What is AI Crawler?
Bots operated by AI companies — GPTBot, ClaudeBot, PerplexityBot, Google-Extended — that fetch web content for model training or live answer retrieval.
Definition
An AI crawler is a bot operated by an AI company to fetch web content. The major ones include OpenAI's GPTBot (training) and OAI-SearchBot (live search), Anthropic's ClaudeBot, PerplexityBot, Google-Extended (Gemini training), and Google-CloudVertexBot. They differ from classic search crawlers in purpose: some collect training data, others retrieve pages in real time to ground an answer.
Each announces itself via a user-agent string and (usually) respects robots.txt directives, letting site owners allow or block each bot individually.
Why it matters
If AI crawlers can't fetch your pages, you can't be cited — retrieval-based assistants simply won't see you. Blocking GPTBot or ClaudeBot in robots.txt (something many sites did by default via CDN settings) silently removes you from AI answers. Most AI crawlers also don't execute JavaScript, so content that only renders client-side is invisible to them.
Frequently asked
Should I block AI crawlers?
It's a trade-off. Blocking training bots protects content from model training but blocking search/retrieval bots (OAI-SearchBot, PerplexityBot) removes you from AI answers — the fastest-converting referral channel measured in 2026. Most brands now allow retrieval bots and decide per-policy on training bots.
How do I see AI crawler traffic?
Standard analytics won't show it — bots don't run JavaScript. Check server logs or CDN dashboards (e.g., Cloudflare) for user-agents like GPTBot, ClaudeBot, and PerplexityBot.
Related terms
- AI OverviewsGoogle's AI-generated summaries shown above traditional results, now appearing on roughly half of searches and dramatically reducing clicks to websites.
- AI Search VisibilityHow often and how prominently a brand appears in answers generated by AI assistants like ChatGPT, Gemini, Perplexity, and Google AI Overviews.
- Answer Engine Optimization (AEO)The practice of structuring content so that answer engines — AI assistants and featured-snippet systems — extract and present it as the direct answer.
- AI CitationsThe linked sources an AI assistant credits when generating an answer. Being cited is the AI-era equivalent of ranking #1.