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robots txt fetch marker across crawlers

robots txt fetch marker across 1 crawlers from 1 vendors, from 1 claims, last verified 2026-09-13.

How the crawlers answer this one question, counted by answer. Every answer links to the vendor quote behind it.

Robots txt fetch markerRobots txt fetch marker. not documented is the largest with 14 crawlers, out of 15 crawlers in total.not documented: 14 crawlersnot documented14yes: 1 crawleryes1
Robots txt fetch marker. not documented is the largest with 14 crawlers, out of 15 crawlers in total. Source: each vendor's own crawler documentation, quoted and dated on every claim page.
CrawlerVendorValueMethodVerifiedClaim
GPTBotOpenAIyesvendor_doc2026-09-13claim 85

Not documented

CrawlerVendor
Claude-SearchBotAnthropic
Claude-UserAnthropic
ClaudeBotAnthropic
ApplebotApple
Applebot-ExtendedApple
Google-ExtendedGoogle
GoogleOtherGoogle
GooglebotGoogle
BingbotMicrosoft
ChatGPT-UserOpenAI
OAI-AdsBotOpenAI
OAI-SearchBotOpenAI
Perplexity-UserPerplexity
PerplexityBotPerplexity

Sources

Source
https://developers.openai.com/api/docs/bots