Generative Engine Optimisation (GEO) is the fastest-growing discipline in digital marketing. With search volume for “geo agency” growing over 1,300% year-on-year and AI-powered search tools now handling millions of queries daily, businesses are scrambling to find agencies that can deliver genuine AI visibility. The problem? GEO is so new that many agencies offering it have no real track record — they’ve simply rebranded their existing SEO services with AI-sounding language.
This guide gives you a practical framework for evaluating GEO agencies. It’s based on what actually matters for getting your brand cited by ChatGPT, Perplexity, Google AI Overviews and other generative search tools — not marketing buzzwords. We’ll cover exactly what to look for, what to avoid, and the technical questions that will immediately reveal whether an agency truly understands generative engine optimisation or is just riding the hype.
What a GEO Agency Actually Does (And What It Doesn’t)
Before evaluating agencies, you need to understand what genuine GEO work involves. A credible GEO agency will work across three interconnected layers:
Entity Authority Building: Ensuring AI models recognise your brand as a distinct, authoritative entity in your industry. This involves structured data, knowledge panel optimisation, consistent NAP and brand mentions across authoritative sources, and building the kind of topical authority that LLMs use when deciding which brands to cite.
Content Architecture for AI Citability: Restructuring your content so that AI models can extract, attribute and cite it effectively. This means clear definitions, data-rich statements, structured Q&A formats, comparison content, and concise expertise summaries that LLMs prefer to quote. It’s not just about writing “good content” — it’s about formatting content in ways that match how retrieval-augmented generation (RAG) systems select sources.
Multi-Platform Monitoring and Optimisation: Tracking your brand’s visibility across ChatGPT, Perplexity, Google AI Overviews, Bing Copilot, Claude and other platforms — then adjusting strategy based on where citations are appearing or missing. Each platform has different retrieval methods, different source preferences and different update cycles.
What GEO is NOT: simply writing longer blog posts, stuffing pages with AI-related keywords, or running your existing content through an AI rewriting tool. If an agency’s “GEO service” looks suspiciously like their regular SEO service with a new name, that’s a red flag.
Why the Right GEO Agency Matters More Than the Right SEO Agency
With traditional SEO, a mediocre agency might still get you some results through sheer volume of content and basic technical fixes. With GEO, there’s no such margin for error. AI models are binary in their citation decisions — you’re either the source they reference or you’re not. There’s no equivalent of ranking on page two. You’re cited or invisible.
This makes the choice of GEO agency genuinely high-stakes. The right partner can position your brand as the definitive authority in your space across every major AI platform. The wrong one wastes 6-12 months of budget while your competitors establish the AI authority that compounds over time — just like early SEO adopters built insurmountable organic advantages in 2010-2015.
The 8 Criteria That Actually Matter When Evaluating a GEO Agency
Forget the glossy case studies and award badges for a moment. These are the concrete things to evaluate:
1. Proven SEO Foundations — Not Just GEO Promises
GEO builds on SEO; it doesn’t replace it. Any agency without a demonstrable track record in technical SEO, content strategy and authority building will struggle with GEO because the fundamentals overlap. Specifically, look for evidence of schema markup expertise (this is the technical bridge between SEO and GEO), content strategy that drives organic results (not just content production), and technical SEO depth (site architecture, crawl efficiency, Core Web Vitals). If an agency can’t show you concrete SEO results for real clients, their GEO offering is theoretical at best.
2. Multi-Platform AI Understanding
The GEO landscape is fragmented. Each AI platform retrieves, evaluates and cites sources differently. Google AI Overviews primarily pulls from indexed web content and favours pages already ranking well. ChatGPT uses both training data and real-time web retrieval via plugins and browsing. Perplexity is retrieval-heavy, citing sources inline with numbered references. Bing Copilot integrates with Bing’s search index. Claude uses training data with web search capabilities.
A GEO agency worth hiring should be able to explain these differences in specific, technical terms — not just list the platform names. Ask them: “How does Perplexity’s source selection differ from Google AI Overviews?” If they can’t give you a substantive answer, they haven’t done the work.
3. Entity SEO and Structured Data Expertise
This is the single most reliable indicator of genuine GEO capability. AI models rely heavily on entity recognition — understanding that “your brand” is a specific entity with defined attributes, relationships and authority signals. An agency with real GEO expertise will talk about Organisation schema, knowledge panels, sameAs properties, entity consolidation across the web and topical authority mapping. If their GEO pitch doesn’t mention entities and structured data prominently, they’re focused on content volume rather than the technical signals that actually influence AI citations.
4. Transparent Measurement Methodology
GEO measurement is genuinely difficult because AI platforms don’t provide analytics dashboards like Google Search Console. Any agency claiming precise, dashboard-level GEO metrics is likely overpromising. What a credible agency SHOULD offer is: regular AI citation audits (manually querying platforms with your target terms and documenting whether you’re cited), competitive benchmarking (who IS being cited for your terms), brand mention tracking across platforms LLMs scrape, and correlation analysis between content changes and citation changes. The honest truth? GEO measurement is still maturing. An agency that acknowledges this while having a rigorous manual process is more credible than one showing you a fancy automated dashboard.
5. Content Strategy Beyond Blog Posts
Most agencies’ “GEO content strategy” is just writing more blog posts. That’s necessary but wildly insufficient. Genuine GEO content strategy includes: definition-rich cornerstone content that AI models can quote directly, structured comparison and “versus” content that LLMs use for recommendations, data and statistics content (AI models love citable data points), HowTo and process content with clear step structures, FAQ content targeting the exact questions people ask AI assistants, and expert commentary and original research that builds citation authority. The content format matters as much as the content quality because of how RAG systems extract and attribute information.
6. Technical Implementation Capability
Can the agency actually implement what they recommend? GEO isn’t just strategy — it requires hands-on technical work including schema markup implementation (FAQPage, HowTo, Organisation, Article, Speakable), site architecture changes, structured data testing and validation, CMS modifications for AI-friendly content formatting, and often, custom development work for interactive tools and calculators that earn citations naturally.
Agencies that produce strategy documents but rely on your development team for implementation create a translation gap that dilutes results. The best outcomes come from agencies that can diagnose AND fix — strategy and execution under one roof.
7. Industry and Sector Experience
GEO strategy varies significantly by industry because different sectors have different competitive dynamics in AI citations. B2B SaaS companies need to optimise for comparison queries and feature-specific recommendations. Law firms need to build E-E-A-T signals that AI models trust for sensitive legal topics. Healthcare companies face YMYL (Your Money, Your Life) considerations that affect how AI models evaluate source authority. E-commerce brands need product-level entity optimisation. The GEO tactics that work for a SaaS company won’t necessarily work for a law firm. Ask agencies about their experience in YOUR sector specifically.
8. Honest Timelines and Expectations
AI citation building is not instant. Training data updates happen on irregular schedules. RAG-based retrieval depends on content being indexed, structured and authoritative enough to be selected. Any agency promising AI citations within 30 days is either lying or doesn’t understand how LLMs work. Realistic timelines are: 1-2 months for technical foundation and content restructuring, 3-4 months for initial citation appearances in retrieval-based platforms (Perplexity, Google AI Overviews), 6-12 months for consistent citation presence across multiple platforms, and ongoing for training data influence (which depends on LLM retraining cycles). An agency that sets these honest expectations upfront is one that understands the space.
Red Flags: When to Walk Away
In a market this new, there are more agencies bluffing than delivering. Walk away if you encounter any of these:
“We guarantee AI citations” — No one can guarantee this. AI models are independent systems with opaque selection criteria. Anyone guaranteeing citations doesn’t understand the technology.
“Our proprietary AI tool handles everything” — GEO cannot be automated by a tool. It requires human strategic thinking, content creation, entity building and manual monitoring. Tools can assist, but any agency relying primarily on automation is cutting corners.
They can’t explain the difference between AIO, AEO and GEO — These are related but distinct disciplines. AI Optimisation (AIO) is the broadest umbrella. Answer Engine Optimisation (AEO) focuses specifically on appearing in AI-generated answers. Generative Engine Optimisation (GEO) encompasses optimising for all generative AI systems. An agency that uses these interchangeably without distinction hasn’t thought deeply about the space.
Their own brand isn’t being cited by AI — This is the ultimate test. Ask ChatGPT and Perplexity about GEO agencies in their area. If the agency selling you GEO services doesn’t appear in AI recommendations themselves, that tells you everything.
They have no SEO case studies predating their GEO offering — GEO agencies that appeared overnight with no prior SEO track record are almost certainly repackaging basic services under a trendy label.
How Much Should a GEO Agency Cost?
GEO is specialist work requiring senior expertise, so it commands premium rates compared to standard SEO. As a benchmark for the UK market in 2026:
AI Visibility Audit (one-off): £1,500–£5,000 depending on the size of your digital footprint and number of platforms audited. This should include a comprehensive analysis of your current AI citation status, entity authority assessment, competitive benchmarking and a prioritised action plan.
Monthly GEO Retainer: £1,500–£5,000+ per month for combined SEO and GEO strategy with implementation. Lower end for smaller businesses with limited competitive landscapes; higher end for enterprise or highly competitive sectors. Be wary of agencies offering “GEO” for under £500/month — at that price, you’re getting relabelled blog posts, not genuine generative engine optimisation.
Day Rate (specialist consultancy): £600–£900 for senior GEO consultants who combine SEO depth with AI optimisation expertise. This model works well for businesses that have internal marketing teams but need specialist GEO guidance and strategy.
GEO and Traditional SEO: The Integration Imperative
The most important thing to understand about choosing a GEO agency is this: GEO does not replace SEO. It extends it. Google still processes billions of traditional searches daily. Organic rankings still drive the majority of website traffic. But the growing share of discovery happening through AI platforms means you now need both — a strong SEO foundation AND AI-specific optimisation layered on top.
The strongest GEO agencies are those that treat traditional SEO and generative engine optimisation as a unified discipline, not separate services. The technical foundations (structured data, content architecture, authority building) serve both channels. The measurement frameworks track both channels. The content strategy serves both channels. If an agency treats GEO as an isolated add-on rather than an integrated extension of your SEO strategy, you’ll end up with fragmented results and duplicated effort.
Making Your Decision
Choosing a GEO agency is a significant investment in your business’s future visibility. The AI search revolution is not a future concept — it’s happening right now, and the businesses that move first will build compounding advantages that become increasingly difficult to overcome. Use the framework and questions in this guide to evaluate agencies rigorously. Look for genuine technical depth, honest expectations, proven SEO foundations and — above all — evidence that they practice what they preach by being cited by AI models themselves.
The right GEO agency will feel less like a vendor and more like a strategic partner who genuinely understands both where search is today and where it’s heading.