# ClaudeBot vs Google-Extended

ClaudeBot and Google-Extended compared on 14 documented fields, from 20 claims, last verified 2026-09-15.

| Field | ClaudeBot | Google-Extended | Comparison |
| --- | --- | --- | --- |
| anti_circumvention_stance | documented | not documented | different |
| honours_crawl_delay | yes | n/a | different |
| observed_fetches_json | yes | not documented | different |
| observed_fetches_markdown | yes | not documented | different |
| observed_first_request_path | /sitemap.xml | not documented | different |
| observed_format_pass_order | html_json_md | not documented | different |
| publishes_ip_list | yes | no | different |
| purpose_documented | training | policy_only | different |
| respects_robots_txt | yes | n/a | different |
| robots_token_differs_from_ua | not documented | yes | different |
| separate_search_and_training_tokens | yes | yes | same |
| user_agent_string_full | not_documented | not documented | different |
| verifiable_by_rdns | not_documented | n/a | different |
| what_it_controls | not documented | Gemini model training and grounding, not Search inclusion | different |

## Differences

| Field | ClaudeBot statement | Google-Extended statement |
| --- | --- | --- |
| anti_circumvention_stance | ClaudeBot respects anti-circumvention technologies and does not bypass CAPTCHAs on crawled sites. | not documented |
| honours_crawl_delay | Anthropic supports the non-standard robots.txt Crawl-delay extension for ClaudeBot. | Google does not publish any Crawl-delay behaviour for the Google-Extended token. |
| observed_fetches_json | 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. | not documented |
| observed_fetches_markdown | 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. | not documented |
| observed_first_request_path | 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. | not documented |
| observed_format_pass_order | 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. | not documented |
| publishes_ip_list | Anthropic publishes the IP address ranges used by ClaudeBot as a JSON file at https://claude.com/crawling/bots.json. | Google publishes no IP list for Google-Extended because Google-Extended has no separate HTTP request user agent string. |
| purpose_documented | ClaudeBot collects web content for training Anthropic generative AI models. | Google-Extended is a standalone product token that controls whether Google uses crawled content to train Gemini models. |
| respects_robots_txt | ClaudeBot honours industry standard robots.txt directives that signal do not crawl. | Google-Extended is a robots.txt token that publishers set to control use of crawled content for Gemini training. |
| robots_token_differs_from_ua | not documented | Google-Extended is a robots.txt control token and does not correspond to a crawler user agent string. |
| user_agent_string_full | Anthropic does not publish a full user agent string for ClaudeBot. | not documented |
| verifiable_by_rdns | Anthropic does not publish a reverse-DNS verification method for ClaudeBot. | Google does not publish a reverse-DNS verification method for Google-Extended. |
| what_it_controls | not documented | Google-Extended controls AI training and grounding in Google systems and does not control Google Search inclusion. |

## Sources

- https://claude.com/crawling/bots.json
- https://developers.google.com/search/docs/appearance/ai-features
- https://developers.google.com/search/docs/crawling-indexing/google-common-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