AI crawler access · phys.org
Does phys.org block GPTBot and other AI crawlers?
GPTBot: partially blockedAs of 2026-10-03, the robots.txt of phys.org blocks 0 of 29 AI crawlers on the home page and partially blocks 7 more: GPTBot is partially blocked, ClaudeBot is partially blocked and PerplexityBot is allowed.
- Policy: Open (No listed AI crawler is blocked on the home page)
- AI search access: 100% 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://phys.org/robots.txt - llms.txt: yes
- Content-Signal: none
- Category: Other · domain: .org · popularity band: Tranco 1001-3000
- Last checked: (daily)
All 29 AI crawlers on phys.org
Status for the home page (/) under phys.org's robots.txt. Partially blocked = home page allowed, some paths disallowed.
| Crawler | Operator | robots.txt |
|---|---|---|
| Training crawlers | ||
| GPTBot | OpenAI | partial |
| ClaudeBot | Anthropic | partial |
| Google-Extended | partial | |
| Applebot-Extended | Apple | partial |
| Meta-ExternalAgent | Meta | allowed |
| Amazonbot | Amazon | allowed |
| MistralAI-Training | Mistral | allowed |
| CCBot | Common Crawl | partial |
| Bytespider | ByteDance | partial |
| cohere-ai | Cohere | partial |
| AI search crawlers | ||
| OAI-SearchBot | OpenAI | allowed |
| Claude-SearchBot | Anthropic | allowed |
| PerplexityBot | Perplexity | allowed |
| Google-CloudVertexBot | allowed | |
| Applebot | Apple | allowed |
| meta-webindexer | Meta | allowed |
| Amzn-SearchBot | Amazon | allowed |
| DuckAssistBot | DuckDuckGo | allowed |
| MistralAI-Index | Mistral | allowed |
| User-triggered fetch crawlers | ||
| ChatGPT-User | OpenAI | allowed |
| 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=6685). Across all 8,357 readable sites: 12% block GPTBot. All other sites →
On .org domains: 11.1% of 514 readable sites block GPTBot and 8.6% serve an llms.txt. All .org sites →
History
No change recorded since daily tracking started on 2026-10-02. We re-check phys.org every day; a change in its AI crawler rules shows up here and on the index page.
FAQ
- Does phys.org block GPTBot?
- Partly. As of 2026-10-03, https://phys.org/robots.txt allows GPTBot (OpenAI's AI training crawler) on the home page but disallows some paths.
- Does phys.org block ClaudeBot?
- Partly. As of 2026-10-03, https://phys.org/robots.txt allows ClaudeBot (Anthropic's AI training crawler) on the home page but disallows some paths.
- Does phys.org block PerplexityBot?
- No. As of 2026-10-03, https://phys.org/robots.txt allows PerplexityBot, Perplexity's AI search crawler, on the home page.
- Can ChatGPT search (OAI-SearchBot) crawl phys.org?
- No. As of 2026-10-03, https://phys.org/robots.txt allows OAI-SearchBot, OpenAI's AI search crawler, on the home page.
- Does phys.org block Google-Extended (Gemini training)?
- Partly. As of 2026-10-03, https://phys.org/robots.txt allows Google-Extended (Google's AI training crawler) on the home page but disallows some paths.
- Does phys.org have an llms.txt file?
- Yes. phys.org serves a plain-text /llms.txt file (checked 2026-10-03).
- How can I check phys.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.
Similar .org sites
- aarp.org Blocks training only
- centos.org Open
- ilo.org Open
- iop.org Open
- undp.org Open
- joomla.org Open
- rsc.org Open
- userway.org Open
- cpan.org Open
- ntppool.org Open
- ohchr.org No robots.txt
- drpc.org Open
All sites with an llms.txt · Which .org sites block GPTBot · What is phys.org built with? (Tech Stack Index)