AI companies
CompanyTo train its modelsTo answer people and search
- OpenAIChatGPTTo train its modelsKept out
GPTBotline 32To answer people and searchPartlyOAI-SearchBotline 48, some pathsChatGPT-Userline 83, let in - AnthropicClaudeTo train its modelsPartly
ClaudeBotline 33, kept outanthropic-ailine 34, kept outClaude-Weblet inTo answer people and searchPartlyClaude-SearchBotline 49, some pathsClaude-Userline 84, let in - GoogleGeminiTo train its modelsPartly
Google-Extendedline 51, some pathsTo answer people and searchLet inGoogle-CloudVertexBot - PerplexityTo train its modelsNone namedTo answer people and searchPartly
PerplexityBotline 50, some pathsPerplexity-Userline 85, let in - MetaMeta AITo train its modelsPartly
meta-externalagentline 38, kept outFacebookBotlet inTo answer people and searchLet inmeta-externalfetchermeta-webindexer - AppleApple IntelligenceTo train its modelsKept out
Applebot-Extendedline 39To answer people and searchNone named - AmazonTo train its modelsKept out
Amazonbotline 37To answer people and searchLet inAmzn-SearchBotAmzn-User - Common Crawlopen data for trainingTo train its modelsKept out
CCBotline 35To answer people and searchNone named - ByteDanceTo train its modelsPartly
Bytespiderline 36, kept outTikTokSpiderlet inTo answer people and searchNone named - MistralLe ChatTo train its modelsNone namedTo answer people and searchLet in
MistralAI-User
1 of the 27 other AI crawlers we know is kept out: ExaBot.
What it tells AI crawlers
It gives no Content Signals and no “noai” tag.
Like 26% of the 833 popular sites whose robots.txt we’ve read since 29 Oct 2026, it keeps at least one AI training crawler out. Of the 1,024 popular sites we’ve checked since 29 Oct 2026, 9% have a page drawn by scripts, 3% 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.