What is… · updated 2026-08-17

What is an AI crawler?

An AI crawler is an automated bot — like GPTBot, ClaudeBot or PerplexityBot — that reads public web pages so an AI assistant can describe or recommend them later. It is separate from Googlebot: allowing Google does not allow AI crawlers, and many websites block them without realising it.

1

Which AI crawlers actually matter?

A handful do most of the work. Each belongs to a different company, and each has to be allowed separately — there is no single switch that covers them all.

  • GPTBot (OpenAI) — reads pages so ChatGPT knows about them.
  • OAI-SearchBot (OpenAI) — powers ChatGPT's search results specifically.
  • ClaudeBot (Anthropic) — Claude's crawler.
  • PerplexityBot (Perplexity) — Perplexity cites sources heavily, so this one carries unusual weight.
  • Google-Extended (Google) — controls whether your content feeds Gemini and Google's AI answers. Note this is a permission token, not a separate crawler: Googlebot does the actual fetching.
  • CCBot (Common Crawl) — a public dataset that many AI models are trained from.
2

How is an AI crawler different from Googlebot?

Googlebot exists to build a list of links. An AI crawler exists to build an answer. That difference has two practical consequences.

First, permissions are separate. A site can be perfectly visible in Google search and completely invisible to ChatGPT, because the two are governed by different rules.

Second, JavaScript matters more. Googlebot will usually render your page and wait for JavaScript to run. Most AI crawlers largely read the raw HTML your server returns. If your content is assembled in the browser — common on sites built with Lovable, Bolt, v0 and similar tools — a human sees a full page and an AI crawler sees an almost empty one.

3

Why would my site be blocking AI crawlers?

Usually because someone else decided for you. Since 2025 most CDNs block AI crawlers by default on new setups — Cloudflare in particular — and that block happens in front of your site, before any request reaches your own configuration.

This is the part that catches people out: your robots.txt can explicitly welcome AI crawlers while your firewall turns every one of them away. Nothing on your website tells you it is happening. The only way to know is to make a request as each crawler and look at what comes back.

4

Should I allow AI crawlers?

It depends on how you make money, and it is a genuine choice rather than an obvious one.

If you sell a product or a service, allowing them is usually right — being the business an AI assistant names is quickly becoming as valuable as ranking on Google.

If your content *is* the product — journalism, research, paid courses — blocking or charging is a legitimate position, and many large publishers have taken it. What you want to avoid is the third case: blocking by accident, because a default was set for you and nobody checked.

5

Common questions

Does allowing Googlebot also allow AI crawlers?

No. They are governed separately. A site can rank perfectly well in Google search and still be completely invisible to ChatGPT, Claude and Perplexity.

How do I check if AI crawlers can read my site?

Request your homepage while identifying as each crawler and compare the response to a normal browser request. If the browser gets a page and the crawler gets a 403, something is blocking it. Scanvify's full report runs this test for you against every major AI crawler and tells you which setting to change.

Will blocking AI crawlers hurt my Google ranking?

Blocking AI-specific crawlers like GPTBot or ClaudeBot does not affect classic Google rankings, which depend on Googlebot. But a blanket block that also catches Googlebot absolutely will — which is a common and expensive mistake.

Is blocking AI crawlers the same as blocking AI training?

Not quite. Some crawlers gather training data, others fetch pages live to answer a question someone is asking right now. Cloudflare now separates these by purpose — Search, Agent and Training — so you can allow the ones that send you customers while blocking the ones that only take content.

Check this on your own site

Get a free Launch Score for your site in under a minute — no signup. The full report tests whether each AI crawler can actually reach you, and tells you exactly what to change if it can't.

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Related: What is GPTBot? · What is AEO? · What is llms.txt?

What is an AI crawler? · Scanvify