Last updated: August 17, 2026
AI crawlers are automated bots operated by AI companies to discover or fetch web content. Their roles differ: some support model training, some build search indexes, and others retrieve pages in response to a user request.
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How AI Crawlers Work
AI crawlers function similarly to conventional web crawlers: they follow links, parse HTML, and process content for later use. Their purposes differ. Some collect content that may contribute to model training, some build search indexes, and others retrieve pages at a user’s direction.
Each major AI company operates its own crawler with a distinct user-agent string. The most widely recognized include:
- GPTBot: operated by OpenAI for content that may be used in model training
- OAI-SearchBot: operated by OpenAI for ChatGPT search discovery
- ChatGPT-User: used for user-triggered actions, not automatic crawling or Search inclusion
- ClaudeBot: operated by Anthropic for content that may contribute to model training
- Claude-SearchBot: operated by Anthropic for Claude search indexing and quality
- Claude-User: used when Claude retrieves content at a user’s direction
- PerplexityBot: operated by Perplexity for search discovery and linking
- Perplexity-User: used for user-triggered retrieval and generally does not follow robots.txt
- Google-Extended: a robots.txt control token for training future Gemini models and grounding some Gemini products, not a separate crawler user agent
- Bytespider: operated by ByteDance for AI applications
As of early 2026, Originality.ai research shows that over 35% of the top 1,000 websites now block at least one major AI crawler via robots.txt, up from under 10% in 2023.
Managing AI Crawler Access
Website owners often manage crawler access through their robots.txt file, but controls vary by provider. Google is also testing a separate Search generative AI control in Search Console with a subset of site owners. It manages whether a site can appear in AI Overviews, AI Mode, and generative AI features in Discover. Blocking a search crawler can reduce eligibility for citations, while blocking a training crawler does not necessarily remove a page from that company’s search product.
The choice is not all or nothing. A site can block training crawlers while allowing search crawlers, and user-triggered fetchers may follow different robots.txt behavior. Review each provider’s documented roles before setting access rules.
Best Practices for AI Crawler Management
Rather than taking an all-or-nothing approach to AI crawlers, effective brands adopt a selective strategy. The first step is to audit which AI crawlers are currently accessing your site by reviewing server logs or using a crawlability checker. Many brands discover that bots they intended to allow are actually blocked by overly broad robots.txt rules inherited from years of traditional SEO configuration.
Once you have visibility into current crawler activity, apply a tiered access policy. Allow search crawlers tied to platforms where you want AI visibility, such as OAI-SearchBot for ChatGPT, while managing training controls such as GPTBot separately if you prefer to limit how your content is used in model training. For sites with gated or premium content, consider allowing AI crawlers to access marketing pages and public documentation while blocking proprietary research or subscriber-only sections. This preserves the commercial value of gated content while still feeding AI systems enough brand context to generate accurate recommendations. Review your crawler policy quarterly, since new AI bots emerge regularly and platform crawling behavior evolves as these companies expand their retrieval capabilities.
Why AI Crawlers Matter for SEO
AI crawlers represent a fundamental shift in how content gets discovered and surfaced online. With Gartner projecting that AI-driven search will account for a growing share of organic traffic by 2027, ensuring your site is accessible to the right AI crawlers has become a strategic decision.
Tools like the LLM Pulse AI Crawler Index help brands identify AI bots and understand their documented roles. The GEO Crawlability Checker lets you verify whether your site is accessible to specific AI crawlers across different regions. Crawlability is an eligibility signal, not a guarantee that an AI product will cite or mention a page.
