AI companies
CompanyTo train its modelsTo answer people and search
- OpenAIChatGPTTo train its modelsKept out
GPTBotline 109To answer people and searchKept outOAI-SearchBotline 125ChatGPT-Userline 93 - AnthropicClaudeTo train its modelsPartly
ClaudeBotline 99, kept outanthropic-ailet inClaude-Weblet inTo answer people and searchKept outClaude-SearchBotline 95Claude-Userline 97 - GoogleGeminiTo train its modelsLet in
Google-ExtendedTo answer people and searchLet inGoogle-CloudVertexBot - PerplexityTo train its modelsNone namedTo answer people and searchKept out
PerplexityBotline 129Perplexity-Userline 127 - MetaMeta AITo train its modelsPartly
meta-externalagentline 117, kept outFacebookBotlet inTo answer people and searchKept outmeta-externalfetcherline 119meta-webindexerline 121 - AppleApple IntelligenceTo train its modelsKept out
Applebot-Extendedline 85To answer people and searchNone named - AmazonTo train its modelsKept out
Amazonbotline 79To answer people and searchKept outAmzn-SearchBotline 81Amzn-Userline 83 - Common Crawlopen data for trainingTo train its modelsKept out
CCBotline 91To answer people and searchNone named - ByteDanceTo train its modelsPartly
Bytespiderline 89, kept outTikTokSpiderlet inTo answer people and searchNone named - MistralLe ChatTo train its modelsNone namedTo answer people and searchKept out
MistralAI-Userline 123
6 of the 27 other AI crawlers we know are kept out: cohere-ai, cohere-training-data-crawler, AI2Bot, YouBot, Cotoyogi and 1 more.
What it tells AI crawlers
It gives no Content Signals and no “noai” tag.
Like 29% of the 335 popular sites whose robots.txt we’ve read since 29 Oct 2026, it keeps at least one AI training crawler out. Of the 418 popular sites we’ve checked since 29 Oct 2026, 10% have a page drawn by scripts, 2% send a Markdown copy, 10% have an llms.txt and 3% offer a file for AI agents. How many websites block AI crawlers?
We read the site once, as our named bot: its robots.txt, read as crawlers read it, its home page and the files AI tools ask sites for. What we couldn’t read says so. robots.txt asks and doesn’t enforce: a firewall can treat AI crawlers differently from us.