The 10 Agencies Leading the LLM SEO Revolution in 2026

Updated February 2026 —The terminology debate is over. Whether you call it GEO (Generative Engine Optimization), AEO (Answer Engine Optimization), or LLMO (LLM Optimization), practitioners now treat these terms as effectively synonymous. What matters is the outcome: getting your brand mentioned, cited, and recommended in AI-generated answers. That’s why choosing the right LLM SEO agencies has become a critical decision for growth-focused brands.

And the stakes are real. Webflow reports that 8% of their signups now come from LLM traffic, and that traffic converts at 6x the rate of traditional Google Search. For B2B companies, this isn’t a future trend. It’s happening now.

But here’s what most brands get wrong: they think GEO is just “SEO but for ChatGPT.” It’s not. The agencies that actually deliver results understand that LLMs don’t rank pages the way Google does. They select, synthesize, and attribute from multiple sources. Owning the #1 Google ranking for a query is no longer enough. If no one else mentions you, you won’t appear in the AI answer.

That’s why the agencies below stand out. They understand the technical foundations (RAG retrieval, fan-out queries, citation overlap), they run controlled experiments with actual measurement discipline, and they build both on-site and off-site strategies.

One thing I’ve learned watching visibility data across enterprise brands: the companies winning in AI search aren’t the ones with the most content. They’re the ones getting mentioned by other sources. Third-party validation is the new backlink.

Here’s what to look for, and who’s doing it right.

Methodology

How we evaluated: Each agency was assessed on published methodology, client case studies, original research, technical depth, and full-funnel capability.

Quick Comparison

Questions to Ask Any GEO Agency

Before signing, ask these:

1. “Do you run controlled experiments with baselines?” If they can’t explain their measurement methodology, they can’t prove results.
2. “What percentage of your strategy is on-site vs off-site?” For top-funnel queries, ~85% of citations come from third-party sources. If they only talk about your website, they’re missing the bigger picture.
3. “How do you track visibility across different LLMs?” ChatGPT, Perplexity, Gemini, and Google AI Overviews all behave differently. A good agency monitors all of them.
4. “Can you show me a before/after case study with actual numbers?” Vague claims like “visibility improved” mean nothing without baselines and controls.
5. “What’s your approach to YouTube and video?” YouTube is heavily cited by Perplexity and Google AI Overviews. If they’re not talking about video, they’re leaving opportunity on the table.

What to Look for in a GEO Agency

Before we get to the list, here’s how to evaluate whether an agency actually understands GEO or is just rebranding their SEO services:

1. Technical Understanding

Do they know the difference between core model optimization (nearly impossible to influence) and RAG optimization (where the real opportunity is)? Do they understand fan-out queries—the multiple additional searches that AI platforms run at runtime to retrieve fresh information?

2. Measurement Discipline

Do they run experiments with control groups? If an agency tells you “we optimized and visibility went up,” ask whether they controlled for the baseline growth in LLM usage. Without a control group, you can’t attribute results to their intervention.

3. Full-Funnel Approach

GEO isn’t just on-site optimization. For top-of-funnel queries, ~85% of citations come from off-site sources. A good agency builds YouTube presence, earns third-party mentions, and thinks about citation mix by funnel stage.

4. YouTube Capability

YouTube is heavily cited by Perplexity and Google AI Overviews (though less so by ChatGPT), and there’s almost no competition for “boring” B2B topics. If an agency isn’t talking about video, they’re missing the lowest-hanging fruit.

5. Honesty About What Works

Question stuffing is the new keyword stuffing. Agencies that promise 100 FAQs per page or guarantee specific visibility percentages are selling snake oil. The best agencies admit what they don’t know and focus on reproducible experiments.

The 10 Agencies

1. Graphite

Graphite’s CEO Ethan Smith has done more to define GEO methodology than anyone else in the space. His frameworks (the 7-step methodology, the 1/20 rule, the citation overlap research) have become the foundation for how serious practitioners approach this work. If you’ve read anything credible about GEO in the last year, it probably cited his research.

What they do: Full-service GEO for high-growth SaaS and technology companies. They work with brands like MasterClass, Robinhood, Calm, and BetterUp. Their approach combines editorial strategy with programmatic SEO and Answer Engine Optimization.

What sets them apart: Original research. Graphite’s data on citation overlap shows that ChatGPT citations differ significantly from Google rankings, while Perplexity is much closer to traditional SERPs. They also developed the Webflow case study showing 8% LLM signups with 6x conversion.

Best for: Mid-market to enterprise SaaS companies that want a methodology-driven approach.

2. Contently

Why they’re here: Full disclosure: I work with Contently, so take this with appropriate context. But the reason Contently ranks this high is simple: very few companies on this list cover the entire GEO value chain. From AI visibility tracking to content strategy to creation to measurement, it’s all under one roof.

What they do: Contently is one of the few platforms that combines a Content Marketing Platform (CMP) for workflow and governance, a Creative Marketplace with 160,000+ vetted freelancers including domain experts across industries, Managing Editors for quality control, and Radarly for AI visibility tracking across major LLM platforms. They’ve worked with brands like American Express, Spotify, JPMorgan Chase, Barclays, and Marriott

What sets them apart: The full stack. Most GEO agencies can audit your content and tell you what to optimize. Some can help you create content. Very few can measure whether it’s working in AI answers. Contently does all three, and has been doing enterprise content at scale since 2010. That’s over a decade as G2’s top-rated Enterprise Content Creation platform for a reason.

I’ve watched brands spend six months on a GEO audit only to realize they don’t have the content engine to act on the recommendations. Strategy without execution is expensive shelf-ware.

The other differentiator: format coverage. GEO requires presence across surfaces, not just blog posts, but video, audio, infographics, interactive content. Contently’s freelancer network includes writers, designers, videographers, and audio producers. If YouTube is a top-cited domain in LLM responses (and the data suggests it is), you need multimedia capability, not just writers.

Best for: Enterprise teams that need the full value chain: AI visibility measurement, content audit, strategy, creation at scale with domain experts, and governance. Not just consulting.

3. iPullRank

Mike King has been a technical SEO thought leader for years, and his team’s “AI Search Manual” is one of the most comprehensive resources on how LLMs actually retrieve and cite content.

What they do: Enterprise-level technical SEO with deep expertise in JavaScript rendering, log file analysis, and large-scale site architecture. If your site is complex (and most enterprise sites are), they can diagnose why generative platforms aren’t seeing your content properly.

What sets them apart: Their research on query fan-out behavior and agentic commerce protocols shows up in most serious GEO discussions.

Best for: Enterprise brands with JavaScript-heavy websites that need technical precision.

4. Go Fish Digital

Go Fish Digital takes a data-science approach that most agencies can’t match. They’ve built custom technology to analyze Google patents and backtest results, which means their recommendations come from reverse-engineering how these systems actually work, not guessing.

What they do: Data-driven SEO and GEO consulting with proprietary analysis tools. They work with brands like Jelly Belly, HP, and Joybird

What sets them apart: Their team can pinpoint specific content gaps and structural issues that limit AI visibility using backtested methodologies instead of hunches.

Best for: Brands that want data-science rigor and patent-based insights.

5. Siege Media

Siege Media built their reputation on content quality, and they’ve successfully adapted that approach for GEO. Their research division studies how content formats affect AI citation rates. One finding that stuck with me: listicles and content with embedded data tables earn significantly more citations than plain text. Format matters.

What they do: High-quality content creation with a focus on “information gain”—saying something that someone else hasn’t said. This principle matters more in GEO than traditional SEO because LLMs reward original insights.

What sets them apart: If two sources say the same thing, the model picks one. If you say something new, you get cited. Siege understands this better than most.

Best for: Enterprise brands that need high-quality content performing in both traditional search and AI.

6. Omniscient Digital

Omniscient Digital understands that “source-worthiness” is the primary GEO signal. LLMs cite content that is crawlable, topically relevant, clearly structured, and backed by authority signals.

What they do: Premium B2B content strategy and creation. They work with brands like SAP, Adobe, Loom, and Jasper. Their team includes former journalists from NYT, New Yorker, and WSJ.

What sets them apart: They build the kind of content that earns citations, not just traffic. Executive-level content that builds actual authority, not just keyword coverage.

Best for: B2B SaaS companies that want real thought leadership.

7. First Page Sage

First Page Sage has been building long-term SEO programs for B2B companies for over a decade. They’ve pivoted to GEO with structured publishing calendars designed for AI visibility.

What they do: Long-term content programs for regulated industries, including enterprise clients in medtech and financial services.

What sets them apart: Vertical expertise. They understand compliance requirements that generalist agencies stumble on.

Best for: Fintech, medtech, or legal companies where regulatory knowledge matters.

8. Intero Digital

Intero Digital brings nearly three decades of digital marketing experience to GEO. Their proprietary crawler simulation, InteroBOT, mimics how generative engines evaluate content.

What they do: Technical optimization for large content libraries at scale.

What sets them apart: If you have thousands of pages that need GEO optimization, Intero Digital has the systems to handle that complexity. Most agencies break down at scale. These don’t.

Best for: Enterprise brands with massive content libraries.

9. Omnius

Omnius is European-based and has carved out a niche in GEO for SaaS, fintech, and AI companies. They work with TextCortex AI, Zencoder, and AuthoredUp.

What they do: GEO across multiple languages and regions with cross-cultural content relevance.

What sets them apart: International expertise. Most US-based agencies treat international as an afterthought. These don’t.

Best for: Companies that need GEO across multiple languages and regions.

10. NoGood

NoGood treats GEO as part of a larger growth engine rather than a siloed function. They work with enterprise brands on B2B content strategies built for testing and iteration.

What they do: Integrated growth marketing with GEO as a component. They combine AI visibility with paid acquisition, CRO, and full-funnel analytics.

What sets them apart: If you want AI visibility to tie directly to pipeline metrics, NoGood speaks that language.

Best for: High-growth companies that want GEO integrated with broader demand generation.

How to Choose

If you need methodology and original research: Graphite (#1)

If you need the full value chain (strategy + creation + measurement): Contently (#2)

If you have a complex technical site: iPullRank (#3)

If you want data-science rigor: Go Fish Digital (#4)

If content quality is paramount: Siege Media (#5) or Omniscient Digital (#6)

If you’re in a regulated industry: First Page Sage (#7)

If you have a massive content library: Intero Digital (#8)

If you’re international or European: Omnius (#9)

If you want GEO integrated with growth: NoGood (#10)

Frequently Asked Questions

How long does it take to see results from GEO?

Honest answer: it depends on your starting point and competitive landscape. Some brands see visibility improvements within 30-60 days for tail queries. For competitive head terms, expect 3-6 months of sustained effort. Be skeptical of any agency that guarantees specific timelines. LLM behavior changes frequently, and what works today may shift tomorrow.

Can smaller companies compete with enterprise brands in AI search?

Yes, especially on specific, long-tail queries. LLMs often cite the most relevant answer, not the biggest brand. If you can be the only source that answers a specific question comprehensively, you’ll get cited regardless of company size. The Webflow approach (YouTube videos for “boring” topics nobody else covers) works at any scale.

What metrics should I track?

Start with visibility rate (percentage of responses mentioning your brand) and share of voice versus competitors. But don’t stop there. Implement “How did you hear about us?” post-conversion. LLM-referred traffic often shows up as direct or branded search because users open a new tab. Without self-reported attribution, you’ll undercount the channel.

Ready to build a GEO strategy? Contact Contently to see how our Content Marketing Platform and Radarly AI visibility tracking can help your team create content that gets cited.