Model training · Anthropic
ClaudeBot
Anthropic's training crawler. Restricting it tells Anthropic to exclude the site's future content from training datasets. It honours Crawl-delay and does not bypass CAPTCHAs.
- Operator
- Anthropic
- Purpose
- Model training
- Used for
- Anthropic model development
- Obeys robots.txt
- Yes
- robots.txt token
ClaudeBot- User-agent string
- Not published by the operator
- IP list
- Not published
- Official docs
- support.claude.com
- Feeds
- Claude
Block ClaudeBot in robots.txt
User-agent: ClaudeBot
Disallow: /Well-known sites that block ClaudeBot
facebook.com #4, fbcdn.net #7, instagram.com #14, amazon.com #30, whatsapp.net #42, whatsapp.com #66, yahoo.com #72, msn.com #92, t-online.de #129, snapchat.com #157, tumblr.com #160, nytimes.com #163, ebay.com #191, cnn.com #195, theguardian.com #196, medium.com #198, bbc.com #216, sciencedirect.com #224, bbc.co.uk #236, canva.com #276, launchpad.net #281, nature.com #297, amazon.co.uk #326, washingtonpost.com #383
Other Anthropic bots
Claude-SearchBot (ai search index) · Claude-User (user-triggered fetch) · anthropic-ai (model training) · Claude-Web (user-triggered fetch)
Questions
What is ClaudeBot?
ClaudeBot is a model training bot operated by Anthropic, used for Anthropic model development. Anthropic's training crawler. Restricting it tells Anthropic to exclude the site's future content from training datasets. It honours Crawl-delay and does not bypass CAPTCHAs.
How do I block ClaudeBot?
Add "User-agent: ClaudeBot" followed by "Disallow: /" to the robots.txt file at the root of each host you want to protect.
Does ClaudeBot respect robots.txt?
Yes. Anthropic documents that ClaudeBot honours robots.txt directives.
How many websites block ClaudeBot?
In a Oct 29, 2026 analysis of the top 10,000 websites by Kuldeep Paul, 16.9% of sites with a robots.txt file fully disallowed ClaudeBot.
Analysis using this data
- Who blocks AI crawlers? What 10,000 robots.txt files revealPublishers block training, not answers; half of all blocklists leak; Cloudflare writes the most common AI policy.
- The opt-out asymmetry: you can block the small AI engines, not the big oneThe AI surfaces with the most users are the ones publishers can't refuse and can't measure.
How to cite this data
This dataset is free to use, including commercially, under Creative Commons Attribution 4.0. The one rule is attribution:
- Credit the source as “Kuldeep Paul, kuldeep.cc” wherever you use a figure, chart or table from it.
- Link to this page (https://kuldeep.cc/data/ai-search/crawlers/claudebot), not to the download file, so readers can check the source of every number.
- Include the date. These figures change; say “as of Oct 29, 2026” or link to the version you used.
- Mark changes. If you filter, recalculate or chart the data yourself, say so (“analysis based on data from…”).
- Cite the original source for single figures when you quote one reported number; it is linked in every row.
In running text: according to Kuldeep Paul's ClaudeBot — AI crawler directory (kuldeep.cc). More in the methodology.
Paul, K. (2026). ClaudeBot — AI crawler directory [Data set]. kuldeep.cc. https://kuldeep.cc/data/ai-search/crawlers/claudebot
Paul, Kuldeep. "ClaudeBot — AI crawler directory." kuldeep.cc, 29 October 2026, https://kuldeep.cc/data/ai-search/crawlers/claudebot.
Paul, Kuldeep. 2026. "ClaudeBot — AI crawler directory." Dataset. kuldeep.cc. Updated Oct 29, 2026. https://kuldeep.cc/data/ai-search/crawlers/claudebot.
@misc{paul2026claudebot, author = {Paul, Kuldeep}, title = {ClaudeBot — AI crawler directory}, year = {2026}, howpublished = {\url{https://kuldeep.cc/data/ai-search/crawlers/claudebot}}, note = {Dataset, CC BY 4.0, updated 2026-10-29} }
<a href="https://kuldeep.cc/data/ai-search/crawlers/claudebot">ClaudeBot — AI crawler directory</a> (data: Kuldeep Paul, kuldeep.cc)