AI companies
CompanyTo train its modelsTo answer people and search
- OpenAIChatGPTTo train its modelsKept out
GPTBotline 34To answer people and searchLet inOAI-SearchBotChatGPT-Userline 27 - AnthropicClaudeTo train its modelsPartly
ClaudeBotline 40, kept outanthropic-ailine 43, kept outClaude-Weblet inTo answer people and searchLet inClaude-SearchBotClaude-User - GoogleGeminiTo train its modelsKept out
Google-Extendedline 37To answer people and searchLet inGoogle-CloudVertexBot - PerplexityTo train its modelsNone namedTo answer people and searchLet in
PerplexityBotline 30Perplexity-User - MetaMeta AITo train its modelsPartly
meta-externalagentlet inFacebookBotline 58, kept outTo answer people and searchLet inmeta-externalfetchermeta-webindexer - AppleApple IntelligenceTo train its modelsKept out
Applebot-Extendedline 52To answer people and searchNone named - AmazonTo train its modelsLet in
AmazonbotTo answer people and searchLet inAmzn-SearchBotAmzn-User - Common Crawlopen data for trainingTo train its modelsKept out
CCBotline 46To answer people and searchNone named - ByteDanceTo train its modelsPartly
Bytespiderline 49, kept outTikTokSpiderlet inTo answer people and searchNone named - MistralLe ChatTo train its modelsNone namedTo answer people and searchLet in
MistralAI-User
3 of the 27 other AI crawlers we know are kept out: cohere-ai, Diffbot and Omgilibot.
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.