# ChatGPT-User vs Google-Extended

ChatGPT-User and Google-Extended compared on 11 documented fields, from 17 claims, last verified 2026-09-13.

| Field | ChatGPT-User | Google-Extended | Comparison |
| --- | --- | --- | --- |
| cites_sources | not_documented | not documented | different |
| honours_crawl_delay | not_documented | n/a | different |
| publishes_ip_list | yes | no | different |
| purpose_documented | user_fetch | policy_only | different |
| reads_llms_txt | not_documented | not documented | different |
| respects_robots_txt | partial | n/a | different |
| robots_token_differs_from_ua | not documented | yes | different |
| separate_search_and_training_tokens | not_documented | yes | different |
| user_agent_string_full | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot | not documented | different |
| verifiable_by_rdns | not_documented | n/a | different |
| what_it_controls | not documented | Gemini model training and grounding, not Search inclusion | different |

## Differences

| Field | ChatGPT-User statement | Google-Extended statement |
| --- | --- | --- |
| 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. |

## Sources

- https://developers.google.com/search/docs/appearance/ai-features
- https://developers.google.com/search/docs/crawling-indexing/google-common-crawlers
- https://developers.openai.com/api/docs/bots
- https://openai.com/chatgpt-user.json