Rattlesnakes By Mail

Google-Extended vs GPTBot

Google-Extended and GPTBot compared on 10 documented fields, from 16 claims, last verified 2026-09-13.

FieldGoogle-ExtendedGPTBotComparison
honours_crawl_delayn/anot_documenteddifferent
publishes_ip_listnoyesdifferent
purpose_documentedpolicy_onlytrainingdifferent
respects_robots_txtn/ayesdifferent
robots_token_differs_from_uayesnot documenteddifferent
robots_txt_fetch_markernot documentedyesdifferent
separate_search_and_training_tokensyesyessame
user_agent_string_fullnot documentedMozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; GPTBot/1.4; +https://openai.com/gptbotdifferent
verifiable_by_rdnsn/anot_documenteddifferent
what_it_controlsGemini model training and grounding, not Search inclusionnot documenteddifferent

Differences

FieldGoogle-Extended statementGPTBot statement
honours_crawl_delayGoogle does not publish any Crawl-delay behaviour for the Google-Extended token.OpenAI does not publish whether GPTBot honours the robots.txt Crawl-delay directive.
publishes_ip_listGoogle publishes no IP list for Google-Extended because Google-Extended has no separate HTTP request user agent string.OpenAI publishes the IP address ranges used by GPTBot as a JSON file at https://openai.com/gptbot.json.
purpose_documentedGoogle-Extended is a standalone product token that controls whether Google uses crawled content to train Gemini models.GPTBot crawls content that may be used to train OpenAI generative AI foundation models.
respects_robots_txtGoogle-Extended is a robots.txt token that publishers set to control use of crawled content for Gemini training.GPTBot honours robots.txt rules that webmasters set for the GPTBot token.
robots_token_differs_from_uaGoogle-Extended is a robots.txt control token and does not correspond to a crawler user agent string.not documented
robots_txt_fetch_markernot documentedOpenAI may add a robots.txt marker to the GPTBot user agent string when GPTBot fetches robots.txt files.
user_agent_string_fullnot documentedGPTBot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; GPTBot/1.4; +https://openai.com/gptbot.
verifiable_by_rdnsGoogle does not publish a reverse-DNS verification method for Google-Extended.OpenAI does not publish a reverse-DNS verification method for GPTBot.
what_it_controlsGoogle-Extended controls AI training and grounding in Google systems and does not control Google Search inclusion.not documented

Sources