Short answer
OAI-SearchBot surfaces sites in ChatGPT search; GPTBot collects content that may train OpenAI's models; ChatGPT-User visits pages when a user or custom GPT asks, so robots.txt may not apply; OAI-AdsBot checks ad landing pages and isn't used for training.
Side by side
| Bot | Automatic crawling? | Used for training? | IP list |
|---|---|---|---|
| OAI-SearchBot | Yes | No | openai.com/searchbot.json |
| GPTBot | Yes | Yes | openai.com/gptbot.json |
| ChatGPT-User | No, user-initiated | No | openai.com/chatgpt-user.json |
| OAI-AdsBot | Only submitted ad pages | No | openai.com/adsbot.json |
Questions
Which must B2B sites allow?
OAI-SearchBot for ChatGPT search and OAI-AdsBot if you advertise.
Facts checked against the sources below on 12 October 2026. Platforms change quickly: if something here no longer matches what you see, tell us and we will update it.
