# ChatGPT-User vs PerplexityBot

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

| Field | ChatGPT-User | PerplexityBot | 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 | search | different |
| reads_llms_txt | not_documented | not_documented | same |
| respects_robots_txt | partial | yes | 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; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot) | different |
| verifiable_by_rdns | not_documented | not_documented | same |

## Differences

| Field | ChatGPT-User statement | PerplexityBot statement |
| --- | --- | --- |
| cites_sources | OpenAI does not publish whether ChatGPT responses cite pages fetched by ChatGPT-User. | Perplexity links to the websites that PerplexityBot surfaces in Perplexity search results. |
| purpose_documented | ChatGPT-User visits web pages for user actions in ChatGPT and in Custom GPTs. | PerplexityBot surfaces and links websites in Perplexity search results. |
| 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. | PerplexityBot honours robots.txt rules that webmasters set for the PerplexityBot token. |
| 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. | PerplexityBot sends the user agent string Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot). |

## 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/perplexitybot.json