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AI Crawlers Explained: GPTBot, ClaudeBot, and More

Learn what AI crawlers do, how robots.txt controls access, and why allowing a crawler does not automatically guarantee AI search visibility or citations.

AI crawlers are automated agents that access public web pages for different purposes, including model training, search indexing, or user-requested retrieval. Their names and roles are not identical, so do not treat every crawler as interchangeable.

Common AI-related crawlers

GPTBot

OpenAI describes GPTBot as a crawler used to collect content that may be used to improve its foundation models. Its access can be controlled through robots.txt rules.

ClaudeBot

ClaudeBot is associated with Anthropic’s model-training crawl activity. Anthropic also documents separate crawler identities for search and user-triggered retrieval, so one Claude-related user agent should not automatically be assumed to represent all Claude access.

PerplexityBot

PerplexityBot is associated with Perplexity’s search crawling. Perplexity may also use separate user-triggered fetching behavior, so robots.txt results should be interpreted carefully.

Google-Extended

Google-Extended is a control token for Google’s generative AI model training and related use. It is separate from Googlebot, so blocking Google-Extended is not the same as blocking normal Google Search crawling.

How robots.txt works

robots.txt is a set of crawl instructions placed at the root of your domain, usually at /robots.txt. It can allow or disallow paths for specified user-agent names.

User-agent: GPTBot
Allow: /

User-agent: ClaudeBot
Allow: /

User-agent: PerplexityBot
Allow: /

User-agent: Google-Extended
Allow: /

User-agent: *
Disallow: /admin/
Disallow: /dashboard/

The example above is only a starting point. Review your own privacy, licensing, security, and content-distribution requirements before allowing or blocking a crawler.

Allowing a crawler does not guarantee a citation

robots.txt controls whether a crawler is instructed to access certain content. It does not guarantee that a page will be indexed, selected for retrieval, cited in an answer, or recommended to a user.

AI visibility also depends on page quality, relevance, indexing, content structure, trust signals, and the behavior of the platform generating the answer.

Practical checks

  • Confirm that robots.txt is available at your domain root.
  • Check that important public content is not accidentally blocked.
  • Keep private, admin, staging, and account areas restricted.
  • Review noindex, authentication, WAF, and rate-limit settings.
  • Check server logs if you need to confirm real crawler activity.
  • Re-check rules after redesigns, migrations, or hosting changes.

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