A side-by-side look at a general-purpose assistant and an answer engine, drawn from their index records.
Compare selectedUp to four tools can be compared at once. Remove one to add another.
At a glance
The practical difference is default behaviour, not raw capability: ChatGPT is a general assistant that can browse and cite, while Perplexity is built around cited web answers by default. Sourced rows carry a per-product verification state.
A free tier is available; ChatGPT Plus, Pro, Business, and Enterprise plans add newer models such as GPT-6 Astra, higher usage limits, and administrative controls. Pricing ↗
A free tier is available; Perplexity Pro adds more Deep Research queries, frontier model choice, and file limits.
General assistant (write, code, agents) Not independently verified — Editorial characterisation written to compare the products; no single vendor page states it in these words.
Cited web / research answers Not independently verified — Editorial characterisation written to compare the products; no single vendor page states it in these words.
Default output
Conversation, files, and tools Not independently verified — Editorial characterisation written to compare the products; no single vendor page states it in these words.
Synthesized answer with sources Not independently verified — Editorial characterisation written to compare the products; no single vendor page states it in these words.
Freemium — free tier with paid plans (tiers not confirmed) Not independently verified — The official pricing page returned HTTP 403 to automated requests on 2026-10-09, so plan tiers could not be read.
Freemium — free tier with paid plans (tiers not confirmed) Not independently verified — The help-centre article returned HTTP 403 to automated requests on 2026-10-09, so plan tiers could not be read.
Citations
Conversational answers; cites web sources when browsing is enabled Source ↗ From the product record
Cited web answers by default Source ↗ From the product record
Updated
2026-10-10
2026-10-09
Fields taken from the product records use the record dates shown. Sourced claims are labelled per product: verified against the linked page on the date shown, taken from the product record without re-checking, or not independently verified.
Quick answer
ChatGPT, Perplexity can be used free of charge to start.
Identical on the record: Business model, Licence, Where it runs, Works offline, Runs on, Launched.
When to choose each
ChatGPT — When you want a general assistant for drafting, coding, files, GPTs, and longer agent tasks, not only a cited web answer.
Perplexity — When the job is a sourced answer from the live web or papers, with citations you can open, rather than a general chatbot.
ChatGPT is made by OpenAI. The record lists it as Freemium, first recorded in 2022, and fit for Drafting and editing text. Its values below carry their own source and date.
ChatGPT is listed under AI Assistants: General-purpose conversational AI assistants and chatbots.
Company
OpenAI
Category
AI Assistants
Business model
Freemium
Licence
proprietary
Launched
2022-11
Availability
Global
Tasks it fits
Drafting and editing text
How you use it
Web app
Runs on
Web
Where it runs
Vendor cloud
Works offline
Not recorded
Commercial use
Not recorded
Pricing on the record: A free tier is available; ChatGPT Plus, Pro, Business, and Enterprise plans add newer models such as GPT-6 Astra, higher usage limits, and administrative controls.
Sources on the record: Official website, Introducing GPT-6 Astra (OpenAI), Official pricing, Help centre.
Not recorded for ChatGPT: Works offline, Commercial use. An empty field is reported as unknown rather than guessed.
Perplexity is made by Perplexity AI. The record lists it as Freemium, first recorded in 2022, and fit for Research with citations, Search. Its values below carry their own source and date.
Perplexity is listed under Answer Engines: Services that answer questions directly by combining search with generative AI.
Company
Perplexity AI
Category
Answer Engines
Business model
Freemium
Licence
proprietary
Launched
2022-12
Availability
Global
Tasks it fits
Research with citations, Search
How you use it
Web app
Runs on
Web
Where it runs
Vendor cloud
Works offline
Not recorded
Commercial use
Not recorded
Pricing on the record: A free tier is available; Perplexity Pro adds more Deep Research queries, frontier model choice, and file limits.
Sources on the record: Official website, Perplexity AI (Wikipedia), Overview - Perplexity.
Not recorded for Perplexity: Works offline, Commercial use. An empty field is reported as unknown rather than guessed.
Frequently asked questions
Which of these has been available longest?
ChatGPT — first recorded in 2022.
Which of these can I start using for free?
Free to start: ChatGPT, Perplexity.
Which of these is open source?
None of these is open source; every tool in this comparison is proprietary.
Which of these works offline?
None of these is recorded as working offline.
Which of these has a public API?
A public API is recorded for ChatGPT, Perplexity.
Which platforms do these run on?
Recorded platforms — ChatGPT: Web · Perplexity: Web.
Can any of these be self-hosted or run locally?
None of these is recorded as self-hosted or local; all run as a hosted service.
Is ChatGPT with browsing the same as Perplexity?
They overlap. ChatGPT is indexed as a general assistant that can browse; Perplexity is indexed as an answer engine built around cited search. Choose by the default job, not a score.
Which one is better for research?
This index does not rank quality. Perplexity is grouped with answer engines that emphasize citations; ChatGPT is grouped with general assistants. Academic-oriented engines are listed separately in the answer-engines guide.
Do both tools show sources?
Yes. This index records ChatGPT as citing web sources when browsing is used, and Perplexity as citing by default. Treat "only one of them shows sources" as a claim to check, not a rule; behaviour depends on your question and settings.
How to use a comparison
Start from the task, not the brand: filter the index by what you need to get done.
Check the evidence: a value marked “verified” names the source page and the date it was checked.
Prefer the vendor’s own page for the final decision: prices and limits change without notice.