AI browsers in late 2026: Comet is free, ChatGPT Atlas shut down, Dia dropped its paid plan and Arc is frozen. What to install on Mac or Windows, and the risks.
Every product in this category changed in the last twelve months, and several changed in ways that make older roundups wrong.
Perplexity's Comet went from a perk of its $200-a-month Max plan to free for everyone in October 2025. The Browser Company froze Arc to build Dia, sold itself to Atlassian for $610 million, and then retired Dia's $20 Pro plan at the end of May 2026. And OpenAI, after launching its own browser, ChatGPT Atlas, in October 2025, shut it down on August 9, 2026 and moved the browsing agent into the ChatGPT desktop app. The standalone AI browser is turning out to be a harder business than it looked a year ago.
How we researched this: vendors' own pages, help centers and release notes checked in September 2026, plus independent reporting. We have not used every browser here as a daily driver, and performance notes reflect consistent findings across reviewers.
Comet is the one to try first. It is free on Windows, Mac, iPhone and Android, Perplexity's cited search sits in every tab, and with Perplexity Pro its agent can browse and complete multi-step tasks across sites. The recurring criticism is confusion when it juggles too many tabs.
Dia is The Browser Company's AI browser for work, now owned by Atlassian. Its assistant reads your tabs and connected apps such as Gmail, Slack, Notion, GitHub and Microsoft tools, writes a morning brief, and prepares meeting pages. It is free after the Pro plan was retired and Mac-only until the Windows version due this fall.
Brave with its Leo assistant is the privacy option: free, with no account and no chat logs, and every model, including Anthropic's, hosted on Brave's own servers. A $14.99-a-month Premium tier adds larger models such as Claude Sonnet and Opus. Leo can also connect to your own local or remote models, and an experimental agent is being tested in Brave's Nightly build.
Opera One, GX and Air, the company's main browsers, include free AI features. Its agentic browser, Opera Neon, became a free download in August 2026, but the agents that browse, prepare deep research and generate documents need a $19.90-a-month subscription.
Chrome with Gemini and Edge with Microsoft Copilot are the incumbents' answer: AI added to the browsers most people already use, tied to Google and Microsoft accounts.
Arc still works and still downloads, but it gets only Chromium updates and occasional security fixes, and no new features. Nobody should start there.
ChatGPT Atlas no longer exists. Its replacement is not a browser you switch to but a browser inside the ChatGPT desktop app for Mac and Windows, which also runs Chat, Work and Codex.
For much of 2026, Windows users were shut out of the most talked-about AI browsers. Atlas never left the Mac, and Dia still has not, with its Windows version promised for this fall. The cross-platform choices are Comet, Brave, Opera, and the AI built into Edge and Chrome.
The ChatGPT desktop app changes that a little: its built-in browser and agent run on Windows as well as macOS. It is not a replacement for your everyday browser, but it gives Windows users OpenAI's browsing agent without waiting for a new product.
This is the part worth taking seriously. An agent that acts on your logged-in sessions can be hijacked by a malicious page through prompt injection: a page tells the agent to do something you did not ask for, and the agent, already signed in as you, does it. OpenAI has itself said the problem is unlikely ever to be fully solved, which should shape how you use these tools rather than whether you use them.
Vendors are responding with isolation. Brave runs its experimental agent in a separate browser profile and checks that actions match your intent, and Dia offers companies controls to switch AI off on specific websites. The practical guidance holds for all of them: use agents for research and low-stakes tasks, keep them in a separate profile, and keep banking, email and password managers out of reach.
Agents also raise a legal question. Amazon sued Perplexity in November 2025 over Comet's automated shopping on its store, and a judge later blocked Comet's agent from shopping on Amazon. However the case ends, an agent buying things on your behalf is contested ground.
| Your situation | What to install | Why |
|---|---|---|
| You want to try an AI browser for free | Comet | Windows and Mac, a capable agent, answers with sources |
| Your workday runs through Gmail, Slack and Notion on a Mac | Dia | Built around those apps, and free since May |
| Privacy matters more than capability | Brave with Leo | No account, no logs, local models supported |
| You already pay for ChatGPT | The ChatGPT desktop app | Its built-in browser and agent replaced Atlas |
| You are happy with Chrome or Edge | Nothing new | Gemini and Copilot cover summaries and page questions |
| You still use Arc | Dia, or Zen for Arc's design | Arc gets no new features |
The interesting question is less which AI browser wins than whether the standalone AI browser survives as a category. OpenAI's decision to fold Atlas into ChatGPT, Dia's retreat from a paid plan, and Google and Microsoft building assistants into Chrome and Edge all point the same way: the AI layer becomes something inside the browser or assistant you already use, rather than a reason to switch.
If that is right, the winners are the incumbents with distribution, and standalone products prove out ideas that get absorbed. Comet's move to free looks like a bet on staying relevant in that world. Perplexity and The Browser Company are the ones to watch.
For most people, Perplexity's Comet: it is free on Windows, Mac, iPhone and Android, keeps an assistant beside every tab, grounds answers in cited search and adds an agent for Perplexity Pro subscribers. Mac users who live in work apps should try Dia, privacy-minded users Brave with its Leo assistant, and anyone content with their current browser can use the AI built into Chrome or Edge.
No. OpenAI shut down ChatGPT Atlas on August 9, 2026, about nine months after launching it for Macs, and moved its browsing agent into ChatGPT. The ChatGPT desktop app for Mac and Windows, released on July 9, 2026, includes a built-in browser alongside Chat, Work and Codex.
Comet, Brave, Opera, Microsoft Edge with Copilot and Google Chrome with Gemini all run on Windows. Dia is Mac-only until its Windows version, promised for fall 2026, and Arc for Windows still installs but no longer gets new features. ChatGPT's desktop app also brings its browsing agent to Windows.
Use them with care. An agent acting on your logged-in accounts can be manipulated by instructions hidden in a web page, a technique called prompt injection, and no vendor claims to have solved it completely. Keep agents to research and low-stakes tasks, use a separate browser profile, and keep banking, email and password managers out of their reach.
Several. Comet is free for everyone, Dia is free since it retired its paid plan in May 2026, Brave's Leo assistant is free without an account, and Opera's main browsers include free AI features. Opera Neon is free to download but charges $19.90 a month for its AI agents.
No spam. Unsubscribe anytime.