AI Browsers in 2026: Comet, Gemini in Chrome, Copilot, Neon and Dia Compared

An AI browser is a web browser with an assistant built in that can read the pages you have open and, in the newer "agentic" versions, click, type and navigate for you. As of October 2026 the main options are Perplexity's Comet, Gemini in Google Chrome, Copilot in Microsoft Edge, Opera Neon and Dia. They differ less in what they promise than in who gets the agent features, what they cost, and how much of your logged-in browsing they can touch. Before you hand any of them a task, read the section on prompt injection: security researchers have shown that text hidden in a web page can redirect a browser agent, and that risk is the real deciding factor.

Everything below comes from each vendor's own pages, checked on 23 October 2026. Plans and availability in this category change quickly, so treat prices as "as of October 2026" and re-check before you subscribe.

Assistant browser vs agentic browser

Two different things are sold under the same label:

• An assistant in the browser reads and summarises: ask about the open page, compare tabs, summarise a video. It does not act on websites.
• An agentic browser takes actions: it opens pages, fills forms, adds items to a cart or books a reservation while you watch, or while you do something else.

The difference matters because the second kind operates inside your logged-in sessions. That is the same distinction we draw between chatbots and agents in AI agents vs chatbots.

The options at a glance (as of October 2026)

OpenAI's ChatGPT Atlas is the other widely searched name in this category. OpenAI's pages refused our automated checks on 23 October 2026, so we are not describing its features or plans here rather than repeating third-party summaries; check OpenAI's own Atlas page directly.

Perplexity Comet

Perplexity describes Comet as "the AI browser that acts as a personal assistant" and says it is "available for Mac, Windows, iOS, and Android". The page's examples are the agentic kind: comparing news coverage, drafting an email reply that includes your schedule, building a study plan from a syllabus, and shopping for a product within a budget. The same page shows a "Pause Comet Assistant" control — a small but important design choice for anything that acts on your behalf.

Perplexity's getting-started guide covers installation on Windows and Mac and notes that Comet updates itself when relaunched. Neither page stated a price when we checked.

Gemini in Chrome

Google's Chrome AI page lists asking questions across open tabs, summarising pages and YouTube videos, creating Calendar events and saving reusable prompts as "Skills". The agentic feature is auto browse: "Gemini in Chrome can do tasks for you with auto browse", with filling a shopping cart and booking a reservation as examples. Google limits auto browse to Google AI Pro and Ultra subscribers in the U.S., and says Gemini in Chrome is available in "select" countries and languages for people signed in with an eligible account. The page did not state a price for those plans.

Copilot in Edge

Microsoft's Copilot in Edge page describes a sidepane for summarising and comparing, a Copilot new tab page, Journeys (which group related pages and chats and must be switched on), multi-tab reasoning, browsing-history search and optional memory. On cost, it says Edge users "may benefit from a higher free usage allowance", with higher limits through a Microsoft 365 subscription. It also notes that "feature availability and functionality may vary by device type, market, and browser version", and that features can be switched on or off.

Opera Neon

Opera Neon calls itself "a browser built to act". The page describes several agents for different outcomes — browsing, research and document generation among them — and connections to other tools through MCP and CLI. It is the one browser here with a price on the page: $19.90 a month, with a subscription required "to activate agentic functionalities".

Dia

Dia, from The Browser Company of New York, is pitched as "More than a browser. A better workday." Its features are work-focused: a Morning Brief that summarises calendar and inbox, cross-tab answers that draw on tools such as Google Workspace and Teams, a Synthesis feature that turns scattered information into a report, and profiles that separate work and personal logins. It is a free download for macOS and Windows. Dia says browsing data is "never sold or used to build ad profiles" and that Sync is end-to-end encrypted, and it offers toggles for memory, tracker blocking and content sharing.

The risk to understand first: prompt injection

Agentic browsers read web pages and act on what they read. That creates a specific weakness: an attacker can hide instructions in a page, and the agent may follow them as if you had typed them.

This is documented, not hypothetical. In August 2025 Brave's security team published a demonstration against Comet in which instructions hidden in a Reddit comment caused the assistant, when asked to summarise the page, to retrieve the user's email address and a one-time password from their Gmail and post them back. Brave wrote that the assistant fed page content to its model "without distinguishing between the user's instructions and untrusted content from the webpage". Perplexity issued a fix, and Brave's update said the class of attack was not fully mitigated.

In October 2025 Brave published further findings: nearly invisible text inside images could inject instructions through Comet's screenshot feature, and in the Fellou browser simply asking the assistant to visit a page was enough. Brave's conclusion was blunt: "agentic browsing will be inherently dangerous and should be treated as such."

Brave's recommendations translate into practical rules for anyone trying these browsers:

• Keep agent browsing separate from your everyday browsing. Use a separate profile without your bank, email or work accounts signed in when you let an agent loose.
• Trigger the agent only when you mean to. Avoid modes that act automatically on every page.
• Require confirmation for anything that sends, buys or deletes. If a product cannot pause for approval, do not give it that kind of task.
• Treat every web page as untrusted input — including comments, reviews and images.

Our AI agent safety checklist covers the same principles for agents in general, and a password manager plus two-factor authentication limit the damage if a session is ever misused.

When a browser is the wrong tool

If the job is a repeatable task — monitoring a page, compiling a weekly report, researching a list of companies — a hosted agent that runs on its own machine can be a cleaner fit than an agent inside your personal browser. MuleRun, for example, says on its site that "your agent runs on a dedicated computer that stays on 24/7", that it asks for approval before critical actions, and that signup requires no credit card for your first workflows. Running the agent away from your everyday logged-in browser is exactly the isolation Brave recommends. For a wider view of hosted and self-built options, see the best AI agents of 2026, and for how credit-based plans add up, how AI agents are priced.

How to choose

• You want summaries and tab comparisons only: Copilot in Edge, Gemini in Chrome or Dia cover this without agent features switched on.
• You want an agent to act for you: Comet, Opera Neon, or Gemini's auto browse if you are a U.S. Google AI Pro or Ultra subscriber — used in a separate profile.
• Your work lives in Slack, Teams and Google Workspace: Dia is built around that context.
• You need repeatable, scheduled tasks: a hosted agent such as MuleRun, rather than a browser.

Frequently asked questions

What is an agentic browser?

A browser with a built-in AI agent that can take actions on websites — open pages, fill forms, add items to a cart — rather than only summarising what you are reading.

Which AI browsers are free?

As of October 2026, Dia is a free download, Copilot in Edge has a free usage allowance with higher limits through Microsoft 365, and Opera Neon's agent features require a $19.90 monthly subscription. Comet's and Google's pages did not state a price when we checked.

Can Gemini in Chrome do tasks for me?

Yes, through auto browse, which Google limits to Google AI Pro and Ultra subscribers in the U.S. Its examples include filling a shopping cart and booking a reservation.

Are AI browsers safe?

They carry a specific risk: prompt injection, where hidden text in a page redirects the agent. Brave demonstrated working attacks against Comet in 2025. Use a separate browser profile without sensitive accounts, and require confirmation before the agent sends, buys or deletes anything.

Is an AI browser the same as an AI agent?

An AI browser is one place an agent can live. Hosted agents run on their own machines and can work on schedules without your browser open; see AI agents vs chatbots for the broader definitions.

Sources checked 23 October 2026: perplexity.ai/comet; Perplexity Help Center, "Getting Started with Comet"; google.com/chrome/ai-innovations; explore.microsoft.com (Copilot in Edge); operaneon.com; diabrowser.com; brave.com (two security research posts); mulerun.com. Editorial content.