{
  "entity_a": {
    "slug": "bingbot",
    "name": "Bingbot"
  },
  "entity_b": {
    "slug": "chatgpt-user",
    "name": "ChatGPT-User"
  },
  "fields_documented": 11,
  "claims": 20,
  "last_verified": "2026-09-14",
  "fields": [
    {
      "field": "cites_sources",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 127,
      "claim_id_b": 25,
      "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": 20,
      "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": 21,
      "same": true
    },
    {
      "field": "purpose_documented",
      "value_a": "yes",
      "value_b": "user_fetch",
      "claim_id_a": 125,
      "claim_id_b": 23,
      "same": false
    },
    {
      "field": "reads_llms_txt",
      "value_a": "not_documented",
      "value_b": "not_documented",
      "claim_id_a": 128,
      "claim_id_b": 26,
      "same": true
    },
    {
      "field": "respects_robots_txt",
      "value_a": "yes",
      "value_b": "partial",
      "claim_id_a": 121,
      "claim_id_b": 19,
      "same": false
    },
    {
      "field": "separate_search_and_training_tokens",
      "value_a": "no",
      "value_b": "not_documented",
      "claim_id_a": 126,
      "claim_id_b": 24,
      "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; ChatGPT-User/1.0; +https://openai.com/bot",
      "claim_id_a": 129,
      "claim_id_b": 27,
      "same": false
    },
    {
      "field": "verifiable_by_rdns",
      "value_a": "yes",
      "value_b": "not_documented",
      "claim_id_a": 124,
      "claim_id_b": 22,
      "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": "OpenAI does not publish whether ChatGPT responses cite pages fetched by ChatGPT-User.",
      "claim_id_a": 127,
      "claim_id_b": 25
    },
    {
      "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 ChatGPT-User honours the robots.txt Crawl-delay directive.",
      "claim_id_a": 122,
      "claim_id_b": 20
    },
    {
      "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": "ChatGPT-User visits web pages for user actions in ChatGPT and in Custom GPTs.",
      "claim_id_a": 125,
      "claim_id_b": 23
    },
    {
      "field": "respects_robots_txt",
      "statement_a": "Bingbot honors robots.txt directives and other Microsoft-supported control mechanisms that content owners set for crawling.",
      "statement_b": "ChatGPT-User fetches pages in response to user actions in ChatGPT, and OpenAI states that robots.txt rules may not apply to ChatGPT-User fetches.",
      "claim_id_a": 121,
      "claim_id_b": 19
    },
    {
      "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 does not document ChatGPT-User as a search or training opt-out token.",
      "claim_id_a": 126,
      "claim_id_b": 24
    },
    {
      "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": "ChatGPT-User sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot.",
      "claim_id_a": 129,
      "claim_id_b": 27
    },
    {
      "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 ChatGPT-User.",
      "claim_id_a": 124,
      "claim_id_b": 22
    }
  ],
  "sources": [
    "https://blogs.bing.com/search/April-2025/Introducing-Copilot-Search-in-Bing",
    "https://developers.openai.com/api/docs/bots",
    "https://openai.com/chatgpt-user.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"
  ]
}