Which AI systems should I know about?

A practical guide to ChatGPT, Google AI Overviews and AI Mode, Gemini, Perplexity and Claude: how they use the web and what businesses should track.

Which AI system should I focus on?

Focus on the systems that are genuinely relevant to your audience and the questions your customers ask. There is no universal priority order for every business. Start with a small set of real questions and test them in ChatGPT, Google, Perplexity, and any other systems your audience actually uses.

Do I need different content for each AI system?

No. Your core public information — services, location, terms, contact details, and answers to real customer questions — should be accurate regardless of platform. What can differ is the technical access and the way each system finds or displays sources.

Do I need to track every AI system?

Not necessarily. Start with the systems most relevant to your audience and use a consistent set of questions. If you do not yet know which platforms your customers use, test more of them initially and narrow your monitoring once you have your own data.

What is the difference between Gemini and Google AI Overviews or AI Mode?

AI Overviews and AI Mode are features within Google Search. Gemini is Google's separate AI application. All can use information from the web, but their user experience, source use, and presentation are not the same.

Are these the only AI systems worth tracking?

No. This is not an exhaustive list and there is no official 'top five.' Systems such as Microsoft Copilot or more specialised services may matter depending on your audience, industry, and market.

Do all of these systems always search the web?

No. Web use depends on the system, feature, settings, and the question itself. When measuring visibility, record whether the specific response actually used or displayed public sources.

Which of these systems show sources or citations?

ChatGPT Search, Perplexity, and Claude with web search can show citations. Google AI Overviews and AI Mode surface links to sources, while Gemini can display sources or related links depending on the feature.

Can the same question produce different sources across AI systems?

Yes. Each system uses different search, retrieval, and source-selection mechanisms, and results can also change over time. That is why it is useful to test the same questions and compare both whether you appear and which sources are used.

Which AI systems should businesses know?

QUICK ANSWER

There is no official list of the "main AI engines." For businesses, however, five systems are currently worth understanding and tracking where they are relevant to the audience: ChatGPT, Google AI Overviews and AI Mode, Gemini, Perplexity, and Claude. They do not all work the same way, and they do not necessarily use the web for every answer.

In this article, AI engine is a practical label for services that generate AI answers and, in some features, can use information from the web. It is not a formal shared category, and this list is not exhaustive. Systems such as Microsoft Copilot may also matter for particular audiences. These services do not all work the same way, and there is no single source-selection algorithm shared across them.

ChatGPT

ChatGPT can search the web when a question benefits from current or external information, either automatically or when the user selects Search. Answers that use web search can include citations and links to sources.

For a business, it is more useful to test real customer questions such as:

"I'm looking for an accounting firm in Kozani for a sole proprietorship. Which firms publicly state that they support myDATA, and what information can I check before getting in touch?"

Google AI Overviews and AI Mode

AI Overviews and AI Mode are features of Google Search, not separate search engines outside Google.

AI Overviews can display an AI-generated summary with information and links when Google's systems determine that it may be useful. AI Mode is Google's more conversational search experience, supporting more complex questions, follow-ups, and exploration across multiple sources.

For a business, the important point is that these AI features now sit directly inside Google Search and can surface links to public sources.

Gemini

Gemini is Google's standalone AI app and should not be confused with AI Overviews or AI Mode.

Gemini can display sources or relevant links in some answers, although source use is not identical across every feature. In Deep Research, Google Search is included as a source by default unless the user changes the selected sources.

So, when you measure presence in Gemini, you need to record not only whether a business was mentioned but also whether that specific answer used or displayed public sources.

Perplexity

Perplexity describes itself as an AI-powered search engine. It searches the web and provides answers accompanied by citations and links to the original sources.

This makes it easier for users to see which sources support the answer. That alone does not mean Perplexity users have higher purchase intent or are mainly professionals.

If you want to evaluate it for your own business, ask the same real questions you would ask the other systems and see which sources are used and whether the information is correct.

Claude

Claude supports web search and, when that capability is used, its responses include citations and links to sources.

It is worth including Claude in your measurement if you know that part of your audience or professional environment uses it. The ability to search and cite is not on its own enough to draw conclusions about the quality of the answers or the profile of its audience.

Which one should you focus on?

There is no single right answer for all businesses.

Start with how your audience actually searches, then test a small, consistent set of natural questions across more than one platform.

For example:

"I need a commercial cleaning company in Kozani. Which businesses publicly state that they handle such premises, and what can I check before requesting a quote?"

For each check, record:

which platform you used,
whether a web search was performed,
whether the business appeared,
which sources appeared,
whether the information was accurate,
what important information was missing.

You do not need a different version of the same content for every system. What matters is that your public information is complete, specific, and consistent. The technical requirements and the way sources are accessed may differ per platform, so you shouldn't assume that a change works the same way everywhere.

If you want us to look at which systems really make sense for your case, we start from your customers' questions and the public information that exists today.

The work around AEO can improve the completeness, accuracy and consistency of this information. It does not guarantee appearance, citation, mention, recommendation or a specific position in ChatGPT, Google, Perplexity, Claude, Gemini or any other AI system.