There are a lot of AI search tools competing for attention. Here is a clear breakdown of which ones your business should optimise for in 2026.
The AI search landscape in 2026 is dominated by six engines, each with a different user base, strengths, and citation behaviour. Understanding which ones matter for your business depends on who your customers are.
The honest news is that you do not need to optimise for each one separately. The same foundations of schema markup, llms.txt, topical depth and clear answers benefit you across all of them. But knowing where your customers actually are helps you measure success.
ChatGPT is the largest AI engine by user count, with over 800 million weekly users. It is built by OpenAI and powers the conversational interface most people think of when they hear the phrase AI assistant.
Everyone, but skewed slightly younger and more professional than the general population. Heavy use among knowledge workers, students, and consumers researching products and services.
ChatGPT pulls from its training data plus, when web search is enabled, live sources via Bing. Citations appear as inline links and a sources panel. Getting cited requires strong content depth, clear authoritative answers, and presence in the broader web ecosystem.
Very high. If you only optimise for one AI engine, this is it.
Perplexity is purpose built as an answer engine. It does live web search on every query, summarises the answer, and shows citations prominently. It is the closest thing to a direct Google replacement and has rapidly grown to tens of millions of users.
Researchers, professionals, decision makers and tech early adopters. Lower volume than ChatGPT but higher intent per query.
Citations are front and centre. Every answer shows the sources it pulled from, with clickable links. Getting cited by Perplexity is the most measurable AI search win, because the citation is visible and tracked.
High. Particularly important if you sell to professional or B2B audiences.
Claude is made by Anthropic and is rapidly growing in user count and reach. It is favoured by professionals, developers, and writers for the quality and reasoning of its answers. Recently launched a major web search feature that brings it into direct competition with ChatGPT and Perplexity.
Skews professional and technical. Heavy use in research, writing, coding, and complex decision making contexts.
When web search is active, Claude shows inline citations and a sources panel similar to ChatGPT. Strong preference for authoritative sources with clear expertise signals.
Medium to high and rising. Worth optimising for if you serve professional, technical or B2B audiences.
AI Overviews are the AI generated summaries that now appear at the top of many Google search results. Most users do not even realise they are using an AI engine, but they are. AI Overviews now appear on a substantial share of UK Google searches and often push the first organic result below the fold.
Anyone using Google. The reach is massive but invisible to most users.
Cites a small number of source links alongside the AI generated summary. Strongly favours sites with high traditional Google authority, good schema, and clear question and answer formatting.
Very high. Effectively non optional if you care about Google traffic at all.
Gemini is Google's standalone AI assistant. Microsoft Copilot is built into Windows, Microsoft 365, and Bing. Both have huge potential reach because they are baked into ecosystems people already use, but standalone usage is lower than ChatGPT or Perplexity.
Gemini sees use across Google's ecosystem (Workspace, Android, Chrome). Copilot sees heavy use in corporate and Windows environments.
Both show inline citations when answering factual queries with web search active. The signals they look for are similar to ChatGPT and Google AI Overviews.
Medium. Worth covering through good general AI search optimisation rather than as standalone targets.
Talk to Protechmedia about AI Search Optimisation for your business. We will explain exactly where you stand today and what it would take to get cited by every major AI engine.