Key takeaways
- The AI market is fragmenting: ChatGPT's share fell from 87.2% toward 68–78% while Gemini nearly quadrupled in 12 months.
- Zero-click is becoming the default, 93% of Google AI Mode searches end without a click, so businesses not cited in the AI answer are invisible even when ranked number one.
- UK AI adoption is accelerating, with 39% of UK businesses already using AI and 70% either using or considering it.
- Optimising for ChatGPT alone is no longer sufficient; a complete AEO strategy must cover all five major AI platforms.
- YMYL sectors such as legal, finance and healthcare face the fastest AI search adoption and the strictest E-E-A-T requirements.
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Trend 1: The AI Market Is Fragmenting
2023 and 2024 were dominated by ChatGPT. 2025 saw genuine fragmentation. ChatGPT's market share dropped from 87.2% to as low as 68%, while Gemini nearly quadrupled and Perplexity, Claude and DeepSeek carved out specialist niches.
| Platform | Dec 2024 Share | Dec 2025 Share | Change | Primary Strength |
|---|---|---|---|---|
| ChatGPT | 87.2% | 68–78% | ↓ Declining | General purpose, consumer |
| Gemini | 5.4% | 18.2% | ↑ +3.4× growth | Google integration, mobile |
| Perplexity | 4.1% | 6.6% | ↑ Growing | Research, citations |
| Copilot | 2.1% | 14% | ↑ +6× enterprise | Microsoft 365 integration |
| Claude | 0.8% | 3.2% | ↑ +4× growth | Enterprise, long documents |
For UK businesses, this means: optimising for ChatGPT alone is no longer sufficient. A complete AEO strategy must cover all five major platforms.
Trend 2: Zero-Click Is Becoming the Default
One of the most consequential trends of 2025 is the rise of zero-click search, queries where the user gets their answer within the AI or search interface without clicking through to any website.
The implication is profound: if your business is not cited in the AI answer itself, you are invisible, even if you rank number one in Google's traditional results.
Trend 3: UK AI Adoption Is Accelerating
UK businesses are moving fast. Research published in 2025 shows 39% of UK businesses already use AI in some capacity, with 70% either using or actively considering it.
Trend 4: Voice Search Returns, Powered by AI
Voice search had a false start in the 2010s, but AI has given it new legs. Siri, Alexa and Google Assistant now use LLM technology to answer conversational queries, and they pull from the same AEO signals that drive ChatGPT citations.
| Voice Platform | Monthly Active Users | AI Model | Cites Businesses? |
|---|---|---|---|
| Google Assistant | 500M+ devices | Gemini | Yes |
| Siri | 375M+ iOS users | Apple Intelligence | Yes (local) |
| Alexa | 200M+ devices | Claude-powered | Yes |
| Copilot Voice | Enterprise | GPT-4o | Yes |
Trend 5: AI Content Now Dominates Search Results
Google search results contained 19% AI-generated content as of January 2025. For UK businesses creating content, the implication is that quality, authoritative, human-expertise-led content now stands out, and AI crawlers specifically reward E-E-A-T signals (Experience, Expertise, Authoritativeness, Trust).
Trend 6: YMYL Sectors Are Highest Priority
"Your Money or Your Life" sectors, where AI decisions have real-world financial or health consequences, are seeing the fastest AI search adoption and the strictest E-E-A-T requirements:
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