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AI Search Trends November 2025 8 min read

ChatGPT vs Google: The Battle for UK Customers

AI traffic converts five times better than Google organic. With ChatGPT now the fourth most visited website on earth, the question isn't whether AI search matters — it's whether your business is in the conversation.

The headline number: LLM visitors convert at ChatGPT (15.9%), Perplexity (10.5%), Claude (5%) and Gemini (3%) — compared to Google organic at just 1.76%. AI-referred traffic is not just growing; it is qualitatively different. Source: Seer Interactive, June 2025

The Numbers That Should Stop Every UK Business Owner

Google has dominated search for over 20 years. But in 2025, a new set of numbers tells a different story about where the high-value customers are going.

4th
most visited website globally — ChatGPT, September 2025
Source: Similarweb
527%
year-on-year increase in AI-referred sessions
Source: Search Engine Land, 2025
1.13B
AI referral visits in June 2025 alone
Source: Search Engine Land, 2025

AI Market Share: Who's Winning in 2025

The AI platform landscape in late 2025 is dominated by ChatGPT — but the competitive picture is shifting fast. Gemini has nearly quadrupled market share in 12 months, while ChatGPT has declined from 87% to around 68–78% depending on measurement methodology.

AI Chatbot Market Share — UK & Global (Late 2025)
ChatGPT
77.97%
78%
Perplexity
15.1%
15.1%
Gemini
6.4%
6.4%
DeepSeek
0.37%
0.37%
Claude
0.17%
0.17%
Source: SE Ranking AI Traffic Research, 2025 — global AI referral traffic distribution

The Conversion Rate Gap: Why AI Traffic Is Worth More

Raw traffic numbers tell one story. Conversion rates tell another — and the conversion rate gap between AI-referred visitors and traditional search is extraordinary.

Traffic SourceConversion Ratevs Google OrganicSession Duration
ChatGPT15.9%+9.0× higher9.7 mins avg
Perplexity10.5%+6.0× higher~9 mins avg
Claude5.0%+2.8× higherN/A
Gemini3.0%+1.7× higherN/A
Google Organic1.76%Baseline~3 mins avg
Google Paid2.1%+1.2×~2.5 mins
Sources: Seer Interactive June 2025; Ahrefs 2025; SE Ranking 2025

Why do AI-referred visitors convert so much better? Because they arrive with their decision already partially made. When ChatGPT recommends your business by name, the visitor arrives with a pre-built trust signal. They're not browsing — they're validating.

What's Happening to Google Organic Traffic

While AI platforms grow, Google's own AI features are eating its traditional click-through rates. The data paints a stark picture for businesses that rely solely on Google SEO:

How AI Overviews Are Changing Google CTR
61%
CTR Drop
Organic CTR fell from 1.76% to 0.61% when AI Overviews appear
34.5%
Position #1 Hit
Top Google ranking loses 34.5% CTR when an AI Overview is present
35%
Cited = Win
Being cited in AI Overviews increases organic CTR by 35% compared to not being cited
49%
Still Click
49% of users still click traditional links after reading an AI-generated answer
Sources: Seer Interactive 2025; Ahrefs 2025; Digitaloft 2025

SEO Is Not Dead — But It's Not Enough

The data is clear: SEO still matters and should not be abandoned. But it must now be paired with AEO (Answer Engine Optimisation) to capture AI-referred traffic. The businesses winning in 2026 are doing both — using SEO for Google visibility and AEO for AI citation.

SEO Only Strategy
  • Captures Google organic (1.76% CVR)
  • Losing CTR to AI Overviews
  • Missing 527% growing AI traffic
  • Zero AI citation benefit
SEO + AEO Strategy
  • Captures Google organic
  • Cited in AI Overviews (+35% CTR)
  • AI referral traffic at 15.9% CVR
  • Entity authority built for future AI

Is your business visible to AI?

See exactly how visible you are across ChatGPT, Perplexity, Gemini and Claude — free AI Visibility Score.

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👩‍💻
Shanaz Begum
Founder of AEO-REX — the UK's first Answer Engine Optimisation consultancy. Former physics teacher, Ofsted inspector and IT consultant. Helping UK SMEs be the business AI recommends. Birmingham, UK.