How to optimize for ChatGPT: LLMs.txt doesn’t matter but brand mentions on Quora and Reddit do

SEO and Content Marketing Expert at SE Ranking specializing in industry research around SEO and AI trends. Reviewed by SEO Research Analyst specializing in data-driven SEO analysis, experiments, and industry studies.

Nov 24, 2025
18 min read

When it comes to ChatGPT citations, the internet is full of bold claims. Some swear by LLMs.txt, others by domain authority, recency of content, and even structured metadata like schema markup. But which of these actually matter?

To separate facts from speculation, we ran a new research study analyzing 129,000 unique domains and 216,524 pages across 20 niches to identify citation patterns in ChatGPT’s AI responses.

Understanding the rules of AI citations, however, is one thing. Seeing how you’re doing under those rules is another. That’s where the ChatGPT Visibility Tracker comes in. It gives you a direct view into how ChatGPT treats your brand by allowing you to:

• Check how ChatGPT answers your target queries
• Monitor when and where your brand appears in ChatGPT responses
• Compare your brand’s presence to your competitors’
• Track your ChatGPT visibility changes over time

By combining ChatGPT research insights with ongoing visibility tracking, you’re not just learning why citations happen. You’re gaining the ability to observe, evaluate, and improve your presence in ChatGPT over time.

With that context in place, let’s look at what the data reveals about the signals that actually influence ChatGPT citations.

Key takeaways

• Strengthen your overall domain authority.
  Sites with over 32K referring domains are 3.5x more likely to be cited by ChatGPT than those with up to 200 referring domains. This pattern also holds for Domain Trust (DT): high-trust domains (DT > 90) earn almost 4x more citations than low-trust sites (DT < 43).

• Grow your visibility in traditional Google search (traffic + average ranking position).
  Sites with over 190K monthly visitors receive nearly twice as many ChatGPT citations as domains with lower traffic (let’s say 20 or 20K visitors). Similarly, pages with average ranking position from 1 to 45 get around 60% more citations than pages ranked 64–75.

• Ensure your homepage attracts high organic traffic.
  It’s not traffic to random pages that matters: global traffic to the homepage drives the highest citations. Sites with at least 7.9K organic visitors to their main page have about twice the chance of being cited compared with sites receiving up to 400 visitors.

• Build your presence on Quora and Reddit.
  Domains with millions of brand mentions on Quora and Reddit have roughly 4x higher chances of being cited than those with minimal activity. For smaller, less-established websites, engaging on Quora and Reddit offers a way to build authority and earn trust from ChatGPT, similar to what larger domains achieve through backlinks and high traffic.

• Produce comprehensive, in-depth content (at least 1,900 words for most topics).
  Articles over 2,900 words average 5.1 citations, while those under 800 get 3.2. For smaller domains, content length has roughly 65% more impact on ChatGPT citations than it does for top domains.

• Structure your content for readability and clarity.
  Organize your content into sections of 120–180 words between headings. Pages with this structure receive, on average, 70% more ChatGPT citations than pages with sections under 50 words.

• Keep your content fresh with regular updates.
  Content updated in the past three months averages 6 citations versus 3.6 for outdated pages. So, by refreshing existing articles quarterly with new statistics, examples, or sections, you can nearly double your chances of being cited by ChatGPT.

• Integrate question-based titles and H1s within your content.
  This is especially important for smaller domains, where question-based titles have almost 7x more impact on citations compared to top domains. Plus, the presence of FAQ sections within the main content nearly doubles your chances of being cited by ChatGPT.

• Yet, treat FAQ schema markup as optional, not essential.
  Our data shows pages with FAQ schema average 3.6 citations, while those without reach 4.2. This means that schema alone does not significantly increase ChatGPT citation likelihood.

• Use URLs and titles that convey the overall topic (rather than narrowly targeting a single keyword).
  Broad titles and URLs that simply describe the main topic receive over 2x citations on average, compared to highly keyword-optimized ones. This shows that clarity and topic alignment matter more to AI models than strict keyword optimization.

• Claim and maintain profiles on review platforms.
  Domains with profiles on platforms like Trustpilot, G2, Capterra, Sitejabber, and Yelp have 3x higher chances to be chosen by ChatGPT as a source, compared to sites without such presence.

• Optimize Core Web Vitals: INP, FCP, LCP, and Speed Index.
  For example, pages with FCP under 0.4 seconds average 6.7 citations, while slower pages (over 1.13 seconds) drop to just 2.1. This means that fast-loading pages are 3 times more likely to be cited by ChatGPT compared to slower ones.

• Don’t rely solely on LLMs.txt files.
  Including LLMs.txt has shown negligible impact on ChatGPT citation likelihood. Our analysis even suggests that removing it improved predictive accuracy, so it shouldn’t be a focus for AI visibility.

Top 20 factors affecting ChatGPT citations

In our study of what drives ChatGPT to cite a website, we found a range of factors that impact citation likelihood.

At the top of the list is the number of referring domains. The more diverse websites link to your content, the more likely ChatGPT is to treat it as credible. Right behind that is domain traffic: high visitor numbers signal authority, credibility, and broad relevance.

But authority isn’t just about links and visitors. Page and Domain Trust scores play a critical role. Technical performance also makes a difference. Pages that load quickly are more likely to get attention.

Content structure and depth are equally important. Longer articles, FAQ or Q&A sections, and question-based titles and headers all correlate with higher citation likelihood. And while brand-new content isn’t always favored, keeping content fresh and regularly updated helps maintain relevance over time.

Even social signals matter. Sites that are actively mentioned or discussed on platforms like Quora and Reddit enjoy a higher chance of being cited on ChatGPT.

Taken together, these factors show that ChatGPT citations rely on a combination of technical optimization, authoritative content, social proof, and user-friendly experience.

Key tactics to improve your ChatGPT visibility

Now, let’s break down these ranking factors into actionable strategies so you can improve your chances of being cited by AI systems like ChatGPT.

Boost your website’s authority

According to our analysis, building authority is key to getting cited by ChatGPT. Among all factors, backlinks remain the strongest signal of trust and credibility. Specifically, sites with a higher number of referring domains consistently outperform weaker link profiles (and often by several multiples).

• Websites with up to 2,500 referring domains receive an average of 1.6-1.8 citations.
• Those with over 350,000 referring domains receive 8.4 citations on average.

The biggest growth spike occurs when crossing the 32,000-link mark, where citations nearly double from 2.9 to 5.6. This clearly demonstrates that link authority compounds. Once a site reaches a critical number of backlinks, its perceived trustworthiness rises exponentially.

At the same time, our research shows that linking out from your website to other high-authority sites appears to have minimal effect compared to incoming backlinks.

This follows the same basic rule we’ve always seen in SEO: backlinks build trust. And ChatGPT seems to look at a variety of backlinks as signs that people find a source reliable.

All of this ties directly into Domain Trust and Page Trust. The more high-quality backlinks your site has, the more “trust” it builds. Strengthening these trust signals is a key step toward getting more AI citations.

Grow your overall visibility in Google

Beyond traditional authority factors, a site’s overall visibility on Google (measured by traffic and average ranking) also significantly affects its chances of being cited by ChatGPT.

To begin with, domain traffic ranks as the second most important factor for ChatGPT citation, but it remains less influential than backlinks.

• Sites under 190,000 monthly visitors average 2-2.9 citations.
• Only after passing 190,000 visitors does a notable correlation appear.
• Domains with 10M+ visitors average 8.5 citations.

This pattern suggests that LLMs like ChatGPT seem to care less about popularity until it becomes undeniable.

Low- to medium-traffic websites don’t gain much advantage in ChatGPT citations. For example, a site receiving 20 organic visitors and another receiving 20,000 visitors tend to receive roughly the same “score” from ChatGPT.

But, it’s not just about attracting traffic to random pages of your website. Our analysis shows that it’s the global traffic to the main page that matters. And websites with at least 7,900 organic visitors to their main page have the highest chances of being cited by ChatGPT.

Produce comprehensive, in-depth content

Length and depth also directly correlate with higher ChatGPT citations.

• Short articles (under 800 words) average 3.2 citations,
• While long-form pieces (over 2,900 words) earn 5.1 citations.

Still, the key isn’t length for its own sake, but it’s depth. ChatGPT favors pages that capture a topic’s full context, nuances, and subtopics.

To apply this:

• Aim for at least 1,900 words for most topics. Where necessary, increase the word count to at least 2,900 words.
• Cover related concepts, synonyms, and examples to enhance semantic variety.
• Include supporting data, such as experts’ quotes and statistics.

In fact, our analysis shows that pages with expert quotes average 4.1 citations versus 2.4 without.

However, the impact of these factors is relatively minor compared to others, and they should be viewed as supporting indicators of high-quality content.

Structure content for topical clarity

Even the best content can underperform if it’s structurally opaque. ChatGPT performs better with content that’s clearly segmented and logically layered.

Pages with an average section length of 120–180 words perform best, with 4.6 citations on average. Extremely short sections (under 50 words) usually result in 2.7 citations.

Embed FAQ sections and question-styled headings within your content

Many in the industry believe that including FAQ-like sections in your content helps ChatGPT find direct answers and increases your chances of being featured in AI responses.

To test this, we analyzed the text for patterns that indicate these sections. Examples include headings such as “FAQ,” “Frequently Asked Questions,” and “Common Questions.”

And at first glance, pages with FAQs and question-based titles seem to perform worse.

Keep content fresh and regularly updated

Content freshness isn’t about being new. It’s about staying relevant.

• Very new content (up to 2 months old) averages 3.6 citations,
• While content aged 1.5–5 years performs similarly at 3.1 citations.

But content updated within the past three months averages nearly double the citations (6.0 vs. 3.6).

Don’t over-optimize your URLs and titles

The effect was so tiny that it confirms what many already suspect: overoptimizing your content with keywords doesn’t help AI models understand it any better.

Optimize Core Web Vitals: INP, FCP, LCP, and Speed Index

Loading speed does matter, but it comes with some nuances. Metrics like First Contentful Paint (FCP) and Largest Contentful Paint (LCP) show an inverse correlation with citations.

Build brand visibility on Quora and Reddit

Today, mentions on discussion platforms act as digital word-of-mouth.

• Minimal Quora presence (up to 33 mentions) → 1.7 citations.
• Heavy Quora presence (6.6M mentions) → 7.0 citations.

Establish a presence on review platforms

Domains featured on multiple review platforms earn 4.6–6.3 citations, versus 1.8 for those absent from such platforms.

Don’t rely solely on LLMs.txt or FAQ schema markup

Our analysis shows that structured data is a nice-to-have, not a game-changer.

Focus on content organization first; schema markup is icing on the cake.

Research methodology

This research examines the factors that influence how LLMs, specifically ChatGPT, cite websites as sources when generating responses. We collected data on a wide range of factors for each domain, including:

• Domain authority and trust: number of referring domains, Domain Trust, Page Trust
• Brand visibility and social presence: brand mentions on Reddit and Quora, global and U.S. brand search volume
• Content quality and semantic relevance: semantic relevance, fraggles, content type, content length, sentence and paragraph length
• Technical performance: Core Web Vitals, indexability checks, structured data
• SEO visibility and traffic metrics: domain and URL traffic, main page traffic, SERP positions

To analyze the relationships between these factors and citation likelihood, we employed an XGBoost regression model. Our report focuses on the top 20 most impactful factors, ranked by their importance in the model.

Conclusion

Our study shows that flashy “AI hacks” like LLMs.txt barely have any impact. What really drives ChatGPT citations are the fundamentals: strong backlinks, high domain and page trust, solid web traffic, and content that’s deep, clear, and easy to read. Fast, responsive pages also help, and being active on Quora and Reddit gives your visibility a noticeable lift. Apart from that, updating your content regularly keeps ChatGPT coming back for more.