What Are AI Crawlers?
AI crawlers are the bots that fetch web pages for AI companies — to train models, to retrieve fresh content at answer time, and to follow links a user clicks inside a chat.
Definition
An AI crawler is an automated fetcher operated by an AI provider. The well-known names include OpenAI's GPTBot (training), OAI-SearchBot (search indexing) and ChatGPT-User (live fetch when a user's chat needs a page); Anthropic's ClaudeBot; PerplexityBot and Perplexity-User; Google's Google-Extended control for AI training; Applebot-Extended; and Meta's Meta-ExternalAgent. You grant or refuse each of them in robots.txt, and you can watch them arrive in your server logs.
Why it matters
Every AI answer about your category starts with a crawl. If your robots.txt blocks retrieval-oriented bots, your pages cannot be quoted at answer time — you have opted out of the channel without knowing it. The reverse also happens: site owners copy a "block all AI" snippet to protect their content, then wonder why competitors keep getting cited. The crawler layer is the first gate of AI visibility, and it is the one fully under your control.
What to do about it
- Audit your robots.txt: know exactly which AI bots you allow and which you block, and why.
- Split policy by purpose — retrieval and user-triggered fetchers drive visibility; bulk training crawlers are a licensing question.
- Check server logs monthly for GPTBot, ClaudeBot, PerplexityBot; no visits means no pipeline.
- Do not block what you want to appear in: a blocked bot cannot cite you.
Frequently asked questions
Should I block AI crawlers?
It is a trade-off. Blocking training crawlers protects content from being absorbed into models, but blocking search- and retrieval-oriented bots removes you from the answers buyers read. Many brands split the difference: allow retrieval and user-triggered fetch bots, restrict bulk training crawlers. Decide per bot, not with one blanket rule.
AI crawler vs search engine crawler?
Googlebot indexes pages so Google can rank links. AI crawlers feed two other pipelines: model training (long-term knowledge) and live retrieval (fetching pages at answer time). A page can rank in Google yet be invisible to AI answers if retrieval bots are blocked — and vice versa.
Can the bots even reach you?
Our free check reads your robots.txt and llms.txt as part of the technical signals — run it in about a minute.
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