ChatGPT, Perplexity and Google's AI features in Search differ in how they search and present sources, and can give different answers to the same question. You don't start from the platform but from your customer: you build one strong common base of clear, well-sourced content, check each platform's technical requirements, and measure separately where you appear. Priority comes from where your customers search, not from which platform is talked about most.
You ask ChatGPT: "Which accounting firm handles startups in Thessaloniki?" You open Perplexity and ask the same thing. Then you type it into Google and, if an AI Overview appears, you get a short synthesised answer at the top of the results page, drawing on several sources.
The three ways of searching can lead to different answers, different sources, and different recommendations.
The question isn't which platform is best in general. It's which one matters more for your audience, and for the questions people ask right before they buy or get in touch.
To answer that, you first need to see how each one works.
How does each platform work, and what need does it serve?
All three can answer questions using information from the web. Where they differ is in their core purpose and in how they present the results.
ChatGPT is a general AI assistant that also has a search function. When ChatGPT Search is used, it can look up relevant information on the web, synthesise it into an answer, and show links and citations to its sources.
Perplexity is built mainly for search and research with visible citations. In its Search experience, answers are supported with links to sources so the user can inspect the information and continue researching.
That makes it especially useful for research and comparison questions. It doesn't mean that every user is a professional, or necessarily close to a buying decision.
Google embeds AI-generated answers into the search experience through AI Overviews and AI Mode. Both can use a technique Google calls query fan-out: they run several related searches around sub-topics and different data sources to assemble the answer.
Google doesn't publish a fixed number of sub-searches per query.
Which one has the most reach?
There's no single metric that allows an absolute comparison of their reach.
In May 2026, Google announced more than 2.5 billion monthly active users for AI Overviews and more than 1 billion for AI Mode. OpenAI said on 6 August 2026 that 1 billion people use ChatGPT every week.
These figures aren't directly comparable. Google counts monthly users of specific features within Google Search, while OpenAI counts weekly users of all of ChatGPT.
They do show, though, that both Google's AI features and ChatGPT are used by an extremely large audience.
For a business, what matters isn't only total reach. It's how often your own customers use each platform for the specific questions that come right before a purchase or a contact.
The official figures confirm the massive use of both. They don't support an absolute ranking, because they rest on different time periods and different ways of counting.
How does each platform show its sources?
The number and type of sources aren't fixed. They can change with the question, the feature used, the topic, and the moment.
ChatGPT Search can show citations within the answer text and an additional set of related sources.
Perplexity shows citations and links to the original sources inside the answer.
Google's AI Overviews and AI Mode show links to sources they consider relevant and supporting of the answer.
Analyses show that source sets can differ significantly between platforms. In an Ahrefs analysis for June 2025, only 7 sites appeared at the same time in the top-50 most-cited lists of ChatGPT, Perplexity, and Google AI Overviews.
That finding covers a specific sample and a specific period. It isn't a permanent overlap rate.
The finding reinforces the practical need to check and measure a business's presence separately on each platform.
Do you need different content for each platform?
You don't need to create different content for each platform.
The common base is clear, useful, well-sourced content, organised so the reader can quickly find the information they need.
In many cases it helps to give the substantive answer early. That improves readability and helps the user find what they're after faster. It isn't a published technical requirement of ChatGPT, Perplexity, or Google's AI features.
So you don't need to write the same article three times to "satisfy" each platform.
There are two common mistakes.
The first is applying exactly the same strategy everywhere and expecting the same results, ignoring that each platform may draw on a different set of sources.
The second is creating three separate versions of the same content, tripling the work for no real reason.
The right approach is one strong common content base, the technical checks each platform requires, and separate measurement of your presence on each one.
Build clear, well-sourced pages, keep your business details consistent, and make sure your information is accurate and consistent off your own site too:
- on credible industry sources,
- in relevant directories,
- in reviews,
- in active, credible communities where your field is discussed.
There's no published formula proving that references to encyclopedic sources raise your presence on ChatGPT, or that starting discussions on Reddit raises it on Perplexity.
For Google, the core SEO practices still form the base for both AI Overviews and AI Mode. No separate "AI content" or special markup is required.
Where should you focus for your industry?
Priority depends on where your customers look for information, not on which platform gets talked about most.
Your industry can give a first indication of where to focus. The final decision, though, should rest on real tests and data.
If you run a local business, hotel, restaurant or physical shop, your first priority stays your overall presence in Google's ecosystem:
- Google Business Profile,
- Maps,
- local results,
- organic search.
AI Overviews, AI Mode and ChatGPT are additional places your business can appear. They don't replace local presence.
If you work in business software, such as B2B software or SaaS, AI tools — with ChatGPT as a prominent example — are taking on growing importance at the research stage.
In a G2 survey in March 2026 of 1,076 business-software buyers, 51% said they start their software research in an AI tool such as ChatGPT more often than on Google, versus 29% in April 2025.
The finding covers B2B software buyers. It shouldn't be generalised automatically to all professional services, such as lawyers, accountants or consultants.
If you run an online shop, Google Search, Shopping, Merchant Center and product-data quality remain an important part of search and product discovery for many online shops.
ChatGPT, Perplexity and other AI assistants take on a role in comparison and product discovery. Their real priority, though, should come from your store and market data.
None of these priorities is an absolute rule.
They're starting points. You look first at where your customers are most likely to search, measure it, and adjust your effort based on what you see.
When don't you need to invest in all three?
When your site has vague content, missing details or serious technical problems, the first priority is to fix the base.
A weak site doesn't rule out your business being mentioned through third-party sources, such as:
- articles,
- directories,
- reviews,
- industry media.
But it limits your own site's ability to be used as a source, and reduces the control you have over the information the engines find.
For a purely local business, Perplexity may be a lower priority than Google Search, Maps and Google Business Profile.
This should be confirmed with real test queries, traffic data and customer data. Lower priority doesn't mean your customers don't use the platform at all.
The rule is simple:
You don't invest in a platform just because it exists. You invest because that's where your customers look for information.
Pushing on three fronts at once, without knowing which one pays off, burns time and budget with no clear priority.
What does this mean in practice for your business?
You don't start from the platform. You start from your customer.
You build a strong content base that answers their real questions clearly. You look at where they search and put the emphasis where the value is greater.
The platforms keep evolving their models, their search features and the way they present sources.
That's why individual percentages and citation patterns should be treated as snapshots of a specific period, not permanent rules.
What doesn't change is the base:
- clear information,
- good structure,
- answers to the questions customers actually ask,
- consistent details,
- a credible presence on and off your site.
The rest is a matter of priority and measurement.
At Praion we don't treat ChatGPT, Perplexity and Google as three separate campaigns.
We build a common base of content and technical infrastructure that creates better conditions for visibility across all three platforms. Then we measure separately where the business appears and adjust our actions accordingly.
AEO describes the actions aimed at improving a business's presence in AI engines' answers.
Those actions can create better conditions for visibility. They don't guarantee a particular ranking, citation or result.
AI engines keep changing how they search, evaluate and present their sources.