AI Crawler
What is AI Crawler?
An AI crawler is a bot deployed by AI companies to scan, index, and ingest web content for training data or real-time retrieval. GPTBot, ClaudeBot, Google-Extended: these are how AI models discover and access your content.
How they work
AI crawlers function like search engine crawlers but serve different purposes. They scan web pages to collect content for:
- Pre-training data: building the model's base knowledge
- Fine-tuning: improving model performance on specific domains
- Real-time retrieval: RAG systems that fetch current content
Each AI company runs its own crawler with its own behavior, rate limits, and robots.txt directives:
| Crawler | Company | Purpose |
|---|---|---|
| GPTBot | OpenAI | Training + browsing |
| ClaudeBot | Anthropic | Training data |
| Google-Extended | AI features (Gemini, AI Overviews) | |
| PerplexityBot | Perplexity | Real-time search retrieval |
Robots.txt and AI access
Your robots.txt controls which AI crawlers can reach your content. Many sites accidentally block AI crawlers through:
- Overly restrictive blanket rules (
User-agent: * / Disallow: /) - Not explicitly allowing newer AI bots
- CMS default settings that block unknown crawlers
- CDN or firewall rules that rate-limit or block bot traffic
A site audit should verify that major AI crawlers have access to your content pages. This is table stakes. If crawlers can't reach your content, nothing else in your GEO strategy matters.
Making your content crawl-friendly
Beyond allowing access, optimize for AI crawler efficiency:
- Clean HTML structure: semantic elements (
<article>,<section>,<h1>-<h6>) - Schema.org markup: JSON-LD structured data AI systems can parse directly
- Fast page loads: slow pages may not get fully crawled
- Clear content hierarchy: headings and sections that map to topic structure
- Minimal JavaScript rendering: content available in initial HTML, not behind JS execution
- XML sitemap: include all content pages you want AI to discover
These technical basics make your content easier for AI systems to parse, understand, and reference in their responses. Prompt Metrics tracks whether AI models are actually discovering and citing your content.
Frequently Asked Questions
Blocking them prevents your content from being used in AI training and retrieval, which means AI models won't reference or recommend your brand. For most businesses seeking AI visibility, you want them crawling your site. Block only if you have specific IP protection concerns.
GPTBot (OpenAI), ClaudeBot (Anthropic), Google-Extended (Google AI), and PerplexityBot (Perplexity) are the main ones. Allow all of them unless you have a specific reason not to. Check your robots.txt to make sure none are inadvertently blocked.
Check your robots.txt file for User-agent: GPTBot, User-agent: ClaudeBot, User-agent: Google-Extended, and User-agent: PerplexityBot. If any are set to Disallow: /, those crawlers can't access your content. Also check for overly broad Disallow rules that might block them unintentionally.
The major AI companies (OpenAI, Anthropic, Google, and Perplexity) have committed to respecting robots.txt directives. However, enforcement varies and smaller AI companies may not always comply. Structured data provides an additional layer of control over how your content is used.