s open, or draft text. Agent features (Gemini’s Auto Browse in Chrome, Edge’s Copilot Actions, parts of Comet and Dia) go further and complete multi-step tasks themselves — booking something, filling out a form, managing a subscription. Vendors are careful to build in checkpoints before agents take consequential actions, which we’ll cover browser by browser below. Not sure which browser you’re on right now? Check what browser you’re using before you compare it against the list ahead.

Quick Answer: Which AI Browser Fits You Best?

If you just want free AI chat alongside normal browsing, Perplexity Comet or Brave Leo cover it without a subscription; if you want an agent that finishes tasks, Edge’s Copilot Mode or Chrome’s Gemini Auto Browse are the free previews to try first.

Here’s the short version, situation by situation:

Notice ChatGPT Atlas isn’t in that table. It launched on macOS in October 2025 with Windows, iOS, and Android listed as “coming soon,” but there’s no way to confirm its current availability without checking OpenAI’s site directly, so it gets its own section below instead of a recommendation here. If you want a broader look at browsers generally, not just the AI layer, our best browser comparison covers Chrome, Edge, Firefox, Safari, and more side by side.

Perplexity Comet: What’s Actually Free

Perplexity Comet has been free for everyone worldwide since October 2, 2025, reversing its original $200-a-month exclusive positioning.

Comet is Chromium-based, made by Perplexity AI, and per Perplexity’s own announcement, the company says the free base browser “will always be free.” What isn’t free are two optional layers stacked on top: Comet Plus, a $5-a-month subscription for premium publisher content, and Perplexity Pro at $20 a month, which unlocks Comet Plus along with Perplexity’s broader AI subscription. You can use Comet itself, including its AI browsing assistant, without paying for either.

On platforms, Perplexity’s Help Center publishes separate enterprise install guides for both macOS and Windows, so desktop support on both operating systems is confirmed directly from the source. A mobile build also exists, referenced in Perplexity’s own changelog entry titled “Comet iOS Launch and Computer Updates.” What isn’t confirmed is an exact general-release date for Android or iOS outside that enterprise and changelog mention, so treat “it’s on my phone already” as something to check yourself rather than assume.

Because Comet runs on Chromium, it should feel familiar if you’re coming from Chrome, Edge, Brave, or Opera: tabs, extensions in the same general shape, a URL bar that behaves the way you expect. The difference is the AI layer sitting in a sidebar or panel, ready to summarize a page, answer a question about your open tabs, or take actions across a session in Comet’s more capable modes. BelayTab doesn’t currently list Comet among its supported browsers, so if you’re moving from Chrome to Comet, don’t assume your saved sessions carry over automatically. Export what you need first using BelayTab’s import and export options, which cover plain URL lists alongside JSON, CSV, and HTML bookmarks.

ChatGPT Atlas: Where OpenAI’s Browser Stands Now

OpenAI launched ChatGPT Atlas on October 21, 2025, as a Chromium-based desktop browser with ChatGPT built into a sidebar, but as of September 2026 its current availability isn’t something we can confirm from an official source.

At launch, per OpenAI’s original announcement, Atlas shipped on macOS first, with Windows, iOS, and Android listed as “coming soon.” That’s the last officially documented state of the rollout. There have been reports that OpenAI folded Atlas into the main ChatGPT app around August 2026, but no official OpenAI page could be loaded to confirm or deny that this session, so we’re not going to call it discontinued, and we’re not going to call it currently available either.

Atlas’s status is unclear. OpenAI launched ChatGPT Atlas in October 2025. Reports say it was folded into the main ChatGPT app around August 2026, but no official OpenAI page confirms this. Check openai.com for Atlas’s current availability before you rely on it.

What we can tell you is what OpenAI said about it at launch: a Chromium-based browser built to bring conversational AI directly into your everyday browsing instead of keeping it in a separate tab. If that’s the kind of thing you’re after, the honest advice is to check openai.com directly before you plan around it — a browser that might not be actively developed is a worse bet than one that clearly is.

This is also a good moment to mention something that applies to every browser in this guide, AI or not: whatever you’re using six months from now, your tabs are the part that’s genuinely yours. Browser companies pivot, sunset products, and fold features into other apps regularly — Atlas’s uncertain status and Arc’s maintenance mode, covered next, are two examples from the same twelve months. A saved session outlives the app that made it.

Dia and the End of Arc: What Actually Changed

Arc, the browser many people loved for its sidebar and Spaces, is now in maintenance mode: its own site says it “receives Chromium updates only,” and directs anyone who wants active security patches to download Dia instead.

The reason traces back to a corporate deal. Atlassian completed its acquisition of The Browser Company, the maker of both Arc and Dia, on October 21, 2025, in a $610 million all-cash deal. Atlassian’s own announcement frames Dia, not Arc, as the focus going forward, built for “workflows, rather than just browsing.”

Dia is publicly downloadable now, not waitlist-gated, and offers a 14-day free trial of something it calls “Better Days.” Per Arc’s own site, Dia gets active weekly security updates and SOC 2 certification as Arc’s designated successor. Its AI features, per Dia’s own homepage, include a Morning Brief that summarizes your calendar, inbox, and key links; a cross-tool “Synthesis” or context search that pulls from your full browsing context; and a deck generator that turns whatever it gathered into slides. It also integrates with workplace tools: Slack, Notion, Microsoft Teams, GSuite, and GitHub. Dia’s exact supported operating systems aren’t itemized on its own site, so don’t assume it’s everywhere Arc was.

If you’re still on Arc and weighing whether to move, the good news is BelayTab already supports Arc directly, alongside Chrome, Edge, Brave, Opera, Vivaldi, Firefox, and Safari on Mac, so at minimum saving your current sessions before you decide anything is quick and doesn’t lock you into either browser. We’ve written a full breakdown of Arc’s status and how to move your tabs elsewhere if you want the longer version, including what “maintenance mode” means for day-to-day use.

Opera Neon: Free Browser, Paid Agent Layer

Opera Neon is a downloadable browser with its essentials free and its agentic AI features gated behind a $19.90-a-month “Standard” subscription.

According to Opera Neon’s own site, that Standard tier is what “activate[s] agentic functionalities and top world LLMs” — the part of Neon that can act on tasks rather than just chat about them. Everything else that ships with Neon is described as already included outside the paid tier: tab management, snapshots, a sidebar with messengers and other services, ad blocking, and a built-in VPN.

That’s a meaningfully different pricing shape than most of the browsers in this guide. Comet, Brave Leo, and Firefox’s AI sidebar are free with optional paid upgrades for extra capability or content. Neon flips that: the browser is free, but its headline AI feature is a subscription from day one. If you’re mainly curious about agentic browsing and don’t want to commit $20 a month before you’ve tried it, Comet or the free previews in Edge and Chrome, covered below, are the lower-commitment way to get a feel for what an agent-driven browser is like.

Opera Neon’s exact supported operating systems aren’t itemized on its official page, so we can’t tell you definitively whether it’s on Linux or mobile as of this writing. Note also that Neon is a separate download from the standard Opera browser that most people already know — BelayTab supports that standard Opera browser, but Opera Neon is a distinct product and isn’t part of that supported list. If you’re an existing Opera user experimenting with Neon, keep your regular Opera sessions backed up separately rather than assuming continuity between the two.

Microsoft Edge Copilot Mode: Actions and Journeys

Copilot Mode in Edge is a free, limited-preview feature available on Windows and Mac that adds two main capabilities: Copilot Actions and Journeys.

Per Microsoft’s Edge developer blog, Copilot Actions handles natural-language commands to complete tasks — the examples Microsoft gives are unsubscribing from a newsletter or booking a reservation. Journeys is more passive: it auto-groups your past browsing into resumable projects, so if you were deep in flight research three days ago, Edge can surface that as one resumable thread instead of forty scattered history entries. A mobile app version of Copilot Mode is listed as “coming soon” rather than shipping yet.

Microsoft is unusually direct about the guardrails. The same official blog post states “your data stays yours,” that data is “never shared without your permission,” and that Edge shows “clear visual cues” when Copilot is “taking an action, listening or viewing.” That last part matters if an agent is going to be clicking around inside a browser window that might have your email, your banking tab, or a half-finished form open. You want to know at a glance whether it’s doing something right now.

Edge itself is Chromium-based and on BelayTab’s supported list, so turning on Copilot Mode doesn’t change anything about how BelayTab saves and restores your Edge windows and tab groups; that keeps working the same way underneath.

Google Chrome’s Gemini and Auto Browse

Gemini in Chrome adds an AI assistant to the browser, and its most agentic feature, Auto Browse, can handle multi-step chores like planning a trip or filling out a form on your behalf.

Google describes Auto Browse’s task range as planning trips, completing forms, scheduling appointments, managing subscriptions, and adding visually matched items to a shopping cart. As of Google’s announcement, Auto Browse itself is a preview rolling out in the U.S. only, and it requires a Google AI Pro or Google AI Ultra subscription; it isn’t part of the free Gemini-in-Chrome experience. The broader Gemini-in-Chrome features, separate from Auto Browse specifically, are listed as available on Windows, macOS, and Chromebook Plus devices in the U.S.

On safety, Google is explicit in the same Chrome blog post: Auto Browse “is designed to pause and explicitly ask for your confirmation” before consequential actions like making a purchase or posting on social media. Google also states it has “trained its models to detect common AI threats such as prompt injection, where malicious instructions hidden on a webpage attempt to manipulate an AI agent.” That’s the most direct acknowledgment of prompt injection risk from any vendor covered in this guide.

Chrome remains the browser most people already use daily, and it’s fully supported by BelayTab — sessions, tab groups, and pinned tabs all save and restore normally whether or not Gemini features are switched on.

Brave Leo and Firefox’s AI Sidebar: The Lower-Key Options

Brave Leo and Firefox’s AI sidebar both skip the agent-does-tasks-for-you approach and stick to chat, with Brave building in its own assistant and Firefox letting you pick from outside providers.

Brave Software brands its product simply as the Brave browser, though people also search for it as web browser Brave, internet browser Brave, or Brave software browser. It’s completely free to use, built off the open-source Chromium core, and available on Windows, macOS, and Linux desktop plus Android and iOS. Leo, its AI assistant, is available across all of those platforms and is free, with an optional premium tier Brave describes as unlocking “access to more models and even faster responses.”

Brave’s own privacy claims for Leo are specific: it states Leo “doesn’t retain or share chats, or use them for additional model training,” that “no account or login is required,” and that Brave does “not collect identifiers that can be linked to you (such as IP Address).” If you’ve read our Brave vs. Chrome comparison, that same privacy-first posture extends into how Leo is built.

Firefox takes a different approach entirely: instead of one branded assistant, Mozilla’s support page lists Anthropic Claude, ChatGPT, Google Gemini, Le Chat Mistral, and, from Firefox 143 onward, Microsoft Copilot as sidebar options, each with a free tier. The sidebar can summarize the open page or a text selection, but doing so sends that content, plus the page title, to whichever provider you picked — worth knowing before you summarize something sensitive. Both Brave and Firefox are on BelayTab’s supported browser list, so your saved sessions work the same in either one, AI features on or off.

Are AI Browsers Safe? What Prompt Injection Means for You

AI browsers are only as safe as their guardrails against prompt injection — attacks where instructions hidden on a webpage try to hijack an agent that’s reading that page on your behalf — and vendor transparency about this varies quite a bit.

Google is the most explicit about this by name: its Auto Browse announcement states outright that it has trained its models to detect “common AI threats such as prompt injection.” Microsoft doesn’t use the term “prompt injection” in its Copilot Mode post, but addresses the same concern indirectly through visual cues whenever Copilot is acting, listening, or viewing, plus a confirmation step before it does anything consequential. Brave’s approach is different again: Leo simply doesn’t retain chats or use them for training, which limits what could go wrong even if something did slip through.

None of this means agentic browsing is unsafe to try. It means the honest read is that these are new features from companies that are, by their own admission, actively defending against a known attack pattern rather than one nobody has thought about. Here’s a short summary of what each vendor states in its own words, so you can compare their claims rather than take anyone’s marketing at face value.

Confirmation prompts exist for a reason. When an agentic feature asks you to confirm a purchase, a post, or a form submission, read what it’s about to do. Google and Microsoft both build these pauses in deliberately — skipping past them defeats the point.

Do You Still Need a Tab Manager With an AI Browser?

Yes. None of the AI browsers in this guide back up, version, or recover your tabs the way a dedicated tool does, because that isn’t the job they’re built for.

An AI browser is trying to solve a different problem: helping you do more with the page in front of you, or handing off a task entirely. It isn’t tracking what happens if the browser itself crashes, if you close a window by accident, or if you switch from Chrome to a new AI browser and want your forty research tabs to come with you. Those are tab-management problems, and they exist in AI browsers exactly as much as they exist in ordinary ones.

BelayTab handles that layer directly, for free, with no account required. It saves an open window, or selected tabs, a single tab, or all windows, as a named session with one click or Ctrl/Cmd+Shift+S, automatically snapshots each open window every five minutes and whenever a window closes, keeps the last 20 versions of each session, and gives you one Recovery screen that pulls together snapshots, deleted sessions, your browser’s own recently closed windows, and any export files. None of that requires you to trust an AI agent with anything; it just makes sure the tabs survive whatever happens next, crash, browser switch, or otherwise.

See the full list of browsers BelayTab supports — here’s where the everyday Chromium and Firefox browsers stand today:

• Chrome. Sessions, tab groups, and pinned tabs restore exactly as you left them.
• Edge. Works the same whether or not Copilot Mode is switched on.
• Brave. Shields and privacy settings aren’t affected by saving or restoring sessions.
• Opera. The standard Opera browser, not Opera Neon specifically.
• Vivaldi. Tab stacks and workspaces are preserved on restore.
• Arc. A useful safety net if you’re weighing a move to Dia.

If you do decide to switch your default browser after trying one of the options above, here’s the official path on Windows 11:

Whichever AI browser you end up trying, Chrome, Edge, and Brave are also worth a broader look on their own if the AI layer isn’t the deciding factor; see our full browser comparison for that side of the decision.