{
  "entity_a": {
    "slug": "bingbot",
    "name": "Bingbot"
  },
  "entity_b": {
    "slug": "gptbot",
    "name": "GPTBot"
  },
  "fields_documented": 12,
  "claims": 19,
  "last_verified": "2026-09-14",
  "fields": [
    {
      "field": "cites_sources",
      "value_a": "yes",
      "value_b": null,
      "claim_id_a": 127,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "follows_noarchive",
      "value_a": "yes",
      "value_b": null,
      "claim_id_a": 131,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "honours_crawl_delay",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 122,
      "claim_id_b": 79,
      "same": false
    },
    {
      "field": "opt_out_mechanism",
      "value_a": "yes",
      "value_b": null,
      "claim_id_a": 130,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "publishes_ip_list",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 123,
      "claim_id_b": 80,
      "same": true
    },
    {
      "field": "purpose_documented",
      "value_a": "yes",
      "value_b": "training",
      "claim_id_a": 125,
      "claim_id_b": 82,
      "same": false
    },
    {
      "field": "reads_llms_txt",
      "value_a": "not_documented",
      "value_b": null,
      "claim_id_a": 128,
      "claim_id_b": null,
      "same": false
    },
    {
      "field": "respects_robots_txt",
      "value_a": "yes",
      "value_b": "yes",
      "claim_id_a": 121,
      "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": "separate_search_and_training_tokens",
      "value_a": "no",
      "value_b": "yes",
      "claim_id_a": 126,
      "claim_id_b": 83,
      "same": false
    },
    {
      "field": "user_agent_string_full",
      "value_a": "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)",
      "value_b": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; GPTBot/1.4; +https://openai.com/gptbot",
      "claim_id_a": 129,
      "claim_id_b": 84,
      "same": false
    },
    {
      "field": "verifiable_by_rdns",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 124,
      "claim_id_b": 81,
      "same": false
    }
  ],
  "differences": [
    {
      "field": "cites_sources",
      "statement_a": "Copilot Search in Bing delivers clearly cited sources alongside generative answers to support publishers and content owners.",
      "statement_b": null,
      "claim_id_a": 127,
      "claim_id_b": null
    },
    {
      "field": "follows_noarchive",
      "statement_a": "Bingbot excludes noarchive-tagged content from Copilot and Chat answers and from generative AI training data.",
      "statement_b": null,
      "claim_id_a": 131,
      "claim_id_b": null
    },
    {
      "field": "honours_crawl_delay",
      "statement_a": "Microsoft states that a crawl-delay directive in robots.txt always takes precedence over Bing Webmaster Tools crawl control settings for Bingbot.",
      "statement_b": "OpenAI does not publish whether GPTBot honours the robots.txt Crawl-delay directive.",
      "claim_id_a": 122,
      "claim_id_b": 79
    },
    {
      "field": "opt_out_mechanism",
      "statement_a": "Microsoft lets publishers block Bingbot content from Copilot answers and AI training using noarchive and nocache tags.",
      "statement_b": null,
      "claim_id_a": 130,
      "claim_id_b": null
    },
    {
      "field": "purpose_documented",
      "statement_a": "Bingbot serves as Microsoft's standard crawler and handles most of Bing's daily web crawling.",
      "statement_b": "GPTBot crawls content that may be used to train OpenAI generative AI foundation models.",
      "claim_id_a": 125,
      "claim_id_b": 82
    },
    {
      "field": "reads_llms_txt",
      "statement_a": "Microsoft does not publish whether Bingbot reads llms.txt files.",
      "statement_b": null,
      "claim_id_a": 128,
      "claim_id_b": null
    },
    {
      "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": "separate_search_and_training_tokens",
      "statement_a": "Microsoft controls Bingbot's use in AI training through meta tags rather than publishing a separate training-specific crawler token.",
      "statement_b": "OpenAI separates search and training controls into two robots.txt tokens: OAI-SearchBot for search and GPTBot for training.",
      "claim_id_a": 126,
      "claim_id_b": 83
    },
    {
      "field": "user_agent_string_full",
      "statement_a": "Bingbot sends a user agent string containing bingbot/2.0 and a link to Microsoft's bingbot.htm page.",
      "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": 129,
      "claim_id_b": 84
    },
    {
      "field": "verifiable_by_rdns",
      "statement_a": "Microsoft verifies Bingbot traffic through reverse DNS lookups that resolve to hostnames ending in search.msn.com.",
      "statement_b": "OpenAI does not publish a reverse-DNS verification method for GPTBot.",
      "claim_id_a": 124,
      "claim_id_b": 81
    }
  ],
  "sources": [
    "https://blogs.bing.com/search/April-2025/Introducing-Copilot-Search-in-Bing",
    "https://developers.openai.com/api/docs/bots",
    "https://openai.com/gptbot.json",
    "https://www.bing.com/toolbox/bingbot.json",
    "https://www.bing.com/webmasters/help/ai-performance-9f8e7d6c",
    "https://www.bing.com/webmasters/help/crawl-control-55a30303",
    "https://www.bing.com/webmasters/help/how-to-verify-bingbot-3905dc26",
    "https://www.bing.com/webmasters/help/robots-meta-tags-and-attributes-that-bing-supports-5198d240",
    "https://www.bing.com/webmasters/help/which-crawlers-does-bing-use-8c184ec0"
  ]
}