Rattlesnakes By Mail

ChatGPT-User vs PerplexityBot

ChatGPT-User and PerplexityBot compared on 9 documented fields, from 18 claims, last verified 2026-09-13.

How many of the compared fields have the same answer for both crawlers, and how many differ.

ChatGPT-User and PerplexityBot, fields comparedChatGPT-User and PerplexityBot, fields compared. Same is the largest with 5 fields, out of 9 fields in total.Same: 5 fieldsSame5Different: 4 fieldsDifferent4
ChatGPT-User and PerplexityBot, fields compared. Same is the largest with 5 fields, out of 9 fields in total. Source: each vendor's own crawler documentation, quoted and dated on every claim page.
FieldChatGPT-UserPerplexityBotComparison
cites_sourcesnot_documentedyesdifferent
honours_crawl_delaynot_documentednot_documentedsame
publishes_ip_listyesyessame
purpose_documenteduser_fetchsearchdifferent
reads_llms_txtnot_documentednot_documentedsame
respects_robots_txtpartialyesdifferent
separate_search_and_training_tokensnot_documentednot_documentedsame
user_agent_string_fullMozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/botMozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot)different
verifiable_by_rdnsnot_documentednot_documentedsame

Differences

FieldChatGPT-User statementPerplexityBot statement
cites_sourcesOpenAI does not publish whether ChatGPT responses cite pages fetched by ChatGPT-User.Perplexity links to the websites that PerplexityBot surfaces in Perplexity search results.
purpose_documentedChatGPT-User visits web pages for user actions in ChatGPT and in Custom GPTs.PerplexityBot surfaces and links websites in Perplexity search results.
respects_robots_txtChatGPT-User fetches pages in response to user actions in ChatGPT, and OpenAI states that robots.txt rules may not apply to ChatGPT-User fetches.PerplexityBot honours robots.txt rules that webmasters set for the PerplexityBot token.
user_agent_string_fullChatGPT-User sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot.PerplexityBot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot).

Sources