Yes — AI engines almost certainly use your website, in one or both of two ways: as part of the training data models learned from, and as a page they retrieve live when answering a query. The question worth asking isn’t whether they use it, but how well your site serves both purposes.
The two ways AI uses your website
1. Training data
When AI models are built, they ingest a huge slice of the public web. If your site was crawlable and public, its content likely contributed to what models “know” — including about your brand and topic. This influence is durable but bounded by each model’s knowledge cutoff.
2. Live retrieval
Many engines now fetch live web pages to ground answers — Perplexity on almost every query, ChatGPT and Gemini when they browse, Copilot via Bing. When this happens, your current pages can be read and cited directly. This is fast-moving: publish today, influence answers soon.
How to tell if AI is using your site
- Check your crawler access. Review your
robots.txtand server logs for AI crawler user agents (GPTBot, PerplexityBot, Google-Extended, and others). See the AI crawlers guide. - Ask the engines. Pose questions your pages answer and see whether the engine cites you or reflects your content. If Perplexity cites your URL, it’s using your site.
- Look for your facts. If an engine repeats specific facts or phrasing that originate on your site, your content is in play.
How to make your website work for AI
- Stay crawlable. Don’t accidentally block beneficial crawlers; ensure key content renders without scripts retrieval can’t read.
- Answer questions clearly. Direct, well-structured answers are easier to extract and cite. See does ChatGPT cite websites.
- Publish attributable facts. Specific, sourceable data is the most citable content.
- Add an llms.txt. Give AI a curated map of your key pages — see what is llms.txt.
- Keep it fresh. Current content wins in retrieval-based engines.
“AI crawler” is not one thing — and that changes your answer
The most common mistake here is treating every AI user agent as the same decision. It isn’t. OpenAI alone documents three separate agents with three different jobs, and gives you independent robots.txt control over each:
| Agent | What it does | What blocking it costs you |
|---|---|---|
GPTBot |
Crawls public pages that may be used to train foundation models | Training influence, over model releases |
OAI-SearchBot |
Builds the index ChatGPT search retrieves and cites from | Your ability to appear as a cited source in ChatGPT |
ChatGPT-User |
Fetches a page because a user’s question triggered it | The live fetch behind a specific answer |
Those three are genuinely separable. You can disallow GPTBot — declining to contribute to training — while allowing OAI-SearchBot, so ChatGPT can still surface and link you. Plenty of publishers who “blocked OpenAI” in 2023 blocked only GPTBot, and are now unclear why they still appear in ChatGPT answers; that is the reason. OpenAI also notes it can take roughly 24 hours from a robots.txt change for its search systems to reflect it, so don’t judge a change the same afternoon.
Other operators split the same way. Google separates Google-Extended (Gemini and Vertex training) from Googlebot, so blocking one does not remove you from Search. Anthropic runs ClaudeBot; Perplexity runs PerplexityBot for indexing and Perplexity-User for live user-triggered fetches; Apple splits Applebot-Extended out of Applebot for the same reason. A single blanket Disallow across all of them is a much larger decision than most sites intend to make.
Confirming it, rather than assuming it
Server logs settle the question, but a user agent string is free text that anyone can send — so a raw log grep tells you what something claimed to be. Reverse-DNS verification (resolving the requesting IP back to the operator’s own domain, then forward again) is what separates a real GPTBot hit from a scraper wearing its name. AI Traffic does that check on ingested logs and reports crawls per bot per day alongside the referral sessions those same engines send, so you can see the ratio between “read heavily” and “referred never” rather than inferring it.
A note on control
You can decide whether to allow AI crawlers (via robots.txt directives like Google-Extended and GPTBot), but blocking them means forgoing the visibility that comes with being used. Most brands benefit from being included and instead focus on making their content accurate, authoritative, and easy to use well.
Frequently Asked Questions
Do AI models train on my website?
If your site is public and crawlable, its content has likely contributed to AI training data, influencing what models know about your brand and topic. This effect is durable but limited by each model’s knowledge cutoff.
How do I know if AI crawlers visit my site?
Check your server logs and robots.txt for AI crawler user agents such as GPTBot, PerplexityBot, and Google-Extended. Their presence indicates AI systems are accessing your content.
Can I stop AI from using my website?
You can disallow specific AI crawlers in robots.txt (for example, GPTBot or Google-Extended). However, blocking them forfeits the visibility that comes from being included in AI answers, so weigh the trade-off carefully.
How do I make my website more useful to AI?
Keep it crawlable and fresh, answer questions directly and clearly, publish specific attributable facts, and add an llms.txt that maps your key pages. These make your site easier for AI to use and cite accurately.