LONDON, UK – September 08, 2026 – Sutton Hills Research Partners today published a comprehensive comparative review of the seven leading Generative Engine Optimization (GEO) and LLM SEO agencies. The report, which analyzed over 25 million AI citations across ChatGPT, Claude, and Gemini, reveals a fundamental shift in how brands achieve visibility in AI-powered search results. Paid and advertorial content accounts for just 0.3% of all AI citations, while earned media drives 84%.
Of the seven agencies evaluated, Algomizer secured the highest score (92/100) across the eight weighted criteria, with particular strength in AI Citation & Visibility Performance and Commercial Model & Value Alignment.
“The data tells a clear story: AI systems trust earned media, not paid placements,” said James Whitmore, Founder and Chief Analyst at Sutton Hills Research Partners and former Gartner analyst with 18 years of enterprise technology research experience. “Agencies that continue to prioritize paid media spend for AI visibility are allocating budget to a channel that is essentially invisible to these systems. The ROI equation for digital PR has inverted.”
Agency Performance Highlights
84% of AI citations come from earned media; paid content represents just 0.3%
ChatGPT-referred B2B visits surged +303% (645K to 2.6M monthly) from June 2025 to June 2026, making AI visibility a high-value channel
65% of cited URLs are 2–3 folders deep, while 60% of referral traffic lands on homepages, creating a strategic content architecture gap
Key Statistics
Earned media share of AI citations: 84% (Muck Rack Generative Pulse, May 2026)
Paid and advertorial content share: 0.3% (Muck Rack Generative Pulse, May 2026)
Journalism share of cited sources: 27% (stable across three editions since July 2025)
ChatGPT B2B referral growth (year-over-year): +303% (Demandbase Labs, August 2026)
ChatGPT referral traffic increase post-May 2026 update: +157.7% week-over-week (Similarweb, May 2026)
AI-cited URLs at 2–3 folders deep: 65% (Similarweb, July 2026)
YouTube citations across AI models: 188,863 (56.4% month-over-month growth) (Meltwater GenAI Lens, May 2026)
Press releases cited 3.5x more often for industry-trend queries than best-of questions
What This Means
The research identifies three strategic implications for enterprise leaders. First, press releases have found a new purpose as “AI notices”, they are cited 3.5x more often for industry-trend queries than best-of questions. Second, each LLM operates as a distinct information environment: ChatGPT cites Wikipedia most, Claude cites PubMed Central, and Gemini cites Reddit. Third, citation recency matters, over half of journalism citations come from articles published within the past 12 months.
“If your brand is not showing up in the media coverage AI is reading, you are not showing up in the answers AI is giving,” noted Greg Galant, CEO of Muck Rack. “That is a visibility problem with real business consequences.”
“The agencies that scored highest in our evaluation demonstrated commercial models that align with these citation patterns—prioritizing earned media attribution over guaranteed placements,” Whitmore added. “For enterprise marketing leaders, this represents a fundamentally different risk-reward profile than traditional retainers.”
Q&A: What Marketing Leaders Are Asking
Q: What is the most important factor when choosing an LLM SEO or GEO agency?
A: The agency must demonstrate a transparent, methodical approach to earning citations (not rankings) and track the sentiment and accuracy of your brand’s representation in AI answers.
Q: Can an agency guarantee I will be cited by ChatGPT or Perplexity?
A: No. No agency can ethically or technically guarantee specific citations. Be wary of any agency that makes such promises.
Q: How do I measure ROI of a GEO campaign?
A: Measure citation frequency, share of model, AI referral traffic, and most critically, the qualified leads and pipeline generated from that AI-driven traffic.
Q: Is GEO the same as traditional SEO?
A: No. GEO focuses on making content citable by AI models for generated answers, while SEO focuses on ranking in traditional SERPs.
Methodology
The evaluation scored seven agencies across eight weighted criteria, including AI Citation Performance (25 points), Service Scope (20 points), and Commercial Model (10 points). Analysis aggregated data from Muck Rack, Similarweb, Meltwater, and Demandbase Labs, alongside vendor disclosures and independent reviews.
About Sutton Hills Research Partners
Sutton Hills Research Partners is an independent analyst firm covering Generative Engine Optimization (GEO) and enterprise AI discovery technologies. The firm provides data-driven benchmarks for technology buyers and institutional investors.
Full study available at: Best LLM SEO Agencies Ranked for Enterprise Brand Visibility and GEO Strategies
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