AskEO grades websites for AI search visibility in about 30 seconds, and one gap it flags constantly is a site that ranks well on Google but never shows up when someone asks ChatGPT the same question. The reason is structural, not a ranking problem. Bing Webmaster Tools is the free Microsoft service that lets you submit your sitemap directly to the index that ChatGPT Search actually reads from. If your pages are missing from Bing, they are effectively invisible to ChatGPT's search feature no matter how well they rank in Google.
That gap costs real traffic. Search behavior is shifting toward asking an assistant directly instead of scanning ten blue links, and a site absent from Bing's index has no path into that answer. The fix is mechanical, not creative: verify ownership, submit a sitemap, and confirm your crawlers are allowed in. This guide walks through each step and where AI crawler access commonly breaks.
Why Does ChatGPT Search Run on Bing's Index?
ChatGPT Search licenses its live web results from Bing rather than crawling and ranking the web on its own. When you ask ChatGPT a question that needs current information, it queries Bing's index, retrieves candidate pages, and has the model summarize and cite them.
This is why a page can rank third on Google and appear nowhere in a ChatGPT Search answer for the identical query. Two separate indexes, two separate crawlers, two separate sets of rules. OpenAI's own retrieval crawler for search, OAI-SearchBot, and Bing's crawler, Bingbot, both need to reach your pages before either index can pick them up, and neither one is guaranteed just because Googlebot already has access.
Google runs a comparable arrangement for its own AI features. Google-Extended controls whether Gemini and AI Overviews can use a page, and it is tracked separately from the regular Googlebot entry that governs classic search rankings. The pattern repeats across every AI answer engine: the crawler that built your organic ranking is rarely the same crawler an AI assistant reads from, so each one needs its own explicit permission.
How Do You Set Up a Bing Webmaster Tools Account?
Setting up the account itself takes a few minutes. The steps below get your sitemap in front of Bing's crawler and your priority pages queued for indexing.
- Go to Bing Webmaster Tools and sign in with a Microsoft account.
- Add your site by entering its full URL, or import verified properties directly from an existing Google Search Console connection.
- Verify ownership using the XML meta tag, a DNS TXT record, or an uploaded verification file.
- Open the Sitemaps section and submit your XML sitemap so Bing can discover every page at once instead of one at a time.
- Use URL Inspection to request indexing for your five or six highest-value pages first.
- Check Crawl Control to confirm Bingbot is not being rate-limited or blocked by a hosting-level firewall rule.
Most of that list is a one-time setup. The sitemap resubmission and URL inspection steps are the ones worth repeating after any major content update.
Which AI Crawlers Should Your robots.txt Allow?
Your robots.txt file needs an explicit Allow line for each crawler you want reaching your content, not just the absence of a Disallow. Several page builders and security plugins block all non-Google bots by default until you opt in, which silently removes a site from every AI answer engine at once.
| Crawler | Operator | Feeds |
|---|---|---|
| Bingbot | Microsoft | Bing's search index, and by extension ChatGPT Search |
| OAI-SearchBot | OpenAI | Live ChatGPT Search retrieval |
| GPTBot | OpenAI | Model training data, not live search |
| PerplexityBot | Perplexity | Perplexity's own answer index |
| Google-Extended | Gemini and AI Overviews |
OpenAI publishes the exact user-agent strings and IP ranges for its bots in its own crawler documentation, which is the source to check against if you are unsure which lines your robots.txt actually needs.
Checking five different user agents against your robots.txt by hand, across every template your site uses, is exactly the kind of check that gets skipped after the first audit. AskEO's scan reads your live robots.txt, flags any crawler your site is currently blocking, and lists the exact Allow line to add for each one. Run a free AskEO audit to see which of these crawlers your site blocks right now.
Is Bing Optimization Worth It If You Already Rank on Google?
Yes, because Google ranking data does not transfer to Bing automatically. Bing crawls and scores pages independently, so a page absent from Bing's index stays invisible to ChatGPT Search even while it sits on page one of Google.
The honest objection is that Bing's own search market share is small, so why spend time on it. The answer is that Bing's index now feeds more than Bing.com: ChatGPT Search, Microsoft Copilot, and parts of several other AI assistants all draw from the same underlying index. Optimizing for Bing once buys visibility across all of them, not just one search box.
Get Your Site Ready for ChatGPT Search
Verify your site in Bing Webmaster Tools, submit your sitemap, and confirm Bingbot and OAI-SearchBot are both allowed before you request indexing, otherwise you are submitting pages a crawler cannot actually reach. Create a free AskEO account and run a homepage audit first — it takes under a minute and shows exactly which of these crawlers can already reach your pages. Sign up free and fix any blocked crawler before you submit anything to Bing.
More setup guides like this one live on the AskEO blog, and the free homepage scanner is the fastest way to see where your own site currently stands.
Frequently Asked Questions
Does ChatGPT Search really use Bing instead of its own index?
Yes. ChatGPT Search retrieves live web results through Bing rather than maintaining its own independent crawl and ranking system. This means a page has to be indexed by Bing, and reachable by OpenAI's OAI-SearchBot, before it can appear in a ChatGPT Search answer, regardless of how it ranks on Google.
How long does it take for Bing to index a new page?
There is no fixed timeline, but submitting a sitemap and requesting indexing through URL Inspection speeds things up compared to waiting for Bingbot to discover a page on its own. Well-structured sites with a clean sitemap and no crawl errors tend to see new pages picked up faster than sites Bing has to fully re-crawl.
Do I need to block GPTBot if I do not want my content used for AI training?
Yes, if that is your goal. GPTBot feeds OpenAI's model training data and is separate from OAI-SearchBot, which handles live ChatGPT Search retrieval. You can disallow GPTBot in robots.txt while still allowing OAI-SearchBot, which keeps your pages eligible for ChatGPT Search citations without contributing to training data.
Can I submit a site to Bing Webmaster Tools without a Microsoft account?
No. Bing Webmaster Tools requires signing in with a Microsoft account before you can add or verify a site. The account itself is free to create, and once you are signed in you can import already-verified properties directly from an existing Google Search Console connection instead of re-verifying from scratch.
Does AskEO check Bing indexing status directly?
AskEO's audit checks whether your robots.txt allows the crawlers that feed Bing and ChatGPT Search, along with your meta tags, structured data, and Core Web Vitals. It does not query Bing's index directly, so pair an AskEO audit with the Bing Webmaster Tools dashboard to confirm actual indexing status after submission.