Key Takeaways
- 1AI crawler traffic grew over 305% in 2024 according to Cloudflare network data
- 2Major AI crawlers: GPTBot (OpenAI), Google-Extended, ClaudeBot (Anthropic), PerplexityBot
- 3Blocking AI crawlers prevents your content from being used in AI answers: a trade-off between control and visibility
- 4robots.txt is the primary mechanism for controlling AI crawler access
AI crawlers are automated bots deployed by AI companies to read and collect website content. They serve two distinct purposes:
- 1Training crawlers: collect data to train and fine-tune AI models (e.g., GPTBot for OpenAI's models)
- 2Retrieval/search crawlers: fetch real-time content for AI-powered search answers (e.g., ChatGPT-User for live web search, PerplexityBot for Perplexity answers)
Cloudflare's 2025 data reveals the scale of this shift: AI crawler traffic grew over 305% year-over-year, with Googlebot still leading overall crawl volume but AI-specific bots rapidly closing the gap. The "crawl-to-click gap" is a growing concern: AI bots consume vast amounts of content while sending far fewer users back to source websites compared to traditional search.
The major AI crawlers include:
| Bot | Company | Purpose |
|---|---|---|
| GPTBot | OpenAI | Model training |
| ChatGPT-User | OpenAI | Live web search |
| Google-Extended | AI training (Gemini) | |
| ClaudeBot | Anthropic | Model training |
| PerplexityBot | Perplexity | Real-time search |
| Bytespider | ByteDance | Model training |
| cohere-ai | Cohere | Model training |
How to Control AI Crawler Access
The primary mechanism for controlling AI crawlers is robots.txt. Example configuration:
# Allow AI search crawlers (for visibility)
User-agent: ChatGPT-User
Allow: /
User-agent: PerplexityBot
Allow: /
# Block AI training crawlers (optional)
User-agent: GPTBot
Disallow: /
User-agent: Google-Extended
Disallow: /
Key decision framework:
- Want AI search visibility? → Allow retrieval crawlers (ChatGPT-User, PerplexityBot)
- Want to prevent training use? → Block training crawlers (GPTBot, Bytespider)
- Want maximum AI visibility? → Allow all + implement llms.txt
- Want no AI use? → Block all AI bots (but accept invisible to AI search)
Why It Matters
AI crawler management is now a strategic decision. Allowing AI crawlers means your content can appear in AI-generated answers, building brand visibility in the AI search era. Blocking AI crawlers keeps your content out of AI training and answers, but you lose visibility in AI search results. Most brands pursuing GEO should allow retrieval crawlers (ChatGPT-User, PerplexityBot) while making case-by-case decisions on training crawlers (GPTBot, Google-Extended).
For GEO optimization, ensure your robots.txt explicitly allows the retrieval bots that power AI search answers. Combine with llms.txt to guide AI systems toward your most important content.
Frequently Asked Questions
It depends on your goals. If you want your brand to appear in AI-generated answers (ChatGPT, Perplexity, Google AI Mode), you should allow retrieval crawlers. If you're concerned about your content being used for AI model training without compensation, you can selectively block training-specific crawlers like GPTBot while allowing search crawlers like ChatGPT-User.
According to Cloudflare's network data, AI crawler traffic grew over 305% in 2024. This trend continued in 2025, with AI bots now representing a significant portion of all web crawling activity. The growth is driven by both model training needs and the expansion of AI-powered search products.
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