How AI Crawlers Work in 2026: GPTBot, ClaudeBot, PerplexityBot, Google-Extended

How AI Crawlers Work: The Bot-by-Bot ReferenceThe major bots and what they doThe right policy for most service businessesIf you are a service business and your goal is citation: allow everything. There is no business model in blocking — citations drive brand, brand drives leads.If you are a publisher monetizing content directly: typical policy is allow live-retrieval bots (OAI-SearchBot, Google-Extended for AI Overviews, PerplexityBot), block training-only bots (GPTBot, ClaudeBot, CCBot). This lets you be cited in real-time answers while preserving content for paid licensing deals.Whatever you choose, document the policy and revisit quarterly. The bot landscape is shifting fast.Common silent-block patterns to fixFrequently asked questionsDoes blocking a training bot remove my content from already-trained models?No. Blocking GPTBot today does nothing about content that was already trained on. It only affects future model versions.Should I use the noai or noimageai meta tags?Some publishers do, but adoption by AI engines is inconsistent. Robots.txt is the more reliable signal.How do I verify my robots.txt is configured correctly?Use Google's robots.txt tester for Google bots, manually test for the others. Our AI Citability Checker also tests for known AI-bot blocks.Are there legal frameworks emerging around AI training bots?Yes — the EU AI Act includes provisions on training transparency. As of April 2026, no jurisdiction has mandated bot-policy formats, but expect regulation in 2026-2027.