| cites_sources | OpenAI does not publish whether ChatGPT responses cite pages fetched by ChatGPT-User. | not documented |
| honours_crawl_delay | OpenAI does not publish whether ChatGPT-User honours the robots.txt Crawl-delay directive. | Google does not publish any Crawl-delay behaviour for the Google-Extended token. |
| publishes_ip_list | OpenAI publishes the IP address ranges used by ChatGPT-User as a JSON file at https://openai.com/chatgpt-user.json. | Google publishes no IP list for Google-Extended because Google-Extended has no separate HTTP request user agent string. |
| purpose_documented | ChatGPT-User visits web pages for user actions in ChatGPT and in Custom GPTs. | Google-Extended is a standalone product token that controls whether Google uses crawled content to train Gemini models. |
| reads_llms_txt | OpenAI does not publish whether ChatGPT-User reads llms.txt files. | not documented |
| 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. | Google-Extended is a robots.txt token that publishers set to control use of crawled content for Gemini training. |
| robots_token_differs_from_ua | not documented | Google-Extended is a robots.txt control token and does not correspond to a crawler user agent string. |
| separate_search_and_training_tokens | OpenAI does not document ChatGPT-User as a search or training opt-out token. | Google-Extended controls Gemini training use only and does not affect inclusion in Google Search. |
| 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. | not documented |
| verifiable_by_rdns | OpenAI does not publish a reverse-DNS verification method for ChatGPT-User. | Google does not publish a reverse-DNS verification method for Google-Extended. |
| what_it_controls | not documented | Google-Extended controls AI training and grounding in Google systems and does not control Google Search inclusion. |