Should Websites Allow AI Search Crawlers?

Websites to make nuanced decisions about AI search crawlers rather than blocking or allowing them all indiscriminately. It distinguishes between crawlers used for search indexing, real-time AI answers, and AI training, recommending separate policies for each, such as allowing OpenAI's OAI-SearchBot for ChatGPT visibility while blocking GPTBot for training. The piece warns that blocking all AI crawlers reduces visibility in AI-generated answers, while allowing them risks "summary substitution," where AI uses content without sending traffic, citing a Pew study showing clicks drop from 15% to 8% when AI summaries appear.

Should websites allow AI search crawlers? Not blindly. Blocking every AI crawler can protect content from some forms of reuse, but it can also make a site less visible in AI answers, citations, and assistant workflows. Allowing every AI crawler can increase exposure, but it can also let AI systems summarize the content without sending traffic back. The better question is: Which crawler should be allowed, for which purpose, on which content? That matters because "AI crawler" is not one category. A crawler may be used for: Those are different use cases. Cloudflare's managed robots.txt documentation uses a helpful split: search, ai-input, and ai-train. Search means building an index and returning links or short excerpts. Ai-input means using content for real-time generative answers, grounding, or retrieval augmented generation. Ai-train means using content for training or fine-tuning models. That is the right mental model. Do not treat all crawling as the same act. OpenAI separates search visibility from training in its crawler documentation. OAI-SearchBot is used for ChatGPT search features. OpenAI says sites that opt out of OAI-SearchBot will not be shown in ChatGPT search answers, though they may still appear as navigational links. GPTBot is different. It is used for content that may be used in training OpenAI's generative AI foundation models. A site might choose: User-agent: OAI-SearchBot Allow: / User-agent: GPTBot Disallow: / That means: This is not universal advice. It is a policy pattern. A public documentation site, a SaaS marketing site, a media company, and a paid research database may all choose differently. The important point is that search and training should be separate decisions. Googlebot is used for normal Google Search discovery and indexing. Blocking Googlebot can hurt Google Search visibility. Google-Extended is a separate robots.txt product token. Google says it can be used to manage whether content Google crawls may be used for certain Gemini training and grounding uses. Google also says Google-Extended does not affect inclusion in Google Search and is not used as a Search ranking signal. A basic split might be: User-agent: Googlebot Allow: / User-agent: Google-Extended Disallow: / But Google-Extended is not a full opt-out from every Google AI feature. Google has said it is exploring more specific controls for Search generative AI features in its website controls update. So do not block Googlebot if search visibility matters. And do not treat Google-Extended as a universal AI switch. robots.txt is useful for compliant crawlers. Google's robots.txt documentation explains that crawlers use the most specific matching user-agent group. If the file is messy, a crawler may follow a different group than the one you expected. A useful robots.txt review should ask: robots.txt is not: Private or premium content needs stronger controls such as authentication, paywalls, network rules, and licensing terms. If AI search systems cannot access your content, they may not mention it, cite it, or use it in answers. That matters for: AIvsRank's AI Crawler Access Checker can help diagnose whether important pages are reachable. Its guide on how to optimize for AI search engines explains the broader workflow: access, eligibility, extractability, citation readiness, visibility, and measurement. Access is only the first step. A page also needs to be clear, current, credible, internally linked, and easy to cite. The main risk is summary substitution. AI systems can use your content to answer the user's question without sending the user to your page. Pew Research Center found that Google users clicked a traditional result in 8% of visits when an AI summary appeared, compared with 15% without one. Links inside AI summaries were clicked in only 1% of visits to pages with such summaries, according to Pew's analysis. So the tradeoff is real: AIvsRank's article on how AI search rewrites information is relevant because the issue is not only ranking. It is also attribution, framing, and representation. For valuable content, crawler rules are not enough. Cloudflare Content Signals can express preferences such as: Content-signal: search=yes, ai-input=no, ai-train=no The RSL specification also defines a machine-readable way to express usage, licensing, payment, and legal terms for digital assets. Not every crawler will honor every signal. But the direction is clear: websites need to express not only who can crawl, but what the content can be used for. robots.txt answers one question: Who may crawl? Licensing answers another: What may the content be used for? Both questions matter now. There is no universal robots.txt file for AI crawlers. The right policy depends on the site. Examples: Default posture: For these sites, total blocking can make the brand invisible in AI answer surfaces. Examples: Default posture: For these sites, the risk is giving away the answer while losing the subscription, ad impression, lead, or licensing value. Examples: Default posture: Communities have an extra issue: the content comes from users. Crawler policy is not only an SEO decision. These are starting points, not universal rules. User-agent: OAI-SearchBot Allow: / User-agent: GPTBot Disallow: / User-agent: Googlebot Allow: / User-agent: Google-Extended Disallow: / This supports ChatGPT search visibility through OAI-SearchBot while blocking GPTBot training use. It also keeps Googlebot open for Search while opting out of Google-Extended uses described by Google. User-agent: Disallow: /members/ Disallow: /premium/ Disallow: /internal/ Allow: / For truly private content, do not rely only on robots.txt. Use authentication. User-agent: Content-signal: search=yes, ai-input=no, ai-train=no Allow: / This is an additional policy signal. It is not a replacement for normal allow and disallow rules. Do not update robots.txt and walk away. Track: The goal is to learn which layer is working. If the crawler is blocked, the page cannot be used. If the crawler can access the page but the page is not cited, the problem may be content structure or authority. If the page is cited but the user does not click, the problem may be summary substitution. If the page is cited incorrectly, the problem is representation. AIvsRank's AI visibility leaderboard can help with category-level visibility, while the free tools hub can help with specific access and eligibility checks. For recurring monitoring, AIvsRank features and AIvsRank Docs can help turn one-off checks into a workflow. For many public websites, a reasonable default is: The goal is not to be fully open or fully closed. The goal is to make crawler access match the value exchange you are willing to accept. Usually no. Blocking everything can reduce AI answer visibility. Selective access is often better. If ChatGPT search visibility matters, allowing OAI-SearchBot may make sense. If you do not want content used for OpenAI foundation model training, blocking GPTBot is a common choice. No. Google says Google-Extended does not affect inclusion in Google Search and is not used as a Search ranking signal. No. Use authentication, paywalls, network rules, and licensing terms for premium or private content. The biggest risk is summary substitution: the AI system may use your content to answer the user without sending the user to your site. The biggest risk is invisibility in AI answer surfaces.