Skip to main content

Grok vs Comet

A feature-by-feature comparison of Grok and Comet across 7 capability categories.

First tool

Try Grok (opens in a new tab)

Second tool

Try Comet (opens in a new tab)

Modalities — Tie

Modalities: Grok compared with Comet
Feature	Grok	Comet
Text Input	Yes. Core feature	Yes, requires free plan. The sidecar assistant takes natural-language prompts for search, summaries, and page tasks.
Image Upload / Vision	Yes	Unknown. Vision on the current page is plausible for an in-browser agent, but Comet help does not spell out image attach.
Image Generation	Yes	Unknown. Image models exist on Perplexity web for some plans; not documented as a Comet browser feature.
Voice Mode	No	Unknown. Launch copy mentioned voice on mobile; the current Comet product page does not document a voice loop.
Video Understanding	No	Unknown. Perplexity can transcribe attached video on the web app; Comet-specific video understanding is not documented.
Video Generation	No. Not a video generation product.	No. Not a video generation product.
File Upload (PDF, DOCX)	No	Unknown. File attach is documented for Perplexity search, not as a Comet browser control.
Code Execution	No	Unknown. The marketing site shows the assistant building a webpage in the browser; that is not a documented code sandbox.
Audio Input	No	Unknown. Audio-file input is not described in Comet setup or privacy help.
Canvas / Artifact Editor	No	Yes, requires free plan. The assistant sits in a sidecar beside the page you are browsing.
Screen Sharing / Computer Use	No	Yes, requires free plan. The assistant is documented acting on the live page (forms, shopping, posting) rather than only summarizing.

Memory & Context — Grok Wins

Memory & Context: Grok compared with Comet
Feature	Grok	Comet
Persistent Memory	No	Unknown. Max “Brain” memory is documented for Perplexity Computer, not as a Comet default.
Large Context Window	Partial. Standard context	Unknown. No token window is published for the Comet assistant.
Custom Instructions	No	Unknown. A global assistant-instruction setting was not found in Comet help.
Conversation History	Yes	Partial. Comet is a full browser with history (cleared in Incognito). Assistant thread history across devices is not documented.

Integrations — Grok Wins

Integrations: Grok compared with Comet
Feature	Grok	Comet
Web Search / Browsing	Yes. Real-time focus	Yes, requires free plan. Comet is built around Perplexity’s answer engine in the address bar and assistant.
Plugins / Extensions	No	Yes, requires free plan. Chromium extensions are supported; Incognito disables them unless you turn them back on.
API Access	Yes, requires pro plan	No. Comet is a browser. Programmatic access is the separate Perplexity API, not a Comet REST product.
Zapier Integration	Yes. Zapier lists Grok by xAI as an official app. Zaps can Ask Grok, categorize text, extract fields from text or images, and generate images from a prompt.	Unknown. No first-party Comet Zapier app was checked.
Custom GPTs / Bots	No	Partial. Email Assistant and Background Assistants are Max-tier agents, not a public custom-GPT store.
Real-time Collaboration	No	Unknown. Shared multiplayer browsing sessions are not documented.
Live Social Data Integration	Yes. Real-time X data	No. Not a live social-firehose product; it can browse social sites like any browser.
Live Citation Mapping		Partial. Comet uses Perplexity’s answer engine, which cites sources on perplexity.ai; Comet help does not separately document citation UI in the sidecar.

Developer — Grok Wins

Developer: Grok compared with Comet
Feature	Grok	Comet
Function Calling	Yes. The xAI API supports function calling: you define custom tools and Grok returns tool-call requests for your app to execute, alongside built-in tools such as web search, X search, and code interpreter.	Yes, requires free plan. The assistant is documented taking multi-step actions (shop, email, fill forms) rather than only answering.
Streaming Responses	Yes. The xAI API streams Grok text output over Server-Sent Events. Set stream: true on chat completions; all text-capable Grok models support it, including grok-4.6.	Unknown. Token streaming in the sidecar is not called out in Comet help.
Fine-Tuning	No	No. Comet runs hosted Perplexity/partner models; there is no custom-weight training product.
Embeddings API	No	No. Not an embeddings API product.
Structured Output (JSON)	No	Unknown. JSON-schema guarantees are not documented for the Comet assistant.
Reasoning / Thinking Mode	Yes. Auto populated	Partial. Max Assistant on Comet is documented as a slower, routed reasoning mode for Max subscribers, not a free Deep Think toggle.
Local Execution		No. The browser runs locally; model inference stays on Perplexity’s cloud.
Open Weights		No. Comet is not an open-weights model release.
Multi-Agent Orchestration	Yes. Four-agent backend	Partial. Background Assistants (Max) run tasks asynchronously; that is not a general multi-agent SDK.

Platforms — Tie

Platforms: Grok compared with Comet
Feature	Grok	Comet
Web App	Yes	No. You download Comet. The marketing site is not a browser-in-the-browser web app.
iOS App	Yes. Via X app	Yes, requires free plan. Perplexity launched a Comet iOS app; the product page lists iOS.
Android App	Yes. Via X app	Yes, requires free plan. The product page lists Android alongside desktop.
Desktop App	No	Yes, requires free plan. Standalone Mac and Windows browser; setup help covers install and default-browser.
Chrome Extension	No	No. Comet is not distributed as a Chrome Web Store extension.

Privacy — Grok Wins

Privacy: Grok compared with Comet
Feature	Grok	Comet
GDPR Compliant	Yes	Unknown. Needs a read of Perplexity’s current DPA before we assert GDPR for Comet.
Opt Out of Data Training	No	Unknown. Training opt-out is not documented on the Comet privacy-and-safety article we checked.
Enterprise Privacy Mode	No	Partial. Comet supports Chrome-like MDM policies (extensions, cookies, data clearing). That is not a published ZDR/SSO suite.

Workspaces — Tie

Workspaces: Grok compared with Comet
Feature	Grok	Comet
Projects / Folders	No	Unknown. Browser profiles exist; Perplexity Spaces inside Comet were not confirmed.