An AEO strategy should target Google's answer surfaces and ChatGPT first, then add platforms by audience fit. Google's AI Overviews reach more than 2 billion monthly users [1], AI Mode passed 1 billion monthly users in May 2026 [2], and ChatGPT reached 900 million weekly active users in February 2026 [3], which puts most of the world's answer-engine activity on those two ecosystems. The second tier depends on who buys from you: Perplexity for research-heavy audiences because its product links the websites behind its answers [9], Microsoft Copilot for enterprise buyers inside the 450-million-seat Microsoft 365 installed base [12], and Claude for technical and professional audiences as the fastest-growing major assistant [4]. Meta AI's 1 billion monthly users sit inside social and messaging apps with little cited-answer surface, which makes it a platform to monitor rather than target [15].
\n","summary":"Reach data, citation behavior, and audience fit for every major answer engine as of mid-2026: Google's AI Overviews, AI Mode, and Gemini, plus ChatGPT, Perplexity, Microsoft Copilot, Claude, and Meta AI. Includes a platform comparison table, a prioritization framework by audience type, and the crawler settings that decide whether each platform can cite your site at all.","publishedAt":"2026-08-19T14:15:05.417","verifiedAt":"2026-08-09T00:00:00","editorialStatus":"APPROVED","lastReviewedAt":"2026-08-09T00:00:00","nextReviewDueAt":"2026-11-09T00:00:00","templateVersion":"v2","aliases":["Which AI platforms matter most for AEO","Best answer engines to optimize for","Where to focus answer engine optimization efforts","AI platform prioritization for AEO","Which AI search engines should you target","Should AEO target ChatGPT or Google first","Which AI assistants cite websites","AEO channel strategy by platform","What answer engines should marketers optimize for","How to choose AI platforms for answer engine optimization"],"confidenceScore":84,"confidenceLabel":"High","canonicalUrl":null},"contributor":{"id":"ec39deab-44fe-48d8-9029-fefe993ab85a","slug":"answer-stack","displayName":"AnswerStack","websiteUrl":null},"contributorOrganizationProfile":{"entityId":"ec39deab-44fe-48d8-9029-fefe993ab85a","legalName":null,"description":null,"websiteUrl":null,"imageUrl":null,"slogan":null,"subtitle":null,"facts":[],"coiNote":null,"foundingDate":null,"numberOfEmployeesText":null,"contactPoint":null,"address":null,"headquartersText":null,"organizationType":null},"contributorPerson":{"slug":"answerstack-editorial-team","displayName":"AnswerStack Editorial Team"},"sections":[{"id":"aca3d144-fc87-4691-8303-33ddd177b220","sectionKey":"how_to_decide","sectionType":"markdown_section","heading":"How do you decide which AI platforms to target?","introMarkdown":"Three variables decide the target list: how many of your buyers actually use a platform, whether that platform cites external websites in its answers, and whether you can influence what it retrieves. Scored that way, the field sorts into a clear hierarchy. Google's answer surfaces and ChatGPT sit at the top because they combine enormous reach with documented, controllable citation mechanics. AI Overviews reach more than 2 billion monthly users [1], AI Mode passed 1 billion monthly users within roughly a year of launch [2], and ChatGPT hit 900 million weekly active users in February 2026 [3]. No other platform comes within an order of magnitude of that combined footprint.\n\nThe citation question filters the list further, because raw reach means nothing for AEO if a platform never links out. Meta AI reported 1 billion monthly users in May 2025 [15], yet its assistant lives inside Facebook, Instagram, WhatsApp, and Messenger, where conversations rarely surface cited web pages. Perplexity is the opposite case: a far smaller user base [10], but a product built around linking to the pages behind its answers [9], which makes each Perplexity user disproportionately valuable as a citation and referral source.\n\nRetrievability is the variable you control directly. Google states that appearing in AI Overviews and AI Mode requires nothing beyond standard Search indexing and snippet eligibility [5]. OpenAI, Perplexity, and Anthropic each publish named crawlers with separate robots.txt controls for search visibility versus model training [8][9][13], so a single overzealous firewall rule or CDN bot filter can silently remove a site from several answer engines at once.\n\nOne caution frames everything below: ChatGPT's share of generative AI site visits fell from about 76% to roughly 53% in the twelve months to May 2026 while Gemini and Claude absorbed most of the difference [4]. Every figure in this answer carries its reporting date for that reason, and any prioritization built on these numbers should be revisited quarterly.","introHtml":"Three variables decide the target list: how many of your buyers actually use a platform, whether that platform cites external websites in its answers, and whether you can influence what it retrieves. Scored that way, the field sorts into a clear hierarchy. Google's answer surfaces and ChatGPT sit at the top because they combine enormous reach with documented, controllable citation mechanics. AI Overviews reach more than 2 billion monthly users [1], AI Mode passed 1 billion monthly users within roughly a year of launch [2], and ChatGPT hit 900 million weekly active users in February 2026 [3]. No other platform comes within an order of magnitude of that combined footprint.
\nThe citation question filters the list further, because raw reach means nothing for AEO if a platform never links out. Meta AI reported 1 billion monthly users in May 2025 [15], yet its assistant lives inside Facebook, Instagram, WhatsApp, and Messenger, where conversations rarely surface cited web pages. Perplexity is the opposite case: a far smaller user base [10], but a product built around linking to the pages behind its answers [9], which makes each Perplexity user disproportionately valuable as a citation and referral source.
\nRetrievability is the variable you control directly. Google states that appearing in AI Overviews and AI Mode requires nothing beyond standard Search indexing and snippet eligibility [5]. OpenAI, Perplexity, and Anthropic each publish named crawlers with separate robots.txt controls for search visibility versus model training [8][9][13], so a single overzealous firewall rule or CDN bot filter can silently remove a site from several answer engines at once.
\nOne caution frames everything below: ChatGPT's share of generative AI site visits fell from about 76% to roughly 53% in the twelve months to May 2026 while Gemini and Claude absorbed most of the difference [4]. Every figure in this answer carries its reporting date for that reason, and any prioritization built on these numbers should be revisited quarterly.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":0},{"id":"23cac742-0ec3-4e28-9941-a5e221ccf86c","sectionKey":"platform_comparison","sectionType":"table_section","heading":"How do the major answer engines compare?","introMarkdown":"Reach figures below are the most recent platform-reported or independently measured numbers available as of August 2026, with reporting dates noted. They are not directly comparable across platforms: some companies report weekly users, some monthly, and Microsoft discloses mostly paid seats.","introHtml":"Reach figures below are the most recent platform-reported or independently measured numbers available as of August 2026, with reporting dates noted. They are not directly comparable across platforms: some companies report weekly users, some monthly, and Microsoft discloses mostly paid seats.
\n","outroMarkdown":"A table row cannot capture how differently these platforms behave in practice, so the sections below explain each one and the concrete action it calls for.","outroHtml":"A table row cannot capture how differently these platforms behave in practice, so the sections below explain each one and the concrete action it calls for.
\n","contentJson":{"rows":[{"cells":["Google AI Overviews","2B+ monthly users (Jul 2025) [1]","Google's standard search index; no separate optimization required [5]","Links shown inside and alongside the summary [5]"]},{"cells":["Google AI Mode","1B+ monthly users (May 2026) [2]","Query fan-out: multiple related searches across Google's index [5]","Supporting links within the conversational answer [5]"]},{"cells":["Gemini app","750M+ monthly users (Feb 2026) [6]","Some responses grounded on Google Search results [7]","Selective; grounding applies to some responses only [7]"]},{"cells":["ChatGPT","900M weekly users (Feb 2026) [3]","OAI-SearchBot builds its search index; ChatGPT-User fetches pages on request [8]","Inline citations in search-backed answers; present in ~6.8% of US prompts (May 2026) [4]"]},{"cells":["Perplexity","45M+ monthly users; 780M queries in May 2025 [10]","PerplexityBot surfaces and links websites; not used for model training [9]","Linked sources on answers by design [9]"]},{"cells":["Microsoft Copilot","150M monthly users across Copilot products (Oct 2025); 15M paid Microsoft 365 Copilot seats (Jan 2026) [12]","Bing's index through Copilot Search [11]","Prominent inline citations plus a viewable list of every link used [11]"]},{"cells":["Claude","~245M monthly users (mid-2026 estimate) [14]; ~9% of generative AI visits and the fastest growth of any major assistant [4]","Claude-SearchBot indexes for search; Claude-User fetches per user request [13]","Sites surface through user-directed web search [13]"]},{"cells":["Meta AI","1B monthly users (May 2025) [15]","Assistant embedded across Meta's social and messaging apps [15]","Built for conversation inside those apps rather than cited web answers"]}],"columns":["Platform","Reported reach","How it finds content","How it credits sources"]},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":1},{"id":"d003ddda-91cb-4260-ab65-c544ae9906a8","sectionKey":"google_surfaces","sectionType":"markdown_section","heading":"Why do Google's answer surfaces come first?","introMarkdown":"Google runs three overlapping answer surfaces, and together they form the largest AEO target by a wide margin. The efficient part is that one body of work covers all three: Google states there are \"no additional requirements to appear in AI Overviews or AI Mode, nor other special optimizations necessary\" [5]. If a page is indexed and eligible to show a snippet in regular Search, it is eligible for Google's AI answers [5].\n\n### AI Overviews\n\nAI Overviews are the summaries placed on top of standard results, and they reached more than 2 billion monthly users across 200-plus countries as of July 2025, the most recent figure Google has disclosed [1]. Because the feature sits inside default Google Search, it touches more of the general population than every other answer engine combined. The work here is ordinary technical SEO: keep pages indexed and snippet-eligible, then structure content so a short passage can answer the question outright. Google also notes its AI features display \"a wider and more diverse set of helpful links\" than classic results, which opens citation room for pages that never won a top-three blue link [5].\n\n### AI Mode\n\nAI Mode is Google's conversational search tab, and it passed 1 billion monthly users in May 2026 with query volume more than doubling every quarter since launch [2]. It works through query fan-out, issuing multiple related searches across subtopics to assemble one answer [5]. That mechanic rewards sites that cover a topic in depth rather than a single page chasing a single keyword, because a fanned-out query set can pull several of your pages into the same response.\n\n### The Gemini app\n\nThe Gemini app passed 750 million monthly active users in February 2026 [6]. It is a chat assistant rather than a search product, and Google notes that only some Gemini responses are grounded on Search results [7], so citation opportunities are less predictable than in AI Overviews or AI Mode. Gemini visibility rides on the same Google Search foundation, which means it requires no separate program, but you should expect less consistent attribution from it.","introHtml":"Google runs three overlapping answer surfaces, and together they form the largest AEO target by a wide margin. The efficient part is that one body of work covers all three: Google states there are "no additional requirements to appear in AI Overviews or AI Mode, nor other special optimizations necessary" [5]. If a page is indexed and eligible to show a snippet in regular Search, it is eligible for Google's AI answers [5].
\nAI Overviews are the summaries placed on top of standard results, and they reached more than 2 billion monthly users across 200-plus countries as of July 2025, the most recent figure Google has disclosed [1]. Because the feature sits inside default Google Search, it touches more of the general population than every other answer engine combined. The work here is ordinary technical SEO: keep pages indexed and snippet-eligible, then structure content so a short passage can answer the question outright. Google also notes its AI features display "a wider and more diverse set of helpful links" than classic results, which opens citation room for pages that never won a top-three blue link [5].
\nAI Mode is Google's conversational search tab, and it passed 1 billion monthly users in May 2026 with query volume more than doubling every quarter since launch [2]. It works through query fan-out, issuing multiple related searches across subtopics to assemble one answer [5]. That mechanic rewards sites that cover a topic in depth rather than a single page chasing a single keyword, because a fanned-out query set can pull several of your pages into the same response.
\nThe Gemini app passed 750 million monthly active users in February 2026 [6]. It is a chat assistant rather than a search product, and Google notes that only some Gemini responses are grounded on Search results [7], so citation opportunities are less predictable than in AI Overviews or AI Mode. Gemini visibility rides on the same Google Search foundation, which means it requires no separate program, but you should expect less consistent attribution from it.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":2},{"id":"f51e5052-9ffe-4968-b12b-3fd3c8893494","sectionKey":"chatgpt","sectionType":"markdown_section","heading":"Why is ChatGPT the co-priority?","introMarkdown":"ChatGPT reached 900 million weekly active users in February 2026, up from 800 million the previous October [3]. Its share of generative AI website visits has fallen, from about 76% in June 2025 to roughly 53% in May 2026, but that decline reflects a growing market rather than a shrinking product: absolute visit volume held flat at the largest count of any assistant [4].\n\nTwo mechanics make ChatGPT a controllable target rather than a black box. The first is a dedicated search crawler. OpenAI documents that \"OAI-SearchBot is used to surface websites in search results in ChatGPT's search features\" [8]. Allowing it in robots.txt governs whether your pages can appear in ChatGPT's cited answers, and it is a separate control from GPTBot, which collects content for model training [8]. A site can decline training and remain fully visible in ChatGPT search. The second mechanic is live retrieval: an agent called ChatGPT-User fetches pages in real time when a user asks about them [8], so fast, accessible pages get represented accurately at the moment of the question.\n\nCitations inside ChatGPT are still the exception rather than the rule, but the trend is steep. Citation presence in US prompts rose from about 1.6% in June 2025 to roughly 6.8% in May 2026, and citation rates run above 20% in categories such as travel and automotive [4]. After a May 2026 interface update, ChatGPT also began sending a much larger share of its referrals to brand homepages, roughly 62 to 63% of referral traffic, up from the mid-20s [4]. For planning purposes that means verifying OAI-SearchBot is not blocked at the CDN level, and treating your homepage as a landing page for AI-referred visitors who arrive with high intent and no context.","introHtml":"ChatGPT reached 900 million weekly active users in February 2026, up from 800 million the previous October [3]. Its share of generative AI website visits has fallen, from about 76% in June 2025 to roughly 53% in May 2026, but that decline reflects a growing market rather than a shrinking product: absolute visit volume held flat at the largest count of any assistant [4].
\nTwo mechanics make ChatGPT a controllable target rather than a black box. The first is a dedicated search crawler. OpenAI documents that "OAI-SearchBot is used to surface websites in search results in ChatGPT's search features" [8]. Allowing it in robots.txt governs whether your pages can appear in ChatGPT's cited answers, and it is a separate control from GPTBot, which collects content for model training [8]. A site can decline training and remain fully visible in ChatGPT search. The second mechanic is live retrieval: an agent called ChatGPT-User fetches pages in real time when a user asks about them [8], so fast, accessible pages get represented accurately at the moment of the question.
\nCitations inside ChatGPT are still the exception rather than the rule, but the trend is steep. Citation presence in US prompts rose from about 1.6% in June 2025 to roughly 6.8% in May 2026, and citation rates run above 20% in categories such as travel and automotive [4]. After a May 2026 interface update, ChatGPT also began sending a much larger share of its referrals to brand homepages, roughly 62 to 63% of referral traffic, up from the mid-20s [4]. For planning purposes that means verifying OAI-SearchBot is not blocked at the CDN level, and treating your homepage as a landing page for AI-referred visitors who arrive with high intent and no context.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":3},{"id":"37afb6d3-f6cb-4767-b847-dfc971421253","sectionKey":"second_tier","sectionType":"markdown_section","heading":"Where do Perplexity, Copilot, Claude, and Meta AI fit?","introMarkdown":"None of these four matches the reach of Google or ChatGPT, so each earns a place on the target list only when its audience matches yours.\n\n### Perplexity: small reach, dense citations\n\nPerplexity counts more than 45 million monthly active users and processed 780 million queries in May 2025, the last query figure its CEO disclosed publicly [10]. What it lacks in scale it repays in citation behavior: its crawler documentation states that \"PerplexityBot is designed to surface and link websites in search results on Perplexity\" and is not used for model training [9]. Users who choose a citation-forward engine tend to be doing verification-minded research, which makes Perplexity a priority for finance, health, technical, and policy topics. Allow PerplexityBot, then confirm your key pages render without heavy JavaScript dependence, since retrieval-based engines quote what they can parse.\n\n### Microsoft Copilot: the enterprise default\n\nMicrosoft last reported 150 million monthly active users across its Copilot products in October 2025 and did not refresh that figure at its January 2026 earnings report, though paid Microsoft 365 Copilot seats grew 160% year over year to 15 million against an installed base of 450 million paid Microsoft 365 seats [12]. Reach is concentrated where Microsoft already is: corporate Windows, Edge, and Office environments. Copilot Search is grounded in Bing and \"cites its sources prominently,\" with inline links and a viewable list of every source used in an answer [11]. The action is to register with Bing Webmaster Tools and confirm Bing indexes your key pages, because Bing eligibility is the gate to Copilot citations [11]. If you sell to IT, operations, or any Microsoft-centric buyer, Copilot belongs in your top three.\n\n### Claude: the fastest riser\n\nClaude grew its share of generative AI site visits from about 2% to nearly 9% in the year to May 2026, the largest proportional gain of any platform Similarweb tracked [4]. Third-party estimates put it around 245 million monthly active users by mid-2026, with usage weighted toward professional work: roughly 45% of Claude's API calls originate from enterprise platforms [14]. Anthropic documents three separate crawlers, and the search-relevant ones matter here. Blocking Claude-SearchBot \"may reduce your site's visibility and accuracy\" in search results, and blocking Claude-User prevents retrieval when a user asks about your pages directly [13]. Companies selling developer tools or professional software should treat Claude as a rising second-tier target and verify neither crawler is caught in a generic bot-blocking rule.\n\n### Meta AI: reach without a citation surface\n\nMeta AI reported 1 billion monthly active users in May 2025 across Meta's family of apps [15]. That reach is real, but the assistant operates inside social and messaging contexts where answers rarely function as cited, linkable references to external websites. Until Meta ships an answer surface that credits sources the way search-first platforms do, the reasonable posture is monitoring rather than investment.","introHtml":"None of these four matches the reach of Google or ChatGPT, so each earns a place on the target list only when its audience matches yours.
\nPerplexity counts more than 45 million monthly active users and processed 780 million queries in May 2025, the last query figure its CEO disclosed publicly [10]. What it lacks in scale it repays in citation behavior: its crawler documentation states that "PerplexityBot is designed to surface and link websites in search results on Perplexity" and is not used for model training [9]. Users who choose a citation-forward engine tend to be doing verification-minded research, which makes Perplexity a priority for finance, health, technical, and policy topics. Allow PerplexityBot, then confirm your key pages render without heavy JavaScript dependence, since retrieval-based engines quote what they can parse.
\nMicrosoft last reported 150 million monthly active users across its Copilot products in October 2025 and did not refresh that figure at its January 2026 earnings report, though paid Microsoft 365 Copilot seats grew 160% year over year to 15 million against an installed base of 450 million paid Microsoft 365 seats [12]. Reach is concentrated where Microsoft already is: corporate Windows, Edge, and Office environments. Copilot Search is grounded in Bing and "cites its sources prominently," with inline links and a viewable list of every source used in an answer [11]. The action is to register with Bing Webmaster Tools and confirm Bing indexes your key pages, because Bing eligibility is the gate to Copilot citations [11]. If you sell to IT, operations, or any Microsoft-centric buyer, Copilot belongs in your top three.
\nClaude grew its share of generative AI site visits from about 2% to nearly 9% in the year to May 2026, the largest proportional gain of any platform Similarweb tracked [4]. Third-party estimates put it around 245 million monthly active users by mid-2026, with usage weighted toward professional work: roughly 45% of Claude's API calls originate from enterprise platforms [14]. Anthropic documents three separate crawlers, and the search-relevant ones matter here. Blocking Claude-SearchBot "may reduce your site's visibility and accuracy" in search results, and blocking Claude-User prevents retrieval when a user asks about your pages directly [13]. Companies selling developer tools or professional software should treat Claude as a rising second-tier target and verify neither crawler is caught in a generic bot-blocking rule.
\nMeta AI reported 1 billion monthly active users in May 2025 across Meta's family of apps [15]. That reach is real, but the assistant operates inside social and messaging contexts where answers rarely function as cited, linkable references to external websites. Until Meta ships an answer surface that credits sources the way search-first platforms do, the reasonable posture is monitoring rather than investment.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":4},{"id":"502af4f0-abbd-4a2d-9ffa-f0722b631d53","sectionKey":"audience_prioritization","sectionType":"table_section","heading":"Which platforms should you prioritize for your audience?","introMarkdown":"Google's surfaces and ChatGPT are tier one for every audience type; the meaningful differences show up in tier two. Match the third and fourth platforms to where your specific buyers already spend their day.","introHtml":"Google's surfaces and ChatGPT are tier one for every audience type; the meaningful differences show up in tier two. Match the third and fourth platforms to where your specific buyers already spend their day.
\n","outroMarkdown":"Treat the table as a starting allocation rather than a verdict, and finalize it with your own data. Pull the referrer report from your analytics platform to see which assistants already send you visitors, then check server logs for crawler activity by user agent. A platform whose crawler never visits your site cannot cite it, and in practice that gap is usually a robots.txt entry or CDN bot rule rather than a content problem [8][13].","outroHtml":"Treat the table as a starting allocation rather than a verdict, and finalize it with your own data. Pull the referrer report from your analytics platform to see which assistants already send you visitors, then check server logs for crawler activity by user agent. A platform whose crawler never visits your site cannot cite it, and in practice that gap is usually a robots.txt entry or CDN bot rule rather than a content problem [8][13].
\n","contentJson":{"rows":[{"cells":["B2B and enterprise buyers","Google surfaces, ChatGPT","Microsoft Copilot, Claude","Copilot ships inside a 450-million-seat Microsoft 365 estate [12]; Claude usage tilts toward enterprise and professional work [14]"]},{"cells":["Developers and technical evaluators","ChatGPT, Google surfaces","Claude, Perplexity","Claude posted the fastest growth of any major assistant [4], and Perplexity's linked answers suit spec-checking [9]"]},{"cells":["Consumer and e-commerce","Google surfaces, ChatGPT","Meta AI (monitor only)","The tier-one platforms hold the mainstream reach [1][3]; Meta AI's scale lacks a citation surface [15]"]},{"cells":["Research-heavy niches (finance, health, legal)","Google surfaces, Perplexity","ChatGPT, Claude","Perplexity's source-forward answers fit verification-minded readers [9]"]},{"cells":["Local and regional services","Google surfaces","ChatGPT","AI Overviews sit inside default Google Search, where local discovery already happens [1]"]},{"cells":["Publishers and media","Google surfaces, ChatGPT, Perplexity","Microsoft Copilot","Referral economics dominate, and AI summaries reduce clicks, so citation presence becomes the compensating asset [16]"]}],"columns":["Audience type","Tier one","Tier two","Why"]},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":5},{"id":"b0fd8d25-27e8-4912-87e8-962d90d2572b","sectionKey":"trade_offs","sectionType":"markdown_section","heading":"Trade-offs and what to watch","introMarkdown":"### Citations do not guarantee clicks\n\nPew Research found that when an AI summary appeared on a Google results page, users clicked a traditional result in only 8% of visits versus 15% without one, and clicked a link inside the summary itself in just 1% of visits [16]. Being cited builds presence in the answer layer, but treating AEO as a traffic channel on par with classic organic search will disappoint. Measure brand mentions and citation share alongside referral visits.\n\n### The numbers age in months, not years\n\nChatGPT added 100 million weekly users in four months [3], and AI Mode went from launch to a billion monthly users in about a year [2]. Any platform ranking, including this one, is a snapshot, so re-verify reach figures each quarter before reallocating budget on top of them.\n\n### Attribution undercounts AI influence\n\nAssistants often mention brands without linking, and users who see a recommendation frequently navigate to the site on their own. After ChatGPT's May 2026 interface update, roughly 62 to 63% of its referral traffic landed on homepages [4], and much of the demand it creates arrives with no referrer at all. Standard last-click analytics will file that under direct traffic, so AI-driven demand routinely looks smaller than it is.\n\n### Blocking can happen by accident\n\nOAI-SearchBot, PerplexityBot, Claude-SearchBot, and their sibling agents are distinct user agents with distinct purposes [8][9][13]. An aggressive CDN bot rule, or a blanket robots.txt entry written to stop training crawlers, can also remove a site from search surfaces without anyone noticing. Audit robots.txt and firewall rules per agent, and keep the training decision separate from the visibility decision.","introHtml":"Pew Research found that when an AI summary appeared on a Google results page, users clicked a traditional result in only 8% of visits versus 15% without one, and clicked a link inside the summary itself in just 1% of visits [16]. Being cited builds presence in the answer layer, but treating AEO as a traffic channel on par with classic organic search will disappoint. Measure brand mentions and citation share alongside referral visits.
\nChatGPT added 100 million weekly users in four months [3], and AI Mode went from launch to a billion monthly users in about a year [2]. Any platform ranking, including this one, is a snapshot, so re-verify reach figures each quarter before reallocating budget on top of them.
\nAssistants often mention brands without linking, and users who see a recommendation frequently navigate to the site on their own. After ChatGPT's May 2026 interface update, roughly 62 to 63% of its referral traffic landed on homepages [4], and much of the demand it creates arrives with no referrer at all. Standard last-click analytics will file that under direct traffic, so AI-driven demand routinely looks smaller than it is.
\nOAI-SearchBot, PerplexityBot, Claude-SearchBot, and their sibling agents are distinct user agents with distinct purposes [8][9][13]. An aggressive CDN bot rule, or a blanket robots.txt entry written to stop training crawlers, can also remove a site from search surfaces without anyone noticing. Audit robots.txt and firewall rules per agent, and keep the training decision separate from the visibility decision.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":6},{"id":"b77ef47d-8af6-434d-9c27-1ac288ee448c","sectionKey":"what_it_is_not","sectionType":"markdown_section","heading":"What platform targeting is not","introMarkdown":"### It is not a separate program per platform\n\nGoogle's documentation says standard SEO fundamentals govern eligibility for its AI features [5], and the retrieval-based engines reward the same underlying quality: crawlable pages that answer questions directly and stay current. Targeting a platform mostly means verifying access and measuring presence there, not producing platform-specific content.\n\n### It is not a decision about model training\n\nWhether GPTBot or ClaudeBot may use your content for training is a commercial and legal question with its own controls [8][13]. Search visibility runs through different crawlers, and conflating the two can remove a site from answer engines unintentionally.\n\n### It is not permanent\n\nThe share shifts of the past year [4] would have upended any fixed platform list written in mid-2025. Prioritization is a quarterly review, not a set-and-forget strategy document.\n\n### It is not limited to the platforms in this answer\n\nNewer assistants keep arriving, and some will matter. Before adding one to the target list, apply the same test used throughout this answer by checking for verifiable reach among your buyers, a citation surface that credits external websites, and a documented way to influence what it retrieves. A platform that fails any part of that test cannot yet repay a content investment.","introHtml":"Google's documentation says standard SEO fundamentals govern eligibility for its AI features [5], and the retrieval-based engines reward the same underlying quality: crawlable pages that answer questions directly and stay current. Targeting a platform mostly means verifying access and measuring presence there, not producing platform-specific content.
\nWhether GPTBot or ClaudeBot may use your content for training is a commercial and legal question with its own controls [8][13]. Search visibility runs through different crawlers, and conflating the two can remove a site from answer engines unintentionally.
\nThe share shifts of the past year [4] would have upended any fixed platform list written in mid-2025. Prioritization is a quarterly review, not a set-and-forget strategy document.
\nNewer assistants keep arriving, and some will matter. Before adding one to the target list, apply the same test used throughout this answer by checking for verifiable reach among your buyers, a citation surface that credits external websites, and a documented way to influence what it retrieves. A platform that fails any part of that test cannot yet repay a content investment.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":null,"noteHtml":null,"sortOrder":7},{"id":"55231f82-0dfe-45d8-924d-4b69af0982df","sectionKey":"contributor_perspective","sectionType":"markdown_section","heading":"How this answer was researched","introMarkdown":"This answer was compiled from platform-published documentation and dated usage disclosures rather than from any vendor's marketing material. Every reach figure traces to a company statement, an earnings disclosure, or an independent measurement panel, and each carries its reporting date in the text because these numbers move quickly. Descriptions of crawler behavior come from the platforms' own bot documentation as published at the time of review in August 2026. No platform, agency, or tool vendor had input into the prioritization framework, and the ordering reflects reach and citation mechanics rather than any commercial arrangement. Readers who run AEO programs and can share measured citation or referral data across platforms, particularly from server logs rather than panel estimates, are invited to contribute corrections or additions through AnswerStack's contributor process. Claims that survive contact with practitioners' data make an answer like this one more durable.","introHtml":"This answer was compiled from platform-published documentation and dated usage disclosures rather than from any vendor's marketing material. Every reach figure traces to a company statement, an earnings disclosure, or an independent measurement panel, and each carries its reporting date in the text because these numbers move quickly. Descriptions of crawler behavior come from the platforms' own bot documentation as published at the time of review in August 2026. No platform, agency, or tool vendor had input into the prioritization framework, and the ordering reflects reach and citation mechanics rather than any commercial arrangement. Readers who run AEO programs and can share measured citation or referral data across platforms, particularly from server logs rather than panel estimates, are invited to contribute corrections or additions through AnswerStack's contributor process. Claims that survive contact with practitioners' data make an answer like this one more durable.
\n","outroMarkdown":null,"outroHtml":null,"contentJson":{},"configJson":{},"noteMarkdown":"This answer was written and reviewed by the AnswerStack Editorial Team, which has no commercial stake in the products, companies, or methods discussed. Every claim is cited inline and verified on the dates shown.","noteHtml":"This answer was written and reviewed by the AnswerStack Editorial Team, which has no commercial stake in the products, companies, or methods discussed. Every claim is cited inline and verified on the dates shown.
\n","sortOrder":8}],"citations":[{"title":"Google's AI Overviews reach over 2 billion monthly users","url":"https://digiday.com/media/googles-ai-overviews-reach-over-2-billion-monthly-users/","excerpt":"AI overviews now has over 2 billion monthly users across more than 200 countries and territories and 40 languages","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"AI Overviews reaching more than 2 billion monthly users, per Sundar Pichai on Google's July 2025 earnings call","domain":"digiday.com","publisherName":"Digiday"},{"title":"Google Search's I/O 2026 updates: AI agents and more","url":"https://blog.google/products-and-platforms/products/search/search-io-2026/","excerpt":"AI Mode has surpassed one billion monthly users, with queries more than doubling every quarter since launch","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"AI Mode surpassing 1 billion monthly users in May 2026, with queries more than doubling every quarter since launch","domain":"blog.google","publisherName":"Google"},{"title":"ChatGPT reaches 900M weekly active users","url":"https://techcrunch.com/2026/02/27/chatgpt-reaches-900m-weekly-active-users","excerpt":"ChatGPT has reached 900 million weekly active users, OpenAI announced Friday, putting the AI chatbot within striking distance of 1 billion.","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"ChatGPT reaching 900 million weekly active users in February 2026, up from 800 million in October 2025","domain":"techcrunch.com","publisherName":"TechCrunch"},{"title":"AI Search Stats 2026: Market Share, Referral, and Citation Data","url":"https://www.similarweb.com/blog/marketing/geo/gen-ai-stats/","excerpt":"ChatGPT's share of generative AI website visits fell from about 76% in June 2025 to roughly 53% by May 2026.","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"ChatGPT's share of generative AI visits falling from ~76% to ~53% (June 2025 to May 2026); Gemini climbing to ~27-28% and Claude to ~9% with the largest proportional gain; ChatGPT citation presence rising from ~1.6% to ~6.8% of US prompts; homepage referrals reaching ~62-63% after the May 2026 updat","domain":"similarweb.com","publisherName":"Similarweb"},{"title":"AI features and your website","url":"https://developers.google.com/search/docs/appearance/ai-features","excerpt":"There are no additional requirements to appear in AI Overviews or AI Mode, nor other special optimizations necessary.","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"No special optimization needed for AI Overviews or AI Mode; pages must be indexed and snippet-eligible; query fan-out mechanics; AI features displaying a wider, more diverse set of links; snippet controls","domain":"developers.google.com","publisherName":"Google Search Central"},{"title":"Google's Gemini app has surpassed 750M monthly active users","url":"https://techcrunch.com/2026/02/04/googles-gemini-app-has-surpassed-750m-monthly-active-users/","excerpt":"the Gemini App has grown to over 750 million monthly active users","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"Gemini app passing 750 million monthly active users, disclosed in Google's Q4 2025 earnings report on February 4, 2026","domain":"techcrunch.com","publisherName":"TechCrunch"},{"title":"Gemini Apps Privacy Hub","url":"https://support.google.com/gemini/answer/13594961","excerpt":"some Gemini responses are grounded on Search results","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"Only some Gemini responses being grounded on Google Search results","domain":"support.google.com","publisherName":"Google"},{"title":"OpenAI crawlers (GPTBot, OAI-SearchBot, ChatGPT-User)","url":"https://developers.openai.com/api/docs/bots","excerpt":"OAI-SearchBot is used to surface websites in search results in ChatGPT's search features.","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"OAI-SearchBot surfacing websites in ChatGPT search; GPTBot as the separate training crawler; ChatGPT-User fetching pages on user request","domain":"developers.openai.com","publisherName":"OpenAI"},{"title":"Perplexity crawlers (PerplexityBot, Perplexity-User)","url":"https://docs.perplexity.ai/guides/bots","excerpt":"PerplexityBot is designed to surface and link websites in search results on Perplexity. It is not used to crawl content for AI foundation models.","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"PerplexityBot surfacing and linking websites in Perplexity results rather than collecting training data; Perplexity-User fetching pages when users ask questions","domain":"docs.perplexity.ai","publisherName":"Perplexity"},{"title":"Perplexity AI Statistics (2026): Active Users & Revenue","url":"https://www.demandsage.com/perplexity-ai-statistics/","excerpt":"Perplexity AI has over 45 million monthly active users (MAUs)","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"Perplexity's 45+ million monthly active users and 780 million queries in May 2025","domain":"demandsage.com","publisherName":"DemandSage"},{"title":"Introducing Copilot Search in Bing","url":"https://blogs.bing.com/search/April-2025/Introducing-Copilot-Search-in-Bing","excerpt":"cites its sources prominently, so you know exactly where the information came from and can follow it for more context","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"Copilot Search blending traditional and generative search on Bing, citing sources prominently with inline links and a viewable list of links used","domain":"blogs.bing.com","publisherName":"Microsoft Bing Blog"},{"title":"Microsoft FY26 Q2 Results: 450 Million Microsoft 365 Seats","url":"https://office365itpros.com/2026/01/30/microsoft-fy26-q2-results/","excerpt":"160% year-over-year growth in seats","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"450 million paid Microsoft 365 seats; 15 million paid Microsoft 365 Copilot seats with 160% year-over-year growth; the 150 million Copilot MAU figure from October 2025 not being refreshed at the January 2026 earnings report","domain":"office365itpros.com","publisherName":"Office 365 for IT Pros"},{"title":"Does Anthropic crawl data from the web, and how can site owners block the crawler?","url":"https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler","excerpt":"prevents our system from indexing your content for search optimization, which may reduce your site's visibility and accuracy","quoteText":null,"sourceRole":"PRIMARY","verifiedAt":"2026-08-09T00:00:00","supportsText":"Anthropic's three crawlers: ClaudeBot for training, Claude-SearchBot for search indexing, Claude-User for user-directed retrieval, each with separate robots.txt controls","domain":"support.claude.com","publisherName":"Anthropic"},{"title":"Claude AI Statistics (2026): Active Users Data","url":"https://www.demandsage.com/claude-ai-statistics/","excerpt":"Claude AI now has over 245 million monthly active users across the web and the mobile app.","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"Claude's estimated 245 million monthly active users as of mid-2026 and roughly 45% of API calls originating from enterprise platforms","domain":"demandsage.com","publisherName":"DemandSage"},{"title":"Meta AI now has 1B monthly active users","url":"https://techcrunch.com/2025/05/29/meta-ai-now-has-1b-monthly-active-users/","excerpt":"Meta AI now has one billion monthly active users across its apps","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"Meta AI reaching 1 billion monthly active users across Meta's apps, announced by Mark Zuckerberg at the May 2025 shareholder meeting","domain":"techcrunch.com","publisherName":"TechCrunch"},{"title":"Google users are less likely to click on links when an AI summary appears in the results","url":"https://www.pewresearch.org/short-reads/2025/07/22/google-users-are-less-likely-to-click-on-links-when-an-ai-summary-appears-in-the-results/","excerpt":"Google users who encountered an AI summary clicked on a traditional search result link in 8% of all visits.","quoteText":null,"sourceRole":"INDEPENDENT","verifiedAt":"2026-08-09T00:00:00","supportsText":"Users clicking a traditional result in 8% of visits with an AI summary versus 15% without; links inside AI summaries clicked in 1% of visits","domain":"pewresearch.org","publisherName":"Pew Research Center"}],"revisions":[],"relatedAnswers":[{"id":"de717b06-01be-4de5-9285-bec6bebad067","slug":"biggest-aeo-mistakes-to-avoid","question":"What are the biggest AEO mistakes to avoid?","publishedAt":"2026-08-28T14:15:04.474","confidenceScore":87,"confidenceLabel":"High","industry":{"id":"70ea3802-1fc6-4fd7-a505-140d38d1c74a","slug":"digital-marketing","label":"Digital Marketing","description":"SEO, content, demand gen, and growth marketing"},"topic":{"slug":"answer-engine-optimization","label":"Answer Engine Optimization","description":"How B2B teams get content selected and cited by AI answer engines.","schemaKind":null},"contributor":{"id":"ec39deab-44fe-48d8-9029-fefe993ab85a","slug":"answer-stack","displayName":"AnswerStack","websiteUrl":null},"snippet":"Seven high-cost AEO mistakes, each with the evidence for why it hurts and the specific correction: chasing referral volume instead of buyer fit, blocking AI crawlers by accident at the robots.txt or CDN layer, mass-producing thin optimized pages, ignoring the third-party sources AI answers actually cite, running AEO apart from crawlability and indexing, publishing with no measurement baseline, and treating a page that earned a citation as permanently cited.","url":"/q/biggest-aeo-mistakes-to-avoid"},{"id":"e99a45a2-0ef5-45e5-bec8-f6d813825f8c","slug":"what-offsite-signals-matter-for-aeo","question":"What off-site signals matter for AEO?","publishedAt":"2026-08-26T14:15:07.644","confidenceScore":76,"confidenceLabel":"Medium","industry":{"id":"70ea3802-1fc6-4fd7-a505-140d38d1c74a","slug":"digital-marketing","label":"Digital Marketing","description":"SEO, content, demand gen, and growth marketing"},"topic":{"slug":"answer-engine-optimization","label":"Answer Engine Optimization","description":"How B2B teams get content selected and cited by AI answer engines.","schemaKind":null},"contributor":{"id":"ec39deab-44fe-48d8-9029-fefe993ab85a","slug":"answer-stack","displayName":"AnswerStack","websiteUrl":null},"snippet":"Branded mentions, review corpus, third-party comparisons, community threads, earned media, and entity consistency are the six off-site signals with published evidence behind them. The quality of that evidence is uneven: a little is documented platform behavior, some is buyer survey data, and most is correlation from companies selling AI visibility tools. This breaks down what each signal is actually supported by, how long it takes to move, and the order most teams should work through them.","url":"/q/what-offsite-signals-matter-for-aeo"},{"id":"051baa33-8c61-42b3-8763-ea8a0267f827","slug":"what-makes-ai-engines-recommend-a-brand","question":"What makes AI engines recommend one brand over another?","publishedAt":"2026-08-24T14:15:05.494","confidenceScore":82,"confidenceLabel":"High","industry":{"id":"70ea3802-1fc6-4fd7-a505-140d38d1c74a","slug":"digital-marketing","label":"Digital Marketing","description":"SEO, content, demand gen, and growth marketing"},"topic":{"slug":"answer-engine-optimization","label":"Answer Engine Optimization","description":"How B2B teams get content selected and cited by AI answer engines.","schemaKind":null},"contributor":{"id":"ec39deab-44fe-48d8-9029-fefe993ab85a","slug":"answer-stack","displayName":"AnswerStack","websiteUrl":null},"snippet":"A cross-platform evidence map of why ChatGPT, Gemini, Perplexity, and Google's AI answers surface one brand instead of another. It separates what platforms actually document (index eligibility, crawler access, organic shopping results) from what correlational studies suggest (mention volume, listicle presence, reviews, rankings, freshness), with effect sizes drawn from studies covering 680 million citations, 75,000 brands, and 1.4 million prompts, plus the volatility data showing why these drivers shift month to month.","url":"/q/what-makes-ai-engines-recommend-a-brand"},{"id":"027226b0-7f49-42e5-924e-5a870eef73d9","slug":"how-far-aeo-extends-into-buyer-journey","question":"How far does AEO extend into the buyer journey?","publishedAt":"2026-08-21T14:15:05.932","confidenceScore":85,"confidenceLabel":"High","industry":{"id":"70ea3802-1fc6-4fd7-a505-140d38d1c74a","slug":"digital-marketing","label":"Digital Marketing","description":"SEO, content, demand gen, and growth marketing"},"topic":{"slug":"answer-engine-optimization","label":"Answer Engine Optimization","description":"How B2B teams get content selected and cited by AI answer engines.","schemaKind":null},"contributor":{"id":"ec39deab-44fe-48d8-9029-fefe993ab85a","slug":"answer-stack","displayName":"AnswerStack","websiteUrl":null},"snippet":"AI assistants now answer questions at every stage of a purchase, from problem framing to checkout and returns. This answer maps the evidence stage by stage: what buyers ask assistants at each point, which sources answer engines actually cite as the journey progresses, and the content each stage requires, using verified 2025-2026 data from Forrester, Bain, G2, Salesforce, Semrush, Ahrefs, xfunnel, and platform documentation from Google, OpenAI, and Stripe.","url":"/q/how-far-aeo-extends-into-buyer-journey"}],"contributorStats":{"verifiedAnswers":269,"openDisputes":0},"schemaJson":{"@context":"https://schema.org","@type":"Question","name":"Which AI platforms should an AEO strategy target?","text":"Which AI platforms should an AEO strategy target?","url":"https://www.answerstack.io/q/which-ai-platforms-should-aeo-target","answerCount":1,"datePublished":"2026-08-19T14:15:05.417","author":{"@type":"Person","name":"AnswerStack Editorial Team","worksFor":{"@type":"Organization","name":"AnswerStack"},"url":"https://www.answerstack.io/contributors/answer-stack"},"about":[{"@type":"Thing","name":"Answer Engine Optimization"},{"@type":"Thing","name":"Digital Marketing"}],"acceptedAnswer":{"@type":"Answer","text":"An AEO strategy should target Google's answer surfaces and ChatGPT first, then add platforms by audience fit. Google's AI Overviews reach more than 2 billion monthly users [1], AI Mode passed 1 billion monthly users in May 2026 [2], and ChatGPT reached 900 million weekly active users in February 2026 [3], which puts most of the world's answer-engine activity on those two ecosystems. The second tier depends on who buys from you: Perplexity for research-heavy audiences because its product links the websites behind its answers [9], Microsoft Copilot for enterprise buyers inside the 450-million-seat Microsoft 365 installed base [12], and Claude for technical and professional audiences as the fastest-growing major assistant [4]. Meta AI's 1 billion monthly users sit inside social and messaging apps with little cited-answer surface, which makes it a platform to monitor rather than target [15].","url":"https://www.answerstack.io/q/which-ai-platforms-should-aeo-target","upvoteCount":0,"datePublished":"2026-08-19T14:15:05.417","dateModified":"2026-08-09T00:00:00","author":{"@type":"Person","name":"AnswerStack Editorial Team","worksFor":{"@type":"Organization","name":"AnswerStack"},"url":"https://www.answerstack.io/contributors/answer-stack"},"citation":[{"@type":"CreativeWork","name":"Google's AI Overviews reach over 2 billion monthly users","url":"https://digiday.com/media/googles-ai-overviews-reach-over-2-billion-monthly-users/"},{"@type":"CreativeWork","name":"Google Search's I/O 2026 updates: AI agents and more","url":"https://blog.google/products-and-platforms/products/search/search-io-2026/"},{"@type":"CreativeWork","name":"ChatGPT reaches 900M weekly active users","url":"https://techcrunch.com/2026/02/27/chatgpt-reaches-900m-weekly-active-users"},{"@type":"CreativeWork","name":"AI Search Stats 2026: Market Share, Referral, and Citation Data","url":"https://www.similarweb.com/blog/marketing/geo/gen-ai-stats/"},{"@type":"CreativeWork","name":"AI features and your website","url":"https://developers.google.com/search/docs/appearance/ai-features"},{"@type":"CreativeWork","name":"Google's Gemini app has surpassed 750M monthly active users","url":"https://techcrunch.com/2026/02/04/googles-gemini-app-has-surpassed-750m-monthly-active-users/"},{"@type":"CreativeWork","name":"Gemini Apps Privacy Hub","url":"https://support.google.com/gemini/answer/13594961"},{"@type":"CreativeWork","name":"OpenAI crawlers (GPTBot, OAI-SearchBot, ChatGPT-User)","url":"https://developers.openai.com/api/docs/bots"},{"@type":"CreativeWork","name":"Perplexity crawlers (PerplexityBot, Perplexity-User)","url":"https://docs.perplexity.ai/guides/bots"},{"@type":"CreativeWork","name":"Perplexity AI Statistics (2026): Active Users & Revenue","url":"https://www.demandsage.com/perplexity-ai-statistics/"},{"@type":"CreativeWork","name":"Introducing Copilot Search in Bing","url":"https://blogs.bing.com/search/April-2025/Introducing-Copilot-Search-in-Bing"},{"@type":"CreativeWork","name":"Microsoft FY26 Q2 Results: 450 Million Microsoft 365 Seats","url":"https://office365itpros.com/2026/01/30/microsoft-fy26-q2-results/"},{"@type":"CreativeWork","name":"Does Anthropic crawl data from the web, and how can site owners block the crawler?","url":"https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler"},{"@type":"CreativeWork","name":"Claude AI Statistics (2026): Active Users Data","url":"https://www.demandsage.com/claude-ai-statistics/"},{"@type":"CreativeWork","name":"Meta AI now has 1B monthly active users","url":"https://techcrunch.com/2025/05/29/meta-ai-now-has-1b-monthly-active-users/"},{"@type":"CreativeWork","name":"Google users are less likely to click on links when an AI summary appears in the results","url":"https://www.pewresearch.org/short-reads/2025/07/22/google-users-are-less-likely-to-click-on-links-when-an-ai-summary-appears-in-the-results/"}]}}}