AI crawler access · nejm.org
Does nejm.org block GPTBot and other AI crawlers?
GPTBot: blockedAs of 2026-10-02, the robots.txt of nejm.org blocks 5 of 29 AI crawlers on the home page and partially blocks 1 more: GPTBot is blocked, ClaudeBot is allowed and PerplexityBot is blocked.
- Policy: Blocks some AI search (At least one AI search or assistant crawler blocked)
- AI search access: 88% of the AI search and assistant crawlers we track may fetch the home page (these decide whether AI answers can cite the site).
- robots.txt: found at
https://nejm.org/robots.txt - llms.txt: no
- Content-Signal: none
- Category: Other · domain: .org · popularity band: Tranco 1001-3000
- Last checked: (daily)
All 29 AI crawlers on nejm.org
Status for the home page (/) under nejm.org's robots.txt. Partially blocked = home page allowed, some paths disallowed.
| Crawler | Operator | robots.txt |
|---|---|---|
| Training crawlers | ||
| GPTBot | OpenAI | blocked |
| ClaudeBot | Anthropic | allowed |
| Google-Extended | blocked | |
| Applebot-Extended | Apple | allowed |
| Meta-ExternalAgent | Meta | allowed |
| Amazonbot | Amazon | allowed |
| MistralAI-Training | Mistral | allowed |
| CCBot | Common Crawl | blocked |
| Bytespider | ByteDance | allowed |
| cohere-ai | Cohere | allowed |
| AI search crawlers | ||
| OAI-SearchBot | OpenAI | allowed |
| Claude-SearchBot | Anthropic | allowed |
| PerplexityBot | Perplexity | blocked |
| Google-CloudVertexBot | allowed | |
| Applebot | Apple | partial |
| meta-webindexer | Meta | allowed |
| Amzn-SearchBot | Amazon | allowed |
| DuckAssistBot | DuckDuckGo | allowed |
| MistralAI-Index | Mistral | allowed |
| User-triggered fetch crawlers | ||
| ChatGPT-User | OpenAI | blocked |
| Claude-User | Anthropic | allowed |
| Perplexity-User | Perplexity | allowed |
| Google-GeminiNotebook | allowed | |
| Google-Agent | allowed | |
| meta-externalfetcher | Meta | allowed |
| Amzn-User | Amazon | allowed |
| MistralAI-User | Mistral | allowed |
| Ads review crawlers | ||
| OAI-AdsBot | OpenAI | allowed |
| meta-externalads | Meta | allowed |
Compared with other other sites in the index: 11.6% of them block GPTBot and 10.4% block ClaudeBot (n=6693). Across all 8,366 readable sites: 12% block GPTBot. All other sites →
On .org domains: 11.3% of 514 readable sites block GPTBot and 8.8% serve an llms.txt. All .org sites →
History
No change recorded since daily tracking started on 2026-10-02. We re-check nejm.org every day; a change in its AI crawler rules shows up here and on the index page.
FAQ
- Does nejm.org block GPTBot?
- Yes. As of 2026-10-02, https://nejm.org/robots.txt disallows the home page for GPTBot, OpenAI's AI training crawler.
- Does nejm.org block ClaudeBot?
- No. As of 2026-10-02, https://nejm.org/robots.txt allows ClaudeBot, Anthropic's AI training crawler, on the home page.
- Does nejm.org block PerplexityBot?
- Yes. As of 2026-10-02, https://nejm.org/robots.txt disallows the home page for PerplexityBot, Perplexity's AI search crawler.
- Can ChatGPT search (OAI-SearchBot) crawl nejm.org?
- No. As of 2026-10-02, https://nejm.org/robots.txt allows OAI-SearchBot, OpenAI's AI search crawler, on the home page.
- Does nejm.org block Google-Extended (Gemini training)?
- Yes. As of 2026-10-02, https://nejm.org/robots.txt disallows the home page for Google-Extended, Google's AI training crawler.
- Does nejm.org have an llms.txt file?
- No. As of 2026-10-02, nejm.org does not serve a plain-text /llms.txt file.
- How can I check nejm.org or my own site again?
- Use the free AI crawler checker at tools.yukai.uk/free/ai-crawler-checker (no sign-up). To check many sites and get alerts when rules change, use the AI Crawler Access Checker on Apify.
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