Frequently Asked Questions

Common questions about AI crawlers, LLMs, and how language models interact with the web.

What is a web crawler bot?

A web crawler is an automated program that systematically browses the web to index content. Search engines use crawlers to discover and index pages. AI companies use crawlers to collect training data or answer user queries in real time.

What is GPTBot?

GPTBot is OpenAI's official web crawler. It collects web content that may be used to improve future AI models. Website owners can allow or block it via their robots.txt file using the User-agent: GPTBot directive.

What is ClaudeBot?

ClaudeBot is Anthropic's web crawler, used to fetch web content when Claude needs to browse the internet or to collect data for training purposes. It identifies itself with ClaudeBot in its User-Agent string.

What is PerplexityBot?

PerplexityBot is the crawler used by Perplexity AI, an AI-powered search engine. Unlike traditional search crawlers that index for later retrieval, PerplexityBot often fetches pages in real time to answer user queries directly.

What is llms.txt?

The llms.txt file is a proposed standard similar to robots.txt that website owners place in their root directory to provide structured information about their site specifically for AI language models. It helps LLMs understand site structure, permissions, and key content areas.

What percentage of web traffic comes from AI bots in 2025?

Estimates vary by methodology. For website referral traffic, LLMs currently account for around 0.1–1% of sessions depending on the industry. However, AI crawlers account for roughly 33% of organic search activity according to BrightEdge research. The ratio is growing rapidly year over year.

Do AI bots respect robots.txt?

Major AI companies including OpenAI, Anthropic, and Google officially claim their crawlers respect robots.txt directives. However, compliance varies — some third-party scrapers and smaller AI companies may not follow the standard.

How do I allow AI crawlers on my website?

Add explicit Allow directives in your robots.txt for each AI bot User-Agent. Key ones include GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and Applebot-Extended. Also create an llms.txt file describing your content.

How do I detect AI bot traffic?

AI bots identify themselves via their User-Agent string. You can detect them by checking for known identifiers like GPTBot, ClaudeBot, PerplexityBot in server logs or middleware. Standard analytics tools like Google Analytics filter bots out by default, so custom logging is required to track AI traffic.

What content do AI crawlers prefer?

Research shows AI crawlers prefer structured, factual content. FAQ pages, articles with clear headings, and content with Schema.org markup tend to receive more citations. Articles over 2,900 words average 5.1 citations while those under 800 words get 3.2, according to SE Ranking research from November 2025.