{
  "entity_a": {
    "slug": "googleother",
    "name": "GoogleOther"
  },
  "entity_b": {
    "slug": "gptbot",
    "name": "GPTBot"
  },
  "fields_documented": 11,
  "claims": 17,
  "last_verified": "2026-09-15",
  "fields": [
    {
      "field": "honours_crawl_delay",
      "value_a": "no",
      "value_b": "not_documented",
      "claim_id_a": 72,
      "claim_id_b": 79,
      "same": false
    },
    {
      "field": "observed_fetches_robots_txt",
      "value_a": "no",
      "value_b": null,
      "claim_id_a": 147,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "observed_requested_mcp_endpoint",
      "value_a": "yes",
      "value_b": null,
      "claim_id_a": 146,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "publishes_ip_list",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 73,
      "claim_id_b": 80,
      "same": true
    },
    {
      "field": "purpose_documented",
      "value_a": "mixed",
      "value_b": "training",
      "claim_id_a": 75,
      "claim_id_b": 82,
      "same": false
    },
    {
      "field": "respects_robots_txt",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 71,
      "claim_id_b": 78,
      "same": true
    },
    {
      "field": "robots_txt_fetch_marker",
      "value_a": null,
      "value_b": "yes",
      "claim_id_a": null,
      "claim_id_b": 85,
      "same": false
    },
    {
      "field": "robots_txt_token",
      "value_a": "GoogleOther",
      "value_b": null,
      "claim_id_a": 77,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "separate_search_and_training_tokens",
      "value_a": "not_documented",
      "value_b": "yes",
      "claim_id_a": 76,
      "claim_id_b": 83,
      "same": false
    },
    {
      "field": "user_agent_string_full",
      "value_a": null,
      "value_b": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; GPTBot/1.4; +https://openai.com/gptbot",
      "claim_id_a": null,
      "claim_id_b": 84,
      "same": false
    },
    {
      "field": "verifiable_by_rdns",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 74,
      "claim_id_b": 81,
      "same": false
    }
  ],
  "differences": [
    {
      "field": "honours_crawl_delay",
      "statement_a": "Google does not support the robots.txt Crawl-delay directive for GoogleOther.",
      "statement_b": "OpenAI does not publish whether GPTBot honours the robots.txt Crawl-delay directive.",
      "claim_id_a": 72,
      "claim_id_b": 79
    },
    {
      "field": "observed_fetches_robots_txt",
      "statement_a": "GoogleOther made 93 requests to Rattlesnakes By Mail between 2026-09-13T20:00Z and 2026-09-15T09:00Z and fetched /robots.txt on none of those requests. GoogleOther's first request to Rattlesnakes By Mail was the home page at 2026-09-14T12:03:30Z.",
      "statement_b": null,
      "claim_id_a": 147,
      "claim_id_b": null
    },
    {
      "field": "observed_requested_mcp_endpoint",
      "statement_a": "GoogleOther requested the /mcp endpoint of Rattlesnakes By Mail twice between 2026-09-13T20:00Z and 2026-09-15T09:00Z, at 2026-09-14T15:07:30Z and at 2026-09-14T18:27:49Z. Rattlesnakes By Mail returned status 405 to both GoogleOther requests for /mcp.",
      "statement_b": null,
      "claim_id_a": 146,
      "claim_id_b": null
    },
    {
      "field": "purpose_documented",
      "statement_a": "GoogleOther is a generic crawler that Google product teams use to fetch publicly accessible content from sites.",
      "statement_b": "GPTBot crawls content that may be used to train OpenAI generative AI foundation models.",
      "claim_id_a": 75,
      "claim_id_b": 82
    },
    {
      "field": "robots_txt_fetch_marker",
      "statement_a": null,
      "statement_b": "OpenAI may add a robots.txt marker to the GPTBot user agent string when GPTBot fetches robots.txt files.",
      "claim_id_a": null,
      "claim_id_b": 85
    },
    {
      "field": "robots_txt_token",
      "statement_a": "The robots.txt token for GoogleOther is GoogleOther.",
      "statement_b": null,
      "claim_id_a": 77,
      "claim_id_b": null
    },
    {
      "field": "separate_search_and_training_tokens",
      "statement_a": "Google does not document whether content fetched by GoogleOther is used for Gemini training.",
      "statement_b": "OpenAI separates search and training controls into two robots.txt tokens: OAI-SearchBot for search and GPTBot for training.",
      "claim_id_a": 76,
      "claim_id_b": 83
    },
    {
      "field": "user_agent_string_full",
      "statement_a": null,
      "statement_b": "GPTBot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; GPTBot/1.4; +https://openai.com/gptbot.",
      "claim_id_a": null,
      "claim_id_b": 84
    },
    {
      "field": "verifiable_by_rdns",
      "statement_a": "GoogleOther requests are verifiable by reverse DNS lookup resolving to googlebot.com, google.com, or googleusercontent.com.",
      "statement_b": "OpenAI does not publish a reverse-DNS verification method for GPTBot.",
      "claim_id_a": 74,
      "claim_id_b": 81
    }
  ],
  "sources": [
    "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/crawling-indexing/google-common-crawlers",
    "https://developers.google.com/static/crawling/ipranges/common-crawlers.json",
    "https://developers.openai.com/api/docs/bots",
    "https://openai.com/gptbot.json",
    "https://rattlesnakesbymail.com/observed/googleother"
  ]
}