Short answer
If you want one question answered with several source links that you can click and check, use Perplexity. If you search and then want to keep going in the same conversation, writing, building a table or translating, use ChatGPT. Perplexity opens on a search answer. ChatGPT opens on a conversation with search attached. Either way, a link does not make the content correct, so open the link and check numbers and dates yourself.
Side by side
Some sources say the free deep-search limit on Perplexity is 3 a day and others say 5, so no number is given here. The official help pages did not settle on one figure, and it changes with usage and over time. Your subscription screen shows how many you have left.
Default screen
- Perplexity
- A question box that gives a search answer straight away
- ChatGPT (with search on)
- A chat window. Search is used when needed, or you switch it on
Citations
- Perplexity
- Numbers in the answer text, plus a source list
- ChatGPT (with search on)
- Source links attached to the answer. How they look depends on the app version
Good for
- Perplexity
- Recent news, product comparisons, questions that need evidence
- ChatGPT (with search on)
- Turning search results into writing, tables or code right away
Continuing
- Perplexity
- Narrow things down with follow-up questions
- ChatGPT (with search on)
- Stretch the same chat into file analysis, image creation and more
Free use
- Perplexity
- Free to use, with a limit on deep searches. Check the count on your account screen
- ChatGPT (with search on)
- Free to use, but limits and features vary by plan (see the official pricing page)
Paid
- Perplexity
- See the official pricing page
- ChatGPT (with search on)
- See the official pricing page
Scenario 1: checking an announcement from yesterday
Ask "What is the policy that was announced yesterday?" with search off, and an AI cannot know. Anything after its training date is not in what the model learned. That is why both services go through search.
The difference is the shape of the answer. Perplexity is built so you can follow each sentence to a numbered source. ChatGPT tends to run longer, with sources attached at the end or in the middle. Which one is easier depends on how many links you plan to click.
Scenario 2: turning research into a report
If you want to go from search results to "make this a one-page report," "put it in a table" or "translate it," ChatGPT takes fewer steps. The chat was designed for that, and file upload and image creation are in the same window.
Perplexity takes follow-up questions too, but polishing a long piece of writing feels more natural in a conversational AI. A common order is to gather evidence in Perplexity and build the document in ChatGPT.
When a source link is there and the answer is still wrong
This can happen on either service. Narrowing what you check to three things, numbers, dates and the names of laws or policies, saves time. The hallucination article covers how to check in more detail.
- The link opens, but the number the AI quoted is not in the text.
- The source is a blog or forum post. It reads like government statistics, but it is not the original data.
- Two sources give values from different dates, and the AI blends them into one.
Using both
One method is to put the same question into both and trust only where the sources overlap. For a number that appears on one side only, open the link and decide for yourself. It works within the free tiers.
Find survey results on the number of US households that own a cat, from 2025 if available. Put the organization that ran the survey, the publication date and the figure in a table, with a link to the original source on every row. Write "could not verify" for any value you could not confirm in the original.
See whether the two answers agree on the organization and the figure. Also see whether the links go to an original source, such as a government agency or trade association, or to a blog. Change the year and topic to whatever you need.
What trips people up when switching
Chat history and saved memory in ChatGPT do not move to Perplexity, and the reverse is also true. Keep the prompts you like in a notes file. For questions about a specific country, check that sources from that country actually show up.
FAQ
How much does Perplexity do for free?
You can use it free, and features such as deep search are limited by count. Public sources disagree on the exact count, so check your own subscription screen.
Is ChatGPT search free?
You can use it on the free plan, but limits and features differ by plan and change over time. Check the official pricing page and OpenAI's help pages for the current rules.
If an answer has sources, can I trust it?
No. Having a link and the link supporting the answer are separate things. Open the link and compare numbers and dates.
Can I use either for research papers?
As a starting point, yes. But confirm that a paper's title and authors actually exist, using Google Scholar or a library search.
Keep going
Checked against sources on 2026-11-05. Sources: Perplexity help center. How we write