ChatGPT-User vs Perplexity-User

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

Field	ChatGPT-User	Perplexity-User	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	user_fetch	same
reads_llms_txt	not_documented	not_documented	same
respects_robots_txt	partial	no	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; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)	different
verifiable_by_rdns	not_documented	not_documented	same

Differences

Field	ChatGPT-User statement	Perplexity-User statement
cites_sources	OpenAI does not publish whether ChatGPT responses cite pages fetched by ChatGPT-User.	Perplexity includes a link to each page that Perplexity-User visits in the Perplexity response.
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.	Perplexity-User ignores robots.txt rules because a user requests each Perplexity-User fetch.
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.	Perplexity-User sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user).