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Websites can block AI training by disallowing crawlers

Websites can now block AI training crawlers such as GPTBot while remaining discoverable to search indexers by configuring granular robots.txt rules and HTTP headers, according to Cloudflare. Google-Extended separately lets sites allow Googlebot for search discovery while disallowing use of their content for Gemini and Vertex AI training. The change means engineering teams running production RAG and agentic scraping pipelines must pivot to API-first data retrieval or navigate restricted crawler permissions, since "publicly indexable" is no longer a sufficient permission signal.

read1 min views3 publishedSep 16, 2026
Websites can block AI training by disallowing crawlers
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Websites can block AI training by disallowing crawlers

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Websites can now block AI training crawlers like GPTBot while remaining fully discoverable to search indexers by configuring granular robots.txt and HTTP headers. For production RAG and agentic scraping pipelines, this will drastically reduce the volume of high-quality, real-time data accessible via standard web scraping. To maintain data ingestion pipelines, engineering teams must now pivot to API-first data retrieval or navigate highly-restricted crawler permissions.

Google-Extended lets sites allow Googlebot for search discovery while separately disallowing use of their content for Gemini/Vertex AI training. For production LLM crawlers and agents, “publicly indexable” is no longer a sufficient permission signal; you need purpose-specific crawler identity and policy enforcement or your training pipeline will ingest content that publishers explicitly opted out of.

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