Why AI results differ
between platforms
Ask ChatGPT for the best accountant in Manchester and you get one answer. Ask Gemini the same question and you get a completely different one. Ask Perplexity and you get a third. This is not a flaw. Each platform uses different data sources, different search engines and different models. Understanding these differences is crucial for managing your AI visibility.
11%
source overlap between AI platforms
4+
major AI platforms give business recommendations
47%
of UK adults use ChatGPT for search
22%
use Gemini for search in the UK
Three reasons AI platforms give different answers
Different data sources
ChatGPT searches via Bing. Gemini uses Google's full ecosystem. Perplexity has its own search index. Claude uses its own web search. Each platform accesses different parts of the internet, which means they find different information about your business.
Research shows only 11% overlap in sources between platforms answering the same question. That means 89% of the information each platform uses is unique to that platform. A business visible on Bing-indexed sites may be prominent on ChatGPT but invisible on Gemini.
Different AI models
Each platform runs a different language model with different training data and different reasoning patterns. GPT-4o processes information differently from Gemini Pro, which processes differently from Claude. Even when given the same sources, they may weigh evidence differently and reach different conclusions.
One model might prioritise review volume. Another might prioritise content depth. A third might emphasise how recently information was published. These differences in weighting lead to different businesses being recommended.
Inherent variability
AI answers are probabilistic, not deterministic. Ask the same question to the same platform twice and you may get different answers. The model generates each response fresh, drawing from slightly different parts of its knowledge and search results.
This means even on a single platform, your visibility fluctuates. You might be mentioned in 7 out of 10 queries one week and 5 out of 10 the next. Tracking your visibility rate over time gives a much more accurate picture than any single test.
How each platform differs in practice
ChatGPT
Search engine: Bing
Strengths: General knowledge, broad web coverage, conversational follow-ups
What it values: Consensus across multiple sources. If several websites agree your business is good, it recommends you.
Best for: Businesses with broad online presence across multiple platforms
Google Gemini
Search engine: Google (full ecosystem)
Strengths: Local businesses, Google Business Profile integration, Maps data
What it values: Google ecosystem presence. Business Profile, Maps listing, Google Reviews carry heavy weight.
Best for: Local businesses with strong Google presence
Claude
Search engine: Own web search
Strengths: Nuanced analysis, content quality assessment, accuracy
What it values: In-depth, well-written content. Rewards genuine expertise over marketing copy.
Best for: Professional services and businesses with strong content
Google AI Overviews
Search engine: Google Search results
Strengths: Integrated into regular Google, uses live search rankings
What it values: Traditional SEO signals plus structured data. Most similar to regular Google rankings.
Best for: Businesses already ranking well on Google
What this means for your visibility strategy
Because platforms differ, you cannot optimise for just one. A business visible on ChatGPT may be invisible on Gemini. A business recommended by Claude may not appear on Perplexity. You need a strategy that works across all platforms.
The good news: the fundamentals are the same everywhere. Strong reviews, consistent information, quality content and multi-platform presence work for all AI platforms. The differences are in emphasis, not in kind.
Here is a practical approach for UK businesses:
- For Gemini: Complete your Google Business Profile, collect Google Reviews, maintain Google Maps listing
- For ChatGPT: Be present on multiple platforms, build Trustpilot profile, ensure Bing indexes your content
- For Claude: Write detailed, expert content on your website. Depth and quality matter most.
- For AI Overviews: Focus on traditional SEO and structured data. If you rank on Google, you have a head start.
The most important implication: you need to monitor your visibility across all platforms, not just one. Being recommended by ChatGPT but invisible on Gemini means you are missing the 22% of UK AI searchers who use Gemini. Being visible on Gemini but not ChatGPT means you are missing the 47% who use ChatGPT.
Comprehensive monitoring also reveals patterns. Maybe your Google Business Profile is strong (good Gemini visibility) but your website content is thin (poor Claude visibility). That diagnosis tells you exactly where to invest your effort next.
Do not test on just one platform. Check ChatGPT, Gemini and Perplexity at minimum. The differences tell you where your visibility gaps are and how to fix them.
Learn more about how to build visibility across all platforms in our guide on how to get visible in ChatGPT and what are AI search engines.
How does your business perform across all platforms?
VestVale monitors ChatGPT, Gemini, Claude and Google AI in one dashboard. See where you are strong and where you are missing.
A real-world example: the same question on four platforms
Consider the question: "Who is a good estate agent in Leeds?" Here is what typically happens when you ask each platform:
ChatGPT searches Bing and its training data. It might recommend an estate agent with a strong Rightmove presence, good Trustpilot reviews and detailed content on their website. It values consensus across multiple platforms.
Gemini leans on Google data. It is more likely to recommend the agent with the best Google Business Profile: most Google reviews, complete Maps listing, responsive to reviews. An agent with 200 Google reviews and a 4.7 rating has a strong advantage here, even if their website content is thin.
Claude values content quality. It might recommend an agent that publishes detailed local area guides, market analysis and helpful buying advice. The one whose website reads like an expert resource rather than a sales brochure.
Google AI Overviews pulls from Google search rankings. The estate agent ranking highest for "estate agent Leeds" in regular Google is most likely to appear here. Traditional SEO matters most.
The result? Four different platforms might recommend four different estate agents for the same question. Or some overlap, but with different framing. The agent who appears across all four is the one with strong presence on every dimension: reviews, content, Google profile and SEO.
Now add the variability factor. Ask each platform the same question tomorrow and the answers may shift again. ChatGPT might surface a different agent because it drew from slightly different search results. This is why single-test visibility checks are misleading. You need continuous monitoring to understand your true visibility rate across all platforms.
The lesson is clear: businesses that only optimise for one platform miss customers on all the others. A comprehensive approach that covers reviews (Gemini), content (Claude), multi-platform presence (ChatGPT) and SEO (AI Overviews) gives you the widest possible visibility. Read more about the full strategy in our guide on how AI recommends businesses.
Frequently asked questions
Why does ChatGPT recommend my competitor but Gemini does not?
Your competitor likely has strong presence on platforms indexed by Bing (which ChatGPT uses) but a weaker Google Business Profile (which Gemini relies on). Each platform's data sources determine who appears. Monitor both to understand your full visibility picture.
Will AI platforms become more similar over time?
They may converge somewhat, but fundamental differences in data sources (Bing vs Google vs independent) will likely persist. Each platform has incentives to differentiate. The safe strategy is to build a strong presence that works regardless of which search engine powers the AI.
Which platform should I prioritise?
In the UK, ChatGPT has the largest user base (47% of AI searchers). Gemini is second (22%) and is critical for local businesses. The best approach is to optimise for all platforms, since the core actions (reviews, content, consistency) benefit all of them.
Why does the same platform give me different answers each time?
AI models are probabilistic. Each response is generated fresh, drawing from slightly different parts of the available data. Your visibility rate (how often you appear over many queries) is more meaningful than any single answer. This is why ongoing monitoring matters.
Can I optimise for one platform and ignore the others?
You could, but you would miss a significant portion of potential customers. ChatGPT has 47% of UK AI searchers, Gemini has 22%, and Copilot has 21%. Ignoring any major platform means ignoring millions of UK users. The core actions (reviews, content, consistency) benefit all platforms equally, so the additional effort to cover all of them is minimal compared to the benefit.
Does Bing SEO matter now because ChatGPT uses it?
Yes. Since ChatGPT uses Bing for live web searches, your Bing rankings directly influence your ChatGPT visibility. Most Google SEO practices also apply to Bing, but you should make sure your site is indexed on Bing Webmaster Tools. Many UK businesses overlook Bing entirely, which is a missed opportunity now that it powers the world's most popular AI platform.
Monitor your visibility across all AI platforms
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