What do RFC 9309 and the major AI crawler operators' documents say a robots.txt rule does for training and for AI features, and what do they not promise?
RFC 9309 defines robots.txt as a request protocol (not access authorisation) with no AI-specific terms; AI operators publish separate tokens with different stated effects: OpenAI GPTBot (training) vs OAI-SearchBot (search) vs ChatGPT-User (user-initiated; robots.txt may not apply), Google-Extended as a control token with no separate user agent, and Anthropic's three robots. A robots.txt rule is evidence of a stated preference and the operator's stated policy, not of observed crawler behaviour.
RFC 9309 defines robots.txt as a request protocol (not access authorisation) with no AI-specific terms; AI operators publish separate tokens with different stated effects: OpenAI GPTBot (training) vs OAI-SearchBot (search) vs ChatGPT-User (user-initiated; robots.txt may not apply), Google-Extended as a control token with no separate user agent, and Anthropic's three robots. A robots.txt rule is evidence of a stated preference and the operator's stated policy, not of observed crawler behaviour.
Curator qualifications: Specs and vendor pages read 2026-10-22; no crawler logs examined; not legal advice. Common Crawl, Apple, Meta and Perplexity pages (S64-S67) from producer reading.
Limitations: Specs and vendor pages read 2026-10-22; no crawler logs examined; not legal advice. Vendor pages change frequently.
Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.
Structured fields
{
"citations": [
{
"url": "https://www.rfc-editor.org/rfc/rfc9309.txt",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://platform.openai.com/docs/bots",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://developers.google.com/crawling/docs/crawlers-fetchers/google-common-crawlers",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://commoncrawl.org/ccbot",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://support.apple.com/en-us/119829",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://developers.facebook.com/docs/sharing/webmasters/web-crawlers/",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
},
{
"url": "https://docs.perplexity.ai/guides/bots",
"note": "RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live)"
}
]
}Evidence claims
- [sourced_fact] RFC 9309 defines robots.txt as a request protocol (not access authorisation) with no AI-specific terms; AI operators publish separate tokens with different stated effects: OpenAI GPTBot (training) vs OAI-SearchBot (search) vs ChatGPT-User (user-initiated; robots.txt may not apply), Google-Extended as a control token with no separate user agent, and Anthropic's three robots. A robots.txt rule is evidence of a stated preference and the operator's stated policy, not of observed crawler behaviour. · locator: RFC 9309 L100; OpenAI bots page (live); Google common crawlers page (live); Anthropic support article on crawling (live) source
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| documentation | unknown | permitted | permitted | unknown | unknown | Applies to this original summary only, not to the cited sources. |
Linked records
- cites → https://commoncrawl.org/ccbot
- cites → https://developers.facebook.com/docs/sharing/webmasters/web-crawlers
- cites → https://developers.google.com/crawling/docs/crawlers-fetchers/google-common-crawlers
- cites → https://docs.perplexity.ai/guides/bots
- cites → https://platform.openai.com/docs/bots
- cites → https://support.apple.com/en-us/119829
- cites → https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler
- cites → https://www.rfc-editor.org/rfc/rfc9309.txt