{
  "entity_a": {
    "slug": "claudebot",
    "name": "ClaudeBot"
  },
  "entity_b": {
    "slug": "perplexity-user",
    "name": "Perplexity-User"
  },
  "fields_documented": 14,
  "claims": 21,
  "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": 109,
      "same": false
    },
    {
      "field": "honours_crawl_delay",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 48,
      "claim_id_b": 104,
      "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": "publishes_ip_list",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 49,
      "claim_id_b": 105,
      "same": true
    },
    {
      "field": "purpose_documented",
      "value_a": "training",
      "value_b": "user_fetch",
      "claim_id_a": 51,
      "claim_id_b": 107,
      "same": false
    },
    {
      "field": "reads_llms_txt",
      "value_a": null,
      "value_b": "not_documented",
      "claim_id_a": null,
      "claim_id_b": 110,
      "same": false
    },
    {
      "field": "respects_robots_txt",
      "value_a": "yes",
      "value_b": "no",
      "claim_id_a": 47,
      "claim_id_b": 103,
      "same": false
    },
    {
      "field": "separate_search_and_training_tokens",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 52,
      "claim_id_b": 108,
      "same": false
    },
    {
      "field": "user_agent_string_full",
      "value_a": "not_documented",
      "value_b": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)",
      "claim_id_a": 54,
      "claim_id_b": 111,
      "same": false
    },
    {
      "field": "verifiable_by_rdns",
      "value_a": "not_documented",
      "value_b": "not_documented",
      "claim_id_a": 50,
      "claim_id_b": 106,
      "same": true
    }
  ],
  "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": "Perplexity includes a link to each page that Perplexity-User visits in the Perplexity response.",
      "claim_id_a": null,
      "claim_id_b": 109
    },
    {
      "field": "honours_crawl_delay",
      "statement_a": "Anthropic supports the non-standard robots.txt Crawl-delay extension for ClaudeBot.",
      "statement_b": "Perplexity does not publish whether Perplexity-User honours the robots.txt Crawl-delay directive.",
      "claim_id_a": 48,
      "claim_id_b": 104
    },
    {
      "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": "purpose_documented",
      "statement_a": "ClaudeBot collects web content for training Anthropic generative AI models.",
      "statement_b": "Perplexity-User visits web pages to answer questions that users ask Perplexity.",
      "claim_id_a": 51,
      "claim_id_b": 107
    },
    {
      "field": "reads_llms_txt",
      "statement_a": null,
      "statement_b": "Perplexity does not publish whether Perplexity-User reads llms.txt files.",
      "claim_id_a": null,
      "claim_id_b": 110
    },
    {
      "field": "respects_robots_txt",
      "statement_a": "ClaudeBot honours industry standard robots.txt directives that signal do not crawl.",
      "statement_b": "Perplexity-User ignores robots.txt rules because a user requests each Perplexity-User fetch.",
      "claim_id_a": 47,
      "claim_id_b": 103
    },
    {
      "field": "separate_search_and_training_tokens",
      "statement_a": "Anthropic separates training and search controls into two robots.txt tokens: ClaudeBot for training and Claude-SearchBot for search.",
      "statement_b": "Perplexity does not document Perplexity-User as a search or training opt-out token.",
      "claim_id_a": 52,
      "claim_id_b": 108
    },
    {
      "field": "user_agent_string_full",
      "statement_a": "Anthropic does not publish a full user agent string for ClaudeBot.",
      "statement_b": "Perplexity-User sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user).",
      "claim_id_a": 54,
      "claim_id_b": 111
    }
  ],
  "sources": [
    "https://claude.com/crawling/bots.json",
    "https://docs.perplexity.ai/docs/resources/perplexity-crawlers",
    "https://rattlesnakesbymail.com/observed/claudebot",
    "https://support.claude.com/en/articles/8896518-does-anthropic-crawl-content-from-the-web-and-how-can-site-owners-block-the-crawler",
    "https://www.perplexity.ai/perplexity-user.json"
  ]
}