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Comparing the Top 4 Agentic AI Browsers in 2025: Atlas vs Copilot Mode vs Dia vs Comet

ByRicardo

Agentic AI browsers are shifting the mannequin from ‘answering about the internet’ to working on the internet. In 2025, 4 AI browsers outline this area: OpenAI’s ChatGPT Atlas, Microsoft Edge with Copilot Mode, The Browser Company’s Dia, and Perplexity’s Comet. Each makes completely different design selections round autonomy, reminiscence, and privateness. This article compares their architectures, capabilities, and threat profiles so varied sort of customers can resolve which browser aligns with their workflows.

What are Agentic Browsers?

Agentic browsers will not be simply ‘chat over a web page’. They expose the browser’s DOM (Document Object Model), tab graph, and historical past to an AI mannequin and permit it to:

  • Read and purpose over a number of tabs
  • Maintain process context throughout time
  • Take actions akin to navigating, filling varieties, and finishing workflows

OpenAI ChatGPT Atlas, Microsoft Edge Copilot Mode, The Browser Company’s Dia, and Perplexity’s Comet all do that, however with completely different tradeoffs in autonomy, reminiscence, and safety.

High-level comparability

  • Atlas is the most absolutely agentic: deep ChatGPT integration, wealthy browser management, robust however advanced reminiscence and privateness story.
  • Copilot Mode is an incremental however important extension to Edge: unified Copilot, cross-tab reasoning, early ‘Actions’ for automation, nonetheless conservative in contrast with Atlas and Comet.
  • Dia is an AI-first browser constructed on Chromium, optimized for studying, writing, and structured workflows with privacy-first defaults and deliberately restricted autonomy.
  • Comet is a extremely agentic private assistant browser with deep workflow automation, a local-data narrative, and at present the most aggressive authorized and safety threat profile.

The remainder of the article unpacks these variations in a extra technical method.

1. ChatGPT Atlas (OpenAI): AI-native browser with full agent mode

1.1 Architecture

Atlas is a devoted AI browser constructed round ChatGPT fairly than a typical Chromium shell with an extension. It runs on Chromium however wraps it in OpenAI’s OWL course of structure, which separates the rendering engine from the Atlas software and agent layer.

Key traits:

  • macOS solely at launch, with Windows, iOS, and Android ‘coming quickly’.
  • ChatGPT is uncovered in every single place: omnibox, predominant panel, and a ChatGPT sidebar that may see the present web page and tabs.

This offers Atlas a first-class API into:

  • Current tab DOM and visual content material
  • Tab listing and navigation historical past
  • User queries and former dialog state

1.2 Agent mode: actual browser management

Agent Mode is the key differentiator. For Plus / Pro / Business customers, Atlas can execute multi-step workflows:

  • Open and shut tabs, comply with hyperlinks, and change websites
  • Fill out varieties and on-line functions
  • Book reservations akin to accommodations and eating places
  • Compare merchandise throughout a number of websites and return structured summaries

Constraints:

  • Agent mode can not entry native recordsdata or the OS, and can’t obtain or execute native packages. It is sandboxed inside the browser.
  • Actions require express person consent; Atlas surfaces prompts like ‘Should I begin clicking and filling these varieties’ earlier than executing workflows.

1.3 Memory and privateness

Atlas introduces browser recollections:

  • It shops filtered summaries of visited pages and inferred person intent, not full web page captures. Summaries are retained for about 30 days, enabling queries like ‘reopen the studies I learn yesterday’ or ‘proceed the Athens itinerary plan’.
  • Memories are opt-in and might be seen, edited, or deleted. Memory might be disabled globally or on particular websites, and Atlas helps incognito.

OpenAI additionally added parental controls that permit guardians disable each browser recollections and agent mode for baby accounts.

Critical factors:

1.4 Pricing and match

  • Atlas is free to put in for ChatGPT customers on macOS.
  • Agent Mode is just out there on paid ChatGPT tiers (Plus, Pro, Business, Enterprise).

Fit:

  • Best for customers who need most in-browser automation and are snug with cloud-centric knowledge dealing with and a still-evolving safety posture.

2. Copilot Mode in Microsoft Edge: tab-reasoning with managed autonomy

2.1 Architecture

Copilot Mode is Microsoft’s AI layer inside Edge, not a separate browser. It exposes:

  • A unified Copilot field on new tabs for chat, search, and navigation
  • Deep integration with Edge context (open tabs, historical past, and a few browser settings) when customers choose in.

Microsoft additionally ties Copilot Mode into:

  • Journeys: topic-centric clusters over searching historical past, which Copilot can summarize and re-open.
  • Copilot Actions: an early agentic layer able to actions like clearing cache, unsubscribing from mailing lists, and reserving reservations in preview.

2.2 Agentic habits

Compared with Atlas:

  • Copilot Mode can purpose throughout a number of tabs, summarize and examine them, and help with structured duties like journey planning or multi-site analysis.
  • Actions Preview extends this into partially agentic flows, akin to reserving a restaurant or filling varieties, however present evaluations present inconsistent reliability and occasional ‘hallucinated’ completions of duties that weren’t efficiently executed.

Crucially, Copilot Mode stays extra constrained than Atlas or Comet:

  • It doesn’t expose an overtly programmable DOM-level agent with free cursor management
  • Action templates are narrower and guarded, notably for e mail and account-sensitive operations

2.3 Data, privateness, and enterprise posture

Edge with Copilot Mode is clearly aimed toward enterprise adoption:

  • Copilot entry to tab and historical past knowledge is explicitly permissioned; customers can disable history-based personalization, Copilot context, and Copilot Mode solely.
  • Microsoft integrates Prompt Shields and Azure AI security layers to mitigate immediate injection and jailbreak makes an attempt.

Fit:

  • Appropriate the place organizations need AI-assisted searching and cross-tab reasoning whereas preserving automation scoped and extra auditable than a completely agentic browser.

3. Dia (The Browser Company): AI-first, Chromium-based, privacy-forward

3.1 Architecture and UX

Dia is The Browser Company’s AI-centric successor to Arc, constructed on Chromium and at present out there on macOS solely.

Core design selections:

  • The canonical interplay is ‘chat along with your tabs‘: Dia’s assistant can learn open tabs, referenced tabs, and choices, and reply questions or rework content material in place.
  • Dia features a Skills system, the place customers outline reusable immediate ‘scripts’ and workflows for duties like note-taking or analysis templates.

Dia’s UX is optimized for:

  • Reading and understanding long-form content material
  • Writing and modifying in-page
  • Learning workflows (tutoring, flashcards, argument comparability)

3.2 Memory and ‘local-first’ privateness

Dia’s predominant differentiation is its privateness posture:

  • Browsing historical past, chats, bookmarks, and saved content material are saved domestically and encrypted, with knowledge despatched to servers solely when required to reply a selected question.
  • The Memory function shops summaries and realized preferences, however customers can disable reminiscence solely in settings or management what contexts are shared.

The internet impact is an AI browser that tries to behave extra like an area data layer with scoped cloud calls fairly than a steady telemetry stream.

3.3 Agentic scope and constraints

Dia is deliberately much less agentic than Atlas or Comet:

  • The assistant can learn and summarize pages, rework textual content, generate content material, and run Skills over the present tab set.
  • Current public builds don’t expose a normal DOM automation agent able to open-ended clicking and type submission throughout arbitrary websites.

In apply, Dia behaves as a high-context copilot fairly than a completely autonomous internet operator. This is aligned with the firm’s positioning and with Atlassian’s acknowledged intent after buying The Browser Company, which emphasizes particular person data employee workflows over transactional automation.

3.4 Pricing and availability

  • Dia now ships to all Mac customers, no invite required, as of October 2025.
  • Free tier: Core AI chat, Skills, and Memory, with utilization limits.
  • Dia Pro at $20/month unlocks successfully limitless AI chat utilization inside phrases of use.

Fit:

  • Strong for academic and writing-heavy workflows, for customers who need AI-augmented searching with out handing an agent broad management over the internet session.

4. Comet (Perplexity): extremely agentic assistant browser with heavy threat floor

4.1 Architecture and capabilities

Comet is Perplexity’s AI browser constructed on Chromium, positioned as a private AI assistant and ‘considering associate‘ fairly than a easy search UI.

The Comet Assistant can:

  • Summarize and discover any web page
  • Execute multi-step workflows for analysis, coding, assembly prep, and e-commerce
  • Manage e mail and calendar through built-in connectors
  • Handle advanced duties like evaluating merchandise, studying opinions, and shifting all the technique to checkout.

Recent updates prolong the agent to work longer and throughout bigger jobs, emphasizing persistent, agentic habits over many tabs and time durations.

4.2 Data mannequin and privateness claims

Perplexity’s Comet Privacy Notice and product pages declare:

  • Browsing knowledge, cookies, and saved credentials are saved domestically on the gadget by default.
  • Users can delete searching knowledge and saved credentials from Comet settings, and handle cookie habits.
  • Integration with 1Password retains vaults end-to-end encrypted and opaque to Perplexity.

So the official structure is a hybrid: native browser state with selective context uploads to Comet’s servers and Perplexity’s search fashions.

However, a number of impartial opinions argue that regardless of these controls, the mixture of: Deep integration with third-party providers (Gmail, calendar, monetary accounts) and excessive agent autonomy over these providers produces a big efficient privateness threat envelope, particularly for company knowledge.

Comet at present has the most seen safety and authorized points amongst the 4:

  • Indirect prompt-injection / ‘CometJacking‘: LayerX and different researchers confirmed that malicious URLs and embedded prompts might hijack Comet’s assistant, exfiltrating knowledge from linked providers and even performing fraudulent actions.
  • Although Perplexity has patched particular vulnerabilities, safety audits from Brave, Guardio, and others nonetheless suggest excessive warning for delicate workloads.
  • Amazon lawsuit: (*4*)r, alleging that automated purchasing classes accessed buyer accounts and impersonated human searching, violating platform guidelines and harming personalization programs.

4.4 Pricing and availability

  • As of October–November 2025, Comet is free to obtain globally; earlier Max-only and Pro-only restrictions have been eliminated.
  • Perplexity monetizes through Pro / Max subscriptions for greater mannequin tiers and through Comet Plus (~$5 / month), which grants entry to curated information and writer content material and is bundled into Pro / Max.

Fit:

  • Very robust for customers who need most automation throughout analysis, communications, and purchases, and who’re snug working at the bleeding fringe of the safety and platform-policy threat curve.

Comparison Table

Dimension ChatGPT Atlas (OpenAI) Edge + Copilot Mode (Microsoft) Dia (The Browser Company) Comet (Perplexity)
Engine / platform Chromium-based; Atlas shell with OWL structure; macOS now, Windows / cellular deliberate Edge (Chromium) on Windows and macOS with optionally available Copilot Mode Chromium-based AI browser; macOS solely, GA, no invite; Windows not but introduced Chromium-based browser with built-in Perplexity search and assistant; desktop international, cellular rolling out
Agentic autonomy High: Agent Mode can click on, navigate, fill varieties, e book reservations, and chain multi-step workflows inside the browser Medium: cross-tab reasoning and Actions; can carry out some transactional steps however with restricted scope and reliability Low–medium: chat, Skills, and reminiscence over tabs; no normal agent that freely manipulates arbitrary websites; autonomy deliberately constrained High: Comet Assistant executes long-running workflows throughout searching, e mail, calendar, and e-commerce, together with end-to-end purchasing and planning flows
Memory / personalization Browser recollections retain summarized context for ~30 days; persistent process context throughout classes, opt-in and user-controllable Journeys over historical past, context sharing for Copilot is opt-in; personalization tied to Microsoft account and privateness controls Local encrypted storage of historical past, chats, bookmarks; Dia Memory for personalization with capacity to restrict shared context Local-first searching knowledge plus cloud-side fashions; settings permit deleting native knowledge and tuning assortment
Best-fit use circumstances Complex analysis, automation-heavy workflows, and agent experiments the place robust autonomy outweighs threat Everyday searching with AI summaries and analysis help in Microsoft-centric environments Learning, writing, and planning the place privateness and structured Skills are extra necessary than full automation Power customers who desire a private operator for searching, communication, and purchasing, and who will actively handle safety and coverage threat

Which browser to decide on in 2025?

  • Pick Atlas while you need to discover the frontier of in-browser brokers. It provides the richest motion floor and reminiscence mannequin, at the price of higher complexity in security and compliance design.
  • Pick Edge + Copilot Mode while you want incremental AI help in a browser that already matches Microsoft-centric enterprise governance, and you favor scoped brokers over unconstrained ones.
  • Pick Dia when your major workload is studying, studying, and writing, and also you need robust local-first ensures and express management over what info the mannequin sees, with minimal automation.
  • Pick Comet provided that you explicitly desire a high-autonomy private operator in your browser and are prepared to trace safety advisories and platform insurance policies carefully.

References:

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