{
  "entity_a": {
    "slug": "claudebot",
    "name": "ClaudeBot"
  },
  "entity_b": {
    "slug": "googlebot",
    "name": "Googlebot"
  },
  "fields_documented": 15,
  "claims": 22,
  "last_verified": "2026-09-15",
  "fields": [
    {
      "field": "anti_circumvention_stance",
      "value_a": "documented",
      "value_b": null,
      "claim_id_a": 53,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "cites_sources",
      "value_a": null,
      "value_b": "yes",
      "claim_id_a": null,
      "claim_id_b": 69,
      "same": false
    },
    {
      "field": "honours_crawl_delay",
      "value_a": "yes",
      "value_b": "no",
      "claim_id_a": 48,
      "claim_id_b": 64,
      "same": false
    },
    {
      "field": "observed_fetches_json",
      "value_a": "yes",
      "value_b": null,
      "claim_id_a": 143,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "observed_fetches_markdown",
      "value_a": "yes",
      "value_b": null,
      "claim_id_a": 142,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "observed_first_request_path",
      "value_a": "/sitemap.xml",
      "value_b": null,
      "claim_id_a": 144,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "observed_format_pass_order",
      "value_a": "html_json_md",
      "value_b": null,
      "claim_id_a": 145,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "observed_verified_request_ratio_census",
      "value_a": null,
      "value_b": "0.991",
      "claim_id_a": null,
      "claim_id_b": 149,
      "same": false
    },
    {
      "field": "publishes_ip_list",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 49,
      "claim_id_b": 65,
      "same": true
    },
    {
      "field": "purpose_documented",
      "value_a": "training",
      "value_b": "search",
      "claim_id_a": 51,
      "claim_id_b": 67,
      "same": false
    },
    {
      "field": "reads_llms_txt",
      "value_a": null,
      "value_b": "no",
      "claim_id_a": null,
      "claim_id_b": 132,
      "same": false
    },
    {
      "field": "respects_robots_txt",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 47,
      "claim_id_b": 63,
      "same": true
    },
    {
      "field": "separate_search_and_training_tokens",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 52,
      "claim_id_b": 68,
      "same": true
    },
    {
      "field": "user_agent_string_full",
      "value_a": "not_documented",
      "value_b": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html)",
      "claim_id_a": 54,
      "claim_id_b": 70,
      "same": false
    },
    {
      "field": "verifiable_by_rdns",
      "value_a": "not_documented",
      "value_b": "yes",
      "claim_id_a": 50,
      "claim_id_b": 66,
      "same": false
    }
  ],
  "differences": [
    {
      "field": "anti_circumvention_stance",
      "statement_a": "ClaudeBot respects anti-circumvention technologies and does not bypass CAPTCHAs on crawled sites.",
      "statement_b": null,
      "claim_id_a": 53,
      "claim_id_b": null
    },
    {
      "field": "cites_sources",
      "statement_a": null,
      "statement_b": "Google AI Overviews and AI Mode return AI generated responses with links to supporting websites.",
      "claim_id_a": null,
      "claim_id_b": 69
    },
    {
      "field": "honours_crawl_delay",
      "statement_a": "Anthropic supports the non-standard robots.txt Crawl-delay extension for ClaudeBot.",
      "statement_b": "Google does not support the robots.txt Crawl-delay directive for Googlebot.",
      "claim_id_a": 48,
      "claim_id_b": 64
    },
    {
      "field": "observed_fetches_json",
      "statement_a": "ClaudeBot made 177 JSON requests to Rattlesnakes By Mail between 2026-09-13T20:00Z and 2026-09-15T09:00Z, covering the .json twin of 170 base paths. The .json URLs of Rattlesnakes By Mail appear in no entry of the 171 URL sitemap.",
      "statement_b": null,
      "claim_id_a": 143,
      "claim_id_b": null
    },
    {
      "field": "observed_fetches_markdown",
      "statement_a": "ClaudeBot fetched the .md twin of 170 base paths on Rattlesnakes By Mail between 2026-09-13T20:00Z and 2026-09-15T09:00Z, 170 Markdown requests of 542 ClaudeBot requests in that window. The .md URLs of Rattlesnakes By Mail appear in no entry of the 171 URL sitemap.",
      "statement_b": null,
      "claim_id_a": 142,
      "claim_id_b": null
    },
    {
      "field": "observed_first_request_path",
      "statement_a": "ClaudeBot's first request to Rattlesnakes By Mail between 2026-09-13T20:00Z and 2026-09-15T09:00Z was /sitemap.xml at 2026-09-14T19:53:45Z. ClaudeBot fetched /robots.txt on the second request to Rattlesnakes By Mail.",
      "statement_b": null,
      "claim_id_a": 144,
      "claim_id_b": null
    },
    {
      "field": "observed_format_pass_order",
      "statement_a": "ClaudeBot fetched Rattlesnakes By Mail in three format passes between 2026-09-13T20:00Z and 2026-09-15T09:00Z, HTML from 2026-09-14T20:52Z to 2026-09-14T20:57Z, then JSON from 2026-09-14T21:37Z to 2026-09-14T21:56Z, then Markdown from 2026-09-14T21:37Z to 2026-09-14T21:57Z. The same order holds on 170 of 170 base paths that ClaudeBot fetched in all three formats on Rattlesnakes By Mail.",
      "statement_b": null,
      "claim_id_a": 145,
      "claim_id_b": null
    },
    {
      "field": "observed_verified_request_ratio_census",
      "statement_a": null,
      "statement_b": "Googlebot requests to Rattlesnakes By Mail matched Google's published IP ranges on 108 of 109 requests between 2026-09-13T20:00Z and 2026-09-15T09:00Z. Googlebot's first request to Rattlesnakes By Mail in that window was /robots.txt at 2026-09-14T11:53:00Z.",
      "claim_id_a": null,
      "claim_id_b": 149
    },
    {
      "field": "purpose_documented",
      "statement_a": "ClaudeBot collects web content for training Anthropic generative AI models.",
      "statement_b": "Googlebot crawls pages for Google Search, Google Images, Google Video, Google News, and Discover.",
      "claim_id_a": 51,
      "claim_id_b": 67
    },
    {
      "field": "reads_llms_txt",
      "statement_a": null,
      "statement_b": "Google Search does not use llms.txt files.",
      "claim_id_a": null,
      "claim_id_b": 132
    },
    {
      "field": "user_agent_string_full",
      "statement_a": "Anthropic does not publish a full user agent string for ClaudeBot.",
      "statement_b": "Googlebot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html).",
      "claim_id_a": 54,
      "claim_id_b": 70
    },
    {
      "field": "verifiable_by_rdns",
      "statement_a": "Anthropic does not publish a reverse-DNS verification method for ClaudeBot.",
      "statement_b": "Googlebot requests are verifiable by reverse DNS lookup resolving to googlebot.com, google.com, or googleusercontent.com.",
      "claim_id_a": 50,
      "claim_id_b": 66
    }
  ],
  "sources": [
    "https://claude.com/crawling/bots.json",
    "https://developers.google.com/crawling/docs/crawlers-fetchers/verifying-googlebot",
    "https://developers.google.com/search/blog/2019/07/a-note-on-unsupported-rules-in-robotstxt",
    "https://developers.google.com/search/docs/appearance/ai-features",
    "https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers",
    "https://developers.google.com/search/docs/fundamentals/ai-optimization-guide",
    "https://developers.google.com/static/crawling/ipranges/common-crawlers.json",
    "https://rattlesnakesbymail.com/observed/claudebot",
    "https://rattlesnakesbymail.com/observed/googlebot",
    "https://support.claude.com/en/articles/8896518-does-anthropic-crawl-content-from-the-web-and-how-can-site-owners-block-the-crawler"
  ]
}