# 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). |

## Sources

- https://developers.openai.com/api/docs/bots
- https://docs.perplexity.ai/docs/resources/perplexity-crawlers
- https://openai.com/chatgpt-user.json
- https://www.perplexity.ai/perplexity-user.json