{ "entity_a": { "slug": "bingbot", "name": "Bingbot" }, "entity_b": { "slug": "claudebot", "name": "ClaudeBot" }, "fields_documented": 16, "claims": 23, "last_verified": "2026-09-15", "fields": [ { "field": "anti_circumvention_stance", "value_a": null, "value_b": "documented", "claim_id_a": null, "claim_id_b": 53, "same": false }, { "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": "yes", "claim_id_a": 122, "claim_id_b": 48, "same": true }, { "field": "observed_fetches_json", "value_a": null, "value_b": "yes", "claim_id_a": null, "claim_id_b": 143, "same": false }, { "field": "observed_fetches_markdown", "value_a": null, "value_b": "yes", "claim_id_a": null, "claim_id_b": 142, "same": false }, { "field": "observed_first_request_path", "value_a": null, "value_b": "/sitemap.xml", "claim_id_a": null, "claim_id_b": 144, "same": false }, { "field": "observed_format_pass_order", "value_a": null, "value_b": "html_json_md", "claim_id_a": null, "claim_id_b": 145, "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": 49, "same": true }, { "field": "purpose_documented", "value_a": "yes", "value_b": "training", "claim_id_a": 125, "claim_id_b": 51, "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": 47, "same": true }, { "field": "separate_search_and_training_tokens", "value_a": "no", "value_b": "yes", "claim_id_a": 126, "claim_id_b": 52, "same": false }, { "field": "user_agent_string_full", "value_a": "Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)", "value_b": "not_documented", "claim_id_a": 129, "claim_id_b": 54, "same": false }, { "field": "verifiable_by_rdns", "value_a": "yes", "value_b": "not_documented", "claim_id_a": 124, "claim_id_b": 50, "same": false } ], "differences": [ { "field": "anti_circumvention_stance", "statement_a": null, "statement_b": "ClaudeBot respects anti-circumvention technologies and does not bypass CAPTCHAs on crawled sites.", "claim_id_a": null, "claim_id_b": 53 }, { "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": "observed_fetches_json", "statement_a": null, "statement_b": "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.", "claim_id_a": null, "claim_id_b": 143 }, { "field": "observed_fetches_markdown", "statement_a": null, "statement_b": "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.", "claim_id_a": null, "claim_id_b": 142 }, { "field": "observed_first_request_path", "statement_a": null, "statement_b": "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.", "claim_id_a": null, "claim_id_b": 144 }, { "field": "observed_format_pass_order", "statement_a": null, "statement_b": "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.", "claim_id_a": null, "claim_id_b": 145 }, { "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": "ClaudeBot collects web content for training Anthropic generative AI models.", "claim_id_a": 125, "claim_id_b": 51 }, { "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": "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": "Anthropic separates training and search controls into two robots.txt tokens: ClaudeBot for training and Claude-SearchBot for search.", "claim_id_a": 126, "claim_id_b": 52 }, { "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": "Anthropic does not publish a full user agent string for ClaudeBot.", "claim_id_a": 129, "claim_id_b": 54 }, { "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": "Anthropic does not publish a reverse-DNS verification method for ClaudeBot.", "claim_id_a": 124, "claim_id_b": 50 } ], "sources": [ "https://blogs.bing.com/search/April-2025/Introducing-Copilot-Search-in-Bing", "https://claude.com/crawling/bots.json", "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.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" ] }