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Use separate robots.txt groups: allow Googlebot, then set independent rules for the AI crawlers you want to exclude. In particular, OpenAI distinguishes OAI-SearchBot, which helps surface sites in ChatGPT search, from GPTBot, which may crawl content for foundation-model training. You can therefore keep Google Search crawling while allowing ChatGPT search and disallowing GPTBot—but robots.txt is a voluntary instruction, not a guaranteed access block.
How do I block AI crawlers without blocking Google?
Give Googlebot its own allow group and add separate groups for each AI crawler you want to control. A starting point is:
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Allow: /
User-agent: OAI-SearchBot
Allow: /
User-agent: GPTBot
Disallow: /
User-agent: ClaudeBot
Disallow: /
User-agent: Bytespider
Disallow: /In this example, Googlebot and OAI-SearchBot are allowed to crawl the site, while GPTBot, ClaudeBot, and Bytespider are asked not to crawl it. The rules are deliberately separate: an AI crawler’s rule does not need to determine Googlebot’s access. Google’s robots.txt documentation describes user-agent groups and explicit allowances; OpenAI says its crawler settings are independent.
Treat this as a starting configuration, not a universal blocklist. Choose the tokens that match your policy and the crawler traffic you actually see in server logs. If you want Google Search visibility but not a particular AI service’s search visibility, change that crawler’s group without changing Googlebot’s rule.
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Choose rules by crawler, not by the broad label “AI”
“AI crawler” can mean different things. OpenAI documents separate crawlers for search discovery and potential training use; its names are not interchangeable:
| Crawler token | Documented role | Policy choice |
|---|---|---|
Googlebot |
Google Search’s smartphone and desktop crawlers use this robots.txt token. | Allow it if you want Google to crawl your pages for Search. |
OAI-SearchBot |
OpenAI’s crawler for surfacing sites in ChatGPT search. | Allow or disallow according to whether you want that search visibility. |
GPTBot |
OpenAI’s crawler for content that may be used to train foundation models. | Disallow it if your policy is to exclude that crawler. |
ClaudeBot, PerplexityBot, Bytespider, and others |
Tokens listed in Cloudflare’s bot reference; crawler identities and current tokens should be confirmed before deployment. | Make an individual decision for each token relevant to your site. |
The important distinction is between a crawler’s function and the company or service associated with it. A rule for one token does not automatically express your preference for every other crawler from the same provider. OpenAI explicitly says, “Each setting is independent of the others.”
What is the difference between blocking search visibility and blocking training crawlers?
Search visibility and training exclusion are different goals, so they require different rules. For OpenAI, allowing OAI-SearchBot while disallowing GPTBot is the documented way to permit ChatGPT search crawling while asking the training-related crawler not to access the site.
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Decide what outcome matters before editing the file. If you want Google Search but do not want ChatGPT search discovery, allow Googlebot and disallow OAI-SearchBot. If you want both search services to crawl but want to exclude the training-related crawler, allow Googlebot and OAI-SearchBot and disallow GPTBot. If your policy is to exclude all listed AI crawlers, disallow each one individually while retaining Googlebot’s allow group.
These rules communicate crawler-specific preferences; they do not make a page private or guarantee how a service will use content obtained outside that crawler. For access security, use authentication or network-level controls rather than relying on a robots.txt instruction.
Does robots.txt remove pages from Google Search?
No. Google describes robots.txt as a way to control crawler access, not a reliable way to remove a URL from Search. A blocked URL may still appear in results if other pages link to it, even when Google cannot crawl its contents.
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If your goal is to keep a page out of Google’s index, use a noindex directive or access control instead. A noindex meta tag or X-Robots-Tag response header only works when Googlebot can crawl the response and read that instruction. Disallowing the URL in robots.txt can prevent Google from seeing the very directive intended to remove it.
Match the control to the outcome
| Approach | What it is for | What it does not guarantee |
|---|---|---|
robots.txt |
Expresses crawl preferences to particular user agents, such as allowing Googlebot while disallowing a named AI crawler. | It does not reliably remove a URL from Google Search or stop a non-compliant crawler from requesting content. |
noindex |
Asks search engines not to index a page, through a readable meta tag or X-Robots-Tag header. |
It cannot work for Google if Googlebot is blocked from crawling the response and therefore cannot read the instruction. |
| Authentication or access control | Restricts access to content that should not be publicly available. | It is not the same as a crawler preference; decide separately how public pages should be indexed. |
| WAF or bot-management controls | Can enforce network-level restrictions, rate limits, or blocks for traffic that does not honor robots.txt. | It requires a control configured for the relevant traffic; robots.txt alone does not provide this enforcement. |
Does robots.txt actually stop AI crawlers?
Only if the crawler chooses to honor it. Cloudflare states that “robots.txt compliance is voluntary”: the file expresses a preference, but a crawler that ignores it can still request the content.
For a crawler that does not comply, use a stronger control such as a web application firewall (WAF), bot management, rate limiting, IP rules, or authentication, depending on the traffic and content. Cloudflare documents AI Crawl Control as one option for blocking selected AI crawlers. A static robots.txt file is simpler to maintain, but it is not an access-control mechanism; managed edge controls can enforce restrictions, but they must be configured for the traffic you intend to stop.
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Keep the distinction clear when setting expectations: a robots rule is a crawler instruction, while a WAF or authentication rule can deny a request. If the content must not be accessed by unauthorized visitors or bots, do not publish it openly and rely only on a robots.txt preference.
How do I verify Googlebot and AI crawler behavior?
Check both the rules you published and the requests your server receives. Do not identify a visitor as Googlebot based only on its user-agent string: strings can be spoofed, and Google recommends verifying the source with reverse DNS lookup or by matching it against Google’s published Googlebot IP ranges.
- Review the published rules. Confirm that the Googlebot group allows crawling and that each AI crawler you intend to exclude has its own disallow rule. Check for spelling errors in the user-agent tokens.
- Inspect access logs. Look for requests claiming to come from Googlebot and from the named AI crawlers. Verify claimed Googlebot traffic using reverse DNS or Google’s published IP ranges rather than trusting the user-agent label alone.
- Check Google Search reporting. Watch Search Console crawl and indexing reports for important pages, and confirm that key pages remain crawlable and render for Googlebot.
- Allow for changes to take effect. OpenAI says its search systems may take about 24 hours to adjust after a robots.txt update. Treat that as guidance for its search systems, not as a universal propagation time for every crawler.
- Escalate non-compliance. If a crawler you disallowed continues requesting content, robots.txt has not enforced the block. Apply an appropriate WAF, bot-management, rate-limit, IP, or authentication control.
Verification should distinguish a successful instruction from a successful block. A compliant crawler may stop after reading the file; seeing continued requests means you need to investigate identity and compliance, then decide whether a stronger control is needed.
What should I check before publishing crawler rules?
Review the intended outcome for each crawler rather than copying a list without context. The names of AI crawlers and the traffic reaching your site can change, so use current logs and a current bot reference to decide which tokens belong in the file.
- Google Search: keep an explicit Googlebot allow group if Google crawling should continue.
- ChatGPT search: decide independently whether to allow OAI-SearchBot.
- Potential training crawl: decide independently whether to disallow GPTBot.
- Other AI services: confirm the current token and identity before adding a rule for ClaudeBot, PerplexityBot, Bytespider, or another agent.
- Index removal: use noindex or access control when the objective is to remove a page from Search; do not substitute a crawl disallow.
- Security: use an enforcing control for traffic that must not fetch the content, because robots.txt is voluntary.
- Monitoring: check logs and Search Console after the change, and verify Googlebot’s identity before drawing conclusions about its requests.
Frequently Asked Questions
Can I let ChatGPT search use my site but block GPTBot?
Yes. OpenAI identifies OAI-SearchBot as its search crawler and GPTBot as its crawler for content that may be used to train foundation models, and documents their settings as independent. Choose an allow rule for the search crawler and a disallow rule for GPTBot if that matches your policy.
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Will a disallow rule hide a URL that Google already knows about?
Not necessarily. Google says a disallowed URL can still appear in Search when other pages link to it, because Google may know the URL without being able to crawl its contents.
Why is Google still requesting pages after I added a Googlebot rule?
First verify that the requests really come from Googlebot; user-agent strings can be forged. Google recommends reverse DNS verification or checking the request source against its published Googlebot IP ranges.
How soon does OpenAI respond to a robots.txt change?
OpenAI says its search systems may take about 24 hours to adjust after a site updates robots.txt. That estimate applies to OpenAI search systems, not necessarily to other crawlers.
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