Rattlesnakes By Mail

ClaudeBot vs PerplexityBot

ClaudeBot and PerplexityBot compared on 14 documented fields, from 21 claims, last verified 2026-09-15.

Field	ClaudeBot	PerplexityBot	Comparison
anti_circumvention_stance	documented	not documented	different
cites_sources	not documented	yes	different
honours_crawl_delay	yes	not_documented	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	yes	same
purpose_documented	training	search	different
reads_llms_txt	not documented	not_documented	different
respects_robots_txt	yes	yes	same
separate_search_and_training_tokens	yes	not_documented	different
user_agent_string_full	not_documented	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot)	different
verifiable_by_rdns	not_documented	not_documented	same

Differences

Field	ClaudeBot statement	PerplexityBot statement
anti_circumvention_stance	ClaudeBot respects anti-circumvention technologies and does not bypass CAPTCHAs on crawled sites.	not documented
cites_sources	not documented	Perplexity links to the websites that PerplexityBot surfaces in Perplexity search results.
honours_crawl_delay	Anthropic supports the non-standard robots.txt Crawl-delay extension for ClaudeBot.	Perplexity does not publish whether PerplexityBot honours the robots.txt Crawl-delay directive.
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
purpose_documented	ClaudeBot collects web content for training Anthropic generative AI models.	PerplexityBot surfaces and links websites in Perplexity search results.
reads_llms_txt	not documented	Perplexity does not publish whether PerplexityBot reads llms.txt files.
separate_search_and_training_tokens	Anthropic separates training and search controls into two robots.txt tokens: ClaudeBot for training and Claude-SearchBot for search.	Perplexity does not document a separate training crawler token alongside PerplexityBot.
user_agent_string_full	Anthropic does not publish a full user agent string for ClaudeBot.	PerplexityBot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot).

Sources