Quick Answer: AI crawlers like GPTBot, ClaudeBot, PerplexityBot, and Google-Extended fetch your pages similarly to traditional search crawlers, but with smaller crawl budgets and stricter time limits. They prefer server-rendered HTML, valid structured data, and well-organized sites with llms.txt files. Many sites accidentally block or rate-limit AI crawlers and lose AEO citations as a result.

Understanding how AI crawlers actually behave is fundamental to running an effective AEO program. This article explains what each major AI crawler does, how they differ from traditional search crawlers, and the technical optimizations that consistently improve AI crawl outcomes.

Which AI crawlers should I care about?

  • GPTBot — OpenAI's general-purpose web crawler. Fetches content used to train and ground GPT models.
  • OAI-SearchBot — OpenAI's ChatGPT Search-specific crawler. Fetches content for real-time search responses.
  • ChatGPT-User — Used when a ChatGPT user requests live web access during a conversation.
  • ClaudeBot / anthropic-ai — Anthropic's crawlers for Claude.
  • PerplexityBot — Perplexity's primary crawler.
  • Google-Extended — Controls whether Google can use your content for AI features (Bard, AI Overviews).
  • CCBot — Common Crawl, used by many AI training pipelines.
  • Applebot-Extended — Apple's crawler for AI features.
  • meta-externalagent — Meta's crawler for AI features.

How are AI crawlers different from search crawlers?

Three differences matter most:

  • AI crawlers have smaller crawl budgets per site than Googlebot. They cannot fully crawl large sites; they need help prioritizing.
  • AI crawlers are more sensitive to JavaScript rendering. Many do not execute JS at all or execute it conservatively. Server-rendered HTML is strongly preferred.
  • AI crawlers are more aggressively blocked by bot protection systems (Cloudflare, Akamai). Many sites accidentally block AI crawlers via overly restrictive bot rules.

How do I make my site easy for AI crawlers?

  1. Render core content server-side or in plain HTML.
  2. Allow all major AI crawlers in robots.txt.
  3. Audit your bot protection (Cloudflare, etc.) for accidental AI crawler blocks.
  4. Deploy llms.txt to help AI crawlers prioritize your most important content.
  5. Maintain a clean, valid sitemap.xml.
  6. Ensure fast page load times (under 2.5 seconds).
  7. Return clean 200 status codes for important pages.
  8. Keep important content text-based (not image-only or JS-rendered-only).

How do I see what AI crawlers are doing on my site?

Check your server logs. Filter by user agent for GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and the others above. You will see fetch frequency, status codes returned, and which URLs each crawler is interested in. CDNs like Cloudflare and Fastly also expose AI crawler analytics in their dashboards.

For technical AEO specialists who can audit and optimize AI crawler accessibility, see our LLMs.txt Implementation category.