Claude and ChatGPT agree on brand rankings with a median rank correlation of 0.40

Divergent citation shares highlight different source preferences

BrandInsightAI data shows that Claude and ChatGPT rely on distinct top domains. For instance, whatcar.com appears in 1.1% of ChatGPT citations compared to just 0.1% for Claude, representing a gap of -1 percentage points.

Figure 1Share gap: Claude minus ChatGPT

Data table

Series	gap
whatcar.com	-1pp
gob.pe	-0.8pp
which.co.uk	-0.8pp
mercedes-benz.com	-0.8pp
emirates.com	-0.8pp
gov.uk	-0.8pp
kia.com	-0.7pp
hyundai.com	-0.7pp

Top domains shape each model's distinct reading habits

Examining individual domains reveals further contrast. wikipedia.org leads Claude's sources, accounting for 0.6% of its citations. Meanwhile, ChatGPT leans heavily towards automotive and government resources such as whatcar.com at 1.1%.

Figure 2Claude — top sources

Data table

Series	share
wikipedia.org	0.6%
yahoo.com	0.3%
nih.gov	0.3%
aol.com	0.3%
forbes.com	0.2%
arxiv.org	0.2%
statista.com	0.2%
usnews.com	0.2%
mordorintelligence.com	0.2%
ensun.io	0.2%

Moderate rank correlation demonstrates shared underlying patterns

Despite differing top domains, Claude and ChatGPT agree on brand rankings with a median rank correlation of 0.40, where 1 represents identical order and 0 indicates an unrelated relationship.

Figure 3Brand-ranking agreement by model pair

Data table

Series	median rho
Google AIO × Google AI Mode	0.5
DeepSeek × Meta AI	0.5
Gemini × Google AI Mode	0.5
Perplexity × ChatGPT	0.5
Gemini × Google AIO	0.5
Claude × Meta AI	0.5
Gemini × DeepSeek	0.5
Claude × Gemini	0.5
ChatGPT × Google AIO	0.4
ChatGPT × Meta AI	0.4
Perplexity × Gemini	0.4
Perplexity × Google AIO	0.4
DeepSeek × Google AIO	0.4
Gemini × Meta AI	0.4
Grok × Google AIO	0.4
Gemini × ChatGPT	0.4
ChatGPT × DeepSeek	0.4
ChatGPT × Google AI Mode	0.4
Perplexity × DeepSeek	0.4
Claude × Perplexity	0.4
Claude × ChatGPT	0.4
Claude × Google AIO	0.4
Claude × Google AI Mode	0.4
Perplexity × Google AI Mode	0.4
Perplexity × Meta AI	0.4
DeepSeek × Google AI Mode	0.4
Google AI Mode × Meta AI	0.4
Gemini × Grok	0.4
ChatGPT × Grok	0.4
Grok × Google AI Mode	0.4
Perplexity × Grok	0.4
Grok × DeepSeek	0.4
Google AIO × Meta AI	0.3
Claude × Grok	0.3
Claude × DeepSeek	0.3

Figure 4ChatGPT — top sources

Data table

Series	share
whatcar.com	1.1%
gob.pe	0.9%
which.co.uk	0.9%
mercedes-benz.com	0.9%
gov.uk	0.8%
kia.com	0.8%
fda.gov	0.8%
hyundai.com	0.8%
gov.sa	0.7%
tesla.com	0.7%

Figure 5Source mix: the tale of the tape

Data table

Series	social platforms	news publishers	comparison & review sites	academic & research	marketplaces	B2B research	everything else
Claude	1%	1.3%	1%	0.8%	1%	0.9%	94%
ChatGPT	0.9%	2.3%	3.2%	0.4%	1.1%	1.6%	90.5%

Method & limitations

• Metrics reflect correlation rather than causation.
• Analysis is restricted to the specific domains and models captured in the July 2026 dataset.

How every figure on this page is counted, floored and reviewed: our methodology.

More from Model vs Model

• Grok vs Google AI Mode: Where They Get Their Answers — May 2026
• Google AIO vs Google AI Mode: Where They Get Their Answers — June 2026
• Claude vs Perplexity: Where They Get Their Answers — July 2026

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