ChatGPT-User vs PerplexityBot

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

Field	ChatGPT-User	PerplexityBot	Comparison
cites_sources	not_documented	yes	different
honours_crawl_delay	not_documented	not_documented	same
publishes_ip_list	yes	yes	same
purpose_documented	user_fetch	search	different
reads_llms_txt	not_documented	not_documented	same
respects_robots_txt	partial	yes	different
separate_search_and_training_tokens	not_documented	not_documented	same
user_agent_string_full	Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot	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	ChatGPT-User statement	PerplexityBot statement
cites_sources	OpenAI 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_documented	ChatGPT-User visits web pages for user actions in ChatGPT and in Custom GPTs.	PerplexityBot surfaces and links websites in Perplexity search results.
respects_robots_txt	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.	PerplexityBot honours robots.txt rules that webmasters set for the PerplexityBot token.
user_agent_string_full	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.	PerplexityBot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot).