ChatGPT Uses Bing, Not Google. If Your Site Isn't Indexed on Bing, ChatGPT Will Never See You.
This is the technical detail that 90% of articles about AI search optimization forget to mention. You can have the best content in the world, rank on page one of Google, have dozens of quality backlinks... and remain completely invisible to ChatGPT.
Why? Because when a user asks ChatGPT a question with search enabled, the AI doesn't consult Google's index. It relies on Bing's infrastructure to explore the web in real time, retrieve relevant content, and then synthesize a response.
In France, ChatGPT now attracts 18.3 million monthly users according to Mediametrie. With 84% of French AI traffic, it's by far the dominant platform. Every day, thousands of your potential clients ask ChatGPT questions about the services you offer.
This guide goes beyond generic advice about GEO (Generative Engine Optimization). Here, we dive into the technical details: crawler configuration, Bing indexing, structured data, verifying your presence, and content optimization for AI citation.
How ChatGPT Search Actually Works
Before diving into optimizations, you need to understand the mechanics. ChatGPT Search doesn't work like Google at all. The difference is fundamental and shapes your entire strategy.
The Journey of a Query in ChatGPT
When a user asks a question, here's what happens behind the scenes:
- The language model (LLM) analyzes the query and determines if it needs recent information from the web
- ChatGPT queries Bing's index to identify the most relevant content
- Pages are retrieved and analyzed: raw HTML content is extracted (not JavaScript-rendered content)
- The LLM synthesizes a response by combining information from multiple sources
- Sources are cited with clickable links to the pages used
The crucial point: ChatGPT doesn't "read" your site like a human. It breaks your content into chunks and evaluates each chunk independently for its relevance to the question asked. Your content is never read in its entirety.
The Three OpenAI Crawlers You Need to Know
OpenAI uses three distinct bots to explore the web. Each has a different role:
OAI-SearchBot is the dedicated ChatGPT Search crawler. It explores web pages to feed real-time responses. This is the most important one for your visibility.
ChatGPT-User steps in during real-time interactions. When a user asks a question and ChatGPT needs to verify information on your site, this bot handles it.
GPTBot collects training data for OpenAI's models. Blocking GPTBot does not affect your presence in ChatGPT Search. You can block it while remaining visible in responses.
Why Bing Has Become Your Priority
Here's the reality many businesses ignore: if Bing can't see your content, ChatGPT can't either. It's that simple. Most companies focus their SEO efforts exclusively on Google, which makes sense since Google accounts for over 90% of searches. But with the rise of ChatGPT, Bing has become the pillar of AI search optimization.
Technical Checklist: Configuring Your Site for ChatGPT
Step 1: Configure Your robots.txt File
Your robots.txt file determines which bots can access your site. To be visible in ChatGPT, you must explicitly allow OpenAI's crawlers:
- User-agent: OAI-SearchBot - Allow: / (allows the ChatGPT Search crawler)
- User-agent: ChatGPT-User - Allow: / (allows real-time verification)
- User-agent: GPTBot - Disallow: / (optional, blocks training without impacting search)
Important: if your robots.txt contains a Disallow: / rule for all agents (User-agent: *), OpenAI's bots will be blocked. Verify that your general rules don't prevent access.
Step 2: Register Your Site on Bing Webmaster Tools
If you've never configured Bing Webmaster Tools, now is the time:
- Go to bing.com/webmasters and sign in with a Microsoft account
- Add your site as a property
- Verify ownership (via XML file, meta tag, or DNS record)
- Submit your XML sitemap (usually at yoursite.com/sitemap.xml)
- Verify that your important pages are properly indexed
Tip: if your site is already verified in Google Search Console, Bing Webmaster Tools offers a direct import that greatly simplifies the process.
Step 3: Enable IndexNow for Instant Indexing
IndexNow is a real-time indexing protocol supported by Microsoft (Bing) and Yandex. Unlike the traditional process where search engines discover your pages by crawling, IndexNow lets you instantly notify Bing when you publish or update content.
For sites built with Next.js, integration is straightforward. You can use the npm package indexnow-submit or implement an API notification in your deployment pipeline. For WordPress, plugins like Yoast SEO or Rank Math integrate IndexNow natively.
Step 4: Ensure Your Content Is Readable Without JavaScript
This is a critical point, especially for sites built with React, Vue.js, or Angular. OpenAI's bots do not render JavaScript. They only read the raw HTML received from the server.
- A React site with client-side rendering (CSR) only sends an empty <div id="root"></div> to bots. Your content is invisible.
- A site with server-side rendering (SSR) or static site generation (SSG) sends the complete HTML from the first response. Your content is readable.
This is exactly the problem solved by a migration to Next.js with SSR, a topic we regularly help businesses with.
Step 5: Implement Schema.org Structured Data
Schema.org structured data helps AIs understand the context and nature of your content. To maximize your chances of being cited, implement at minimum:
- FAQPage for your Q&A sections
- Article for your blog posts with author, publication and modification dates
- LocalBusiness for your business listing (particularly useful for geolocated queries)
- Organization to strengthen your brand identity in RAG systems
You can validate your structured data with Google's Rich Results Test or the Schema Markup Validator.
How to Check If ChatGPT Already Cites Your Site
Before optimizing, you need to know where you stand. Here are three methods to evaluate your current visibility in ChatGPT.
Method 1: Manual Testing
The most direct method. Open ChatGPT (with web search enabled) and ask the questions your potential clients would ask. Test at least 10 to 15 queries covering your main services.
Note: ChatGPT responses can vary between sessions. Test the same query multiple times on different days for a realistic picture.
Method 2: JSON Export
The most revealing method. When you use ChatGPT with search enabled, you can download the conversation's JSON file. This file contains all URLs consulted by ChatGPT, including those visited but not cited in the final response.
Method 3: Specialized Monitoring Tools
- Ahrefs Brand Radar: tracks your mentions in ChatGPT, Gemini, Perplexity, and Copilot with daily monitoring
- Semrush Enterprise AIO: AI share of voice monitoring, sentiment, and competitive benchmarking
- Google Analytics 4: monitor the utm_source=chatgpt.com parameter in your acquisition reports to measure traffic from ChatGPT
Optimizing Your Content to Be Cited by ChatGPT
Write in "Inverted Pyramid" Style
AIs extract specific passages from your content. The most important information should appear at the beginning of each section, not the end. Think like a journalist: the essential fact first, context second, details after.
Create Self-Contained Paragraphs
Each paragraph should work independently, like a complete answer to a specific question. This is because RAG (Retrieval-Augmented Generation) systems break your pages into chunks and evaluate each chunk separately.
Include Data and Sources
Academic research on GEO confirms: adding statistics and citations to your content improves visibility in AI responses by 28 to 41%. AIs favor content that appears factual and verifiable.
- Cite specific sources ("According to Semrush, AI traffic multiplied by 9 between 2024 and 2025")
- Include quantified data ("78% of pages referenced in ChatGPT exceed 1,500 words")
- Mention recognized studies or organizations to strengthen your credibility
Adopt Question/Answer Format
Queries that trigger ChatGPT Search are increasingly conversational. Structuring your content around real questions is one of the most powerful levers.
Update Your Content Regularly
Freshness is a strong signal for AIs. According to Ahrefs, 79% of lists cited by ChatGPT had been updated during 2025, and 57% had been modified since their initial publication.
The SME Advantage Over Large Sites
Here's reassuring news for small businesses: according to Ahrefs analysis, 35% of lists cited by ChatGPT come from domains with a domain authority below 40. You don't need to be a major publication to appear in ChatGPT's responses.
What matters is relevance, clarity, freshness, and credibility. For a specialized SME, this is a real opportunity. Check out our accessible pricing for professional support.
5-Day Action Plan to Become Visible on ChatGPT
Day 1: Technical Audit
- Check your robots.txt file and add directives for OAI-SearchBot and ChatGPT-User
- Register your site on Bing Webmaster Tools if not done yet
- Submit your XML sitemap to Bing
- Test your main pages' HTML rendering with curl to verify content is accessible without JavaScript
Day 2: Structured Data
- Implement Schema.org schemas (Article, FAQPage, Organization, LocalBusiness) on key pages
- Validate them with the Schema Markup Validator
- Verify that your meta tags (title, description) are properly filled and relevant
Day 3: AI Visibility Audit
- Test 15 queries your potential clients would ask ChatGPT
- Note for each: are you cited? Who appears instead? What content type is favored?
- Identify gaps and opportunities
Day 4: Content Optimization
- Select your 3 to 5 most strategic pages
- Restructure them in inverted pyramid style with self-contained paragraphs
- Add quantified data and sources
- Create or enhance FAQ sections and update modification dates
Day 5: Bing and IndexNow Activation
- Verify indexing of your key pages in Bing Webmaster Tools
- Configure IndexNow so Bing is automatically notified of future publications
- Schedule a monthly reminder to repeat the AI visibility test
Technical Mistakes That Make You Invisible
Blocking bots unknowingly. Many WordPress security plugins or server configurations block unknown bots by default. Verify your firewall (Cloudflare, Sucuri, etc.) isn't intercepting OAI-SearchBot or ChatGPT-User.
Ignoring 404 errors and redirects. OpenAI's bots are less tolerant than Googlebot. A 404 page, a redirect chain, or a slow response time can cause the bot to give up.
Content trapped in JavaScript. The classic trap for React, Vue, or Angular sites without SSR. Your content is perfect for humans but OpenAI's bots see only an empty page.
Pages too slow. ChatGPT Search doesn't have time to wait. If your page takes more than 3 seconds to respond, the bot may abandon it. Optimize your Core Web Vitals and use a CDN if needed.
Going Further: Beyond Your Website
Reddit presence. Reddit has become one of the most cited sources by generative AIs (+87% in 2025). Actively participate in relevant subreddits with useful, expert responses.
Bing Places / Google Business Profile. For local queries, business listings are key sources, as detailed in our local SEO guide.
Third-party mentions. ChatGPT values your brand mentions on authority sites. Press articles, interviews, and citations in specialized blogs strengthen your perceived credibility.
YouTube video content. Studies show YouTube has a strong correlation with visibility in generative AIs. Create videos on your areas of expertise.
Conclusion: The Window of Opportunity Is Now
Right now, 90% of websites never appear in ChatGPT. Most businesses haven't even configured Bing Webmaster Tools. Competition in the AI space is still far lower than on Google.
That's exactly why businesses acting now are gaining a considerable head start. The earlier you're cited, the more ChatGPT considers you a reliable source, and the more it will cite you in the future. It's a snowball effect.
Need help configuring your site for ChatGPT visibility? Let's talk. This is exactly the type of technical challenge we solve at WebCraft Dev, at the intersection of web development and AI search optimization.
Sources and References
- Abondance / Oncrawl, "How to Appear on ChatGPT", webinar May 2025
- Mediametrie, Website and App Rankings in France, May 2025
- Semrush, AI Websites Traffic Data France, December 2025
- Ahrefs, Analysis of 26,000 ChatGPT Source URLs, 2025
- Aggarwal et al., GEO: Generative Engine Optimization, ACM SIGKDD 2024
- Profound, AI Citation Tracking Data, August 2025
- BrightEdge Generative Parser, Conversational Query Data, 2025
- OpenAI, Crawler Documentation, 2025
- Microsoft, IndexNow Protocol, 2025
- Writesonic, Organic Ranking vs AI Overview Citation Correlation, August 2025
