Definition
AI Crawlers
AI crawlers are automated bots that AI companies use to read web pages for training and for live answers. Examples include OpenAI's GPTBot and OAI-SearchBot, PerplexityBot, Google-Extended, and ClaudeBot. If your robots.txt or firewall blocks them, you can be left out of AI answers, since an engine cannot cite a page it never fetched.
What AI crawlers are and which matter
AI crawlers are the bots that AI systems use to fetch web content, either to build training data or to retrieve pages live when answering a question. They behave like traditional search crawlers but serve AI features. As of 2026 the notable ones include OpenAI's GPTBot for general crawling and OAI-SearchBot for citations and links in ChatGPT search, PerplexityBot and Perplexity-User, Google-Extended (a control for Gemini and AI training, separate from Googlebot), and Anthropic's ClaudeBot. Each engine documents its own user-agent names, and they change, so the reliable move is to check the official docs rather than trust a static list. Some agents crawl ahead of time while others fetch at the moment of the answer, which is why access, not just past indexing, decides whether you can appear.
Why blocking them quietly costs you
Many sites block AI crawlers without realizing it. A security plugin, a CDN bot-management setting, or a copied robots.txt rule can disallow GPTBot or PerplexityBot by default, and the page then simply never enters the AI's view. Because an engine cannot cite or describe a page it could not read, a well-meaning block can remove you from answers your competitors still appear in. This is one of the most common and most invisible AI-visibility defects, since nothing breaks visibly on your own site. There is a real tension worth naming: blocking AI crawlers is also how some publishers protect content from training. That is a legitimate choice, but it should be deliberate, made per agent, not an accident of a default setting.
How to check and decide
Start by reading your own robots.txt and any bot rules in your CDN or security tools, then decide, per crawler, who you want to allow. If your goal is to be found and cited in AI search, allow the search and answer agents such as OAI-SearchBot and PerplexityBot, and confirm nothing upstream overrides that. If you also want to limit training use, you can allow answer-time agents while disallowing training crawlers, since they are often separate user-agents. Recheck periodically, because agent names and behavior shift. Laudia checks whether a site welcomes the AI crawlers its own scoring recognizes and flags a block as a high-value, fixable gap, because an accidental disallow is one of the clearest reasons a brand is absent from AI answers.