GPTBot is OpenAI's web crawler used to train and update ChatGPT. If GPTBot is blocked in your robots.txt, your content won't be included in ChatGPT's training data or knowledge base, reducing your visibility in ChatGPT answers.

Should I block or allow AI crawlers in robots.txt?

For most brands, allowing AI crawlers is the right choice. If you want to appear in AI answers, you need to let AI crawlers access your content. Blocking AI crawlers reduces your AI discoverability. Some publishers block AI crawlers for content licensing reasons - but this comes at a cost to AI visibility.

Which AI crawler user agents should I know about?

Key AI crawler user agents: GPTBot (OpenAI/ChatGPT), ClaudeBot (Anthropic/Claude), PerplexityBot (Perplexity), Google-Extended (Google AI), Applebot-Extended (Apple), Amazonbot (Amazon), and cohere-ai (Cohere). You can allow or block each individually in robots.txt.

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Is your robots.txt open to AI crawlers?

Validate your robots.txt for GPTBot, ClaudeBot, PerplexityBot, Google-Extended, and other AI crawlers. See exactly which bots are allowed, blocked, or affected by misconfigured directives.

Blocking GPTBot means ChatGPT can't index your content

Incorrect robots.txt rules silently kill AI visibility

AI crawlers use different user agents - check each one

Most sites have at least one misconfigured AI crawler rule

AI Robots.txt Checker

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Full robots.txt analysis is available in the Mentd. platform. The checker above validates your domain's robots.txt rules for each AI crawler user agent.

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AI crawlers checked

GPTBot

ChatGPT (OpenAI)

ClaudeBot

Claude (Anthropic)

PerplexityBot

Perplexity

Google-Extended

Google AI / Bard

Applebot-Extended

Apple AI

Amazonbot

Amazon AI

cohere-ai

Cohere

Bytespider

ByteDance AI

Why robots.txt matters for AI visibility

AI language models are trained on and continuously updated from web content. AI crawlers like GPTBot, ClaudeBot, and PerplexityBot follow your robots.txt rules just like search engine crawlers do. If you block them — intentionally or accidentally — your content won't be included in AI training data or real-time retrieval.

The most common problem: sites that added a blanket Disallow: / rule for aggressive scrapers are now inadvertently blocking AI indexers they actually want.

Example: Allow all AI crawlers

User-agent: GPTBot
Allow: /

User-agent: ClaudeBot
Allow: /

User-agent: PerplexityBot
Allow: /

User-agent: Google-Extended
Allow: /

User-agent: *
Disallow: /api/
Disallow: /admin/

Common questions

What is GPTBot and why does it matter?

GPTBot is OpenAI's web crawler. It indexes public web content used to train and update ChatGPT and other OpenAI models. If GPTBot is blocked, your brand and content won't be part of ChatGPT's knowledge base, directly hurting your AI visibility.

Should I block or allow AI crawlers?

For most brands, allowing AI crawlers is the right choice. If you want your brand to appear in AI answers, you need AI crawlers to access your content. Publishers blocking AI crawlers for licensing reasons should understand they're trading AI visibility for that protection.

Do AI crawlers respect robots.txt?

Yes. GPTBot, ClaudeBot, PerplexityBot, and Google-Extended all honor robots.txt directives. This is confirmed by each company's documentation.

What's the difference between blocking GPTBot and Google-Extended?

GPTBot controls ChatGPT access. Google-Extended controls Google's AI features (like AI Overviews / Bard). You can block them independently - for example, allowing Google-Extended while blocking GPTBot.

Go beyond robots.txt.

The full platform checks crawler access paths, rendering issues, and meta tag directives — not just robots.txt.

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