ChatGPT vs Comet
A feature-by-feature comparison of ChatGPT and Comet across 7 capability categories.
Modalities — ChatGPT Wins
| Feature | ChatGPT | 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, requires plus plan. DALL-E 3 | Unknown. Image models exist on Perplexity web for some plans; not documented as a Comet browser feature. |
Voice Mode | Yes, requires plus plan. Advanced voice mode | Unknown. Launch copy mentioned voice on mobile; the current Comet product page does not document a voice loop. |
Video Understanding | Yes. Via file upload/YouTube | Unknown. Perplexity can transcribe attached video on the web app; Comet-specific video understanding is not documented. |
Video Generation | Yes, requires plus plan. Sora video generation is available inside ChatGPT on paid plans. | No. Not a video generation product. |
File Upload (PDF, DOCX) | Yes | Unknown. File attach is documented for Perplexity search, not as a Comet browser control. |
Code Execution | Yes, requires plus plan. Advanced Data Analysis | Unknown. The marketing site shows the assistant building a webpage in the browser; that is not a documented code sandbox. |
Audio Input | Yes | Unknown. Audio-file input is not described in Comet setup or privacy help. |
Canvas / Artifact Editor | Yes. Canvas feature | Yes, requires free plan. The assistant sits in a sidecar beside the page you are browsing. |
Screen Sharing / Computer Use | Paid Only. Advanced Voice on iOS and Android can share the screen for eligible subscribers. Live Voice does not support screen sharing. | Yes, requires free plan. The assistant is documented acting on the live page (forms, shopping, posting) rather than only summarizing. |
Memory & Context — ChatGPT Wins
| Feature | ChatGPT | Comet |
|---|---|---|
Persistent Memory | Yes, requires plus plan | 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 | Yes | 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 — ChatGPT Wins
| Feature | ChatGPT | Comet |
|---|---|---|
Web Search / Browsing | Yes | Yes, requires free plan. Comet is built around Perplexity’s answer engine in the address bar and assistant. |
Plugins / Extensions | No. Replaced by GPTs | 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 | Unknown. No first-party Comet Zapier app was checked. |
Custom GPTs / Bots | Yes. Custom GPTs / GPT Store | Partial. Email Assistant and Background Assistants are Max-tier agents, not a public custom-GPT store. |
Real-time Collaboration | Partial. Chats can be shared and Projects shared with a team, but there is no live multiplayer session. | Unknown. Shared multiplayer browsing sessions are not documented. |
Live Social Data Integration | No. No live social firehose; web search is general web, not X/Twitter streams. | No. Not a live social-firehose product; it can browse social sites like any browser. |
Live Citation Mapping | Partial. Search and Deep Research cite sources in the thread; it is not a dedicated citation-map UI like Perplexity. | 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 — ChatGPT Wins
| Feature | ChatGPT | Comet |
|---|---|---|
Function Calling | Yes, requires pro plan | Yes, requires free plan. The assistant is documented taking multi-step actions (shop, email, fill forms) rather than only answering. |
Streaming Responses | Yes | Unknown. Token streaming in the sidecar is not called out in Comet help. |
Fine-Tuning | Yes, requires pro plan | No. Comet runs hosted Perplexity/partner models; there is no custom-weight training product. |
Embeddings API | Yes, requires pro plan | No. Not an embeddings API product. |
Structured Output (JSON) | Yes | 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. Closed weights; runs only on OpenAI infrastructure. | No. The browser runs locally; model inference stays on Perplexity’s cloud. |
Open Weights | No. Closed weights; GPT models are not downloadable. | No. Comet is not an open-weights model release. |
Multi-Agent Orchestration | Partial. Agent / Operator can run multi-step tool use; it is not a user-facing swarm of sub-agents like Claude Agent Teams. | Partial. Background Assistants (Max) run tasks asynchronously; that is not a general multi-agent SDK. |
Platforms — ChatGPT Wins
| Feature | ChatGPT | Comet |
|---|---|---|
Web App | Yes | No. You download Comet. The marketing site is not a browser-in-the-browser web app. |
iOS App | Yes | Yes, requires free plan. Perplexity launched a Comet iOS app; the product page lists iOS. |
Android App | Yes | Yes, requires free plan. The product page lists Android alongside desktop. |
Desktop App | Yes | 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 — ChatGPT Wins
| Feature | ChatGPT | Comet |
|---|---|---|
GDPR Compliant | Yes | Unknown. Needs a read of Perplexity’s current DPA before we assert GDPR for Comet. |
Opt Out of Data Training | Yes | Unknown. Training opt-out is not documented on the Comet privacy-and-safety article we checked. |
Enterprise Privacy Mode | Yes, requires enterprise plan | Partial. Comet supports Chrome-like MDM policies (extensions, cookies, data clearing). That is not a published ZDR/SSO suite. |
Workspaces — ChatGPT Wins
| Feature | ChatGPT | Comet |
|---|---|---|
Projects / Folders | Yes. Projects feature | Unknown. Browser profiles exist; Perplexity Spaces inside Comet were not confirmed. |