Short answer: SEO Engico is the best LLM SEO agency for most businesses because it works on the sites models trust as well as your own pages, with in-house link building and AI search included in its SEO retainer. Five Blocks suits large companies worried about how AI describes their reputation, The AI SEO Agency suits brands that want Wikipedia, forum and press sources worked on, DoodleWeb is the published-price option, and Loganix fits agencies needing white-label delivery.
An LLM SEO agency works on how large language models understand and describe your brand. That sounds like AEO with a new label, and there is overlap, but the emphasis is different. AEO usually asks whether you get named for a buyer's question. LLM SEO also asks what the model believes about you: your category, your prices, your reputation, whether it still describes the product you had two years ago. Those beliefs come from two places, what the model learned in training and what it retrieves when it searches, and both are shaped mostly by sites you do not own.
So this list favours agencies that work on representation as well as citations, and that do real work on the wider web rather than only on your pages. Every entry was checked against its own website in November 2026, and we describe each one from what it publishes. Prices are quoted where they are printed.
Disclosure: Kuma SEO is written by the team at SEO Engico, the agency ranked first on this list. No agency paid to appear here. We checked every other entry against the agency's own website in November 2026. Services and prices change, so confirm the details with an agency before you sign. More on how we work in our editorial policy.
At a glance: the 7 best LLM SEO agencies
| # | Agency | Best for | Based in |
|---|
| 1 | SEO Engico | Brands that need the sites models trust worked on, not just their own pages | London, UK |
| 2 | Five Blocks | Large companies and executives worried about how AI describes their reputation | New York, US and Jerusalem |
| 3 | The AI SEO Agency | Brands that want Wikipedia, forum and press sources worked on in tiered packages | Cheltenham, UK |
| 4 | Found | Established UK consumer and ecommerce brands adding LLM work to existing SEO | London, UK |
| 5 | DoodleWeb | B2B and professional services firms that want LLM SEO with a published monthly price | Seattle, Washington, US |
| 6 | Embarque | SaaS teams that want LLM SEO built on product-led content and third-party placements | Global team, UK, US, Asia, Africa, Europe |
| 7 | Loganix | Agencies that want LLM SEO delivered white label under their own brand | Vancouver, British Columbia, Canada |
How we picked
- Audits what models say, not only whether they say it. Being mentioned with the wrong price, an old product name or a poor reputation is worse than useful. Look for an audit that checks accuracy and sentiment across models, and lists the specific claims that need correcting.
- Separates learned knowledge from live retrieval. What a model recalls without searching changes only when a newer model ships. What it retrieves changes as the web changes. A good LLM SEO agency knows which of your problems sit where and sets timelines to match.
- Works on the sources models learn from. Reviews, roundups, forums, press, reference sites and partner pages carry much of the weight. Ask which third-party sources shape answers in your category today and how the agency earns or corrects your presence on them.
- Keeps your facts consistent everywhere. Models trust what they see repeated. Your name, category, location, people and prices should match across your site, structured data, profiles and listings, and someone should own keeping them that way.
- Reports by model, over repeated runs. ChatGPT, Claude, Gemini, Perplexity and Google's AI features do not agree with each other, and none of them answers the same way twice. Reporting should show each model separately and use enough runs to tell a real change from noise.
The 7 best LLM SEO agencies in 2026
Our top pick
1. SEO Engico
- Best for
- Brands that need the sites models trust worked on, not just their own pages
- Based in
- London, UK
- Founded
- 2018
SEO Engico is a London agency founded in 2018 that runs SEO, AI search, links and websites in one team. Its LLM work starts by checking whether ChatGPT, Google AI Mode, Perplexity and Claude name you for the questions your buyers ask, and who they name instead. On your own site that means pages with the answer near the top in words a model can lift, markup and profiles so AI tools know who you are and where, and a site open to AI crawlers.
The reason it suits an LLM brief is the off-site half. Mentions on trusted sites, such as reviews, listings and coverage, are part of the AI search work, and its own team finds, checks and places every link. Each site has to pass three checks: real organic traffic verified in Ahrefs, relevance to your niche and a clean outbound link profile. About 70% fail. It uses no PBNs, broker lists or marketplaces, and its delivery records show 94% of placements still live after 12 months. It can also place brands on best-of lists at an agreed position, without promising ChatGPT will quote them.
AI search sits inside the $4,500 a month Growth retainer, with link building included, after a 30-day Revenue Baseline ($3,499) that connects search to calls, forms and closed deals.
What stands out
- Checks who ChatGPT, Google AI Mode, Perplexity and Claude name instead of you, every month
- In-house link building with three checks per site and no broker lists
- Listicle placements with the position agreed in the order and every list approved by you
- Monthly reports open with calls, enquiries and revenue
Worth knowing
- It never promises a specific citation. Page changes can show within weeks, while mentions on other sites take longer.
- Its published case studies report Search Console and Ahrefs figures rather than model-by-model results, so ask to see a sample AI tracking report.
Read SEO Engico's approach to AI search
No. 2
2. Five Blocks
- Best for
- Large companies and executives worried about how AI describes their reputation
- Based in
- New York, US and Jerusalem
- Founded
- 2003
Five Blocks is a digital reputation firm that has worked since 2003 on what people find about companies and their leaders online. Its pitch is that how Google, Wikipedia and AI describe you is your reputation, and it manages all three. That makes it the most representation-focused entry on this list: the question is less whether a model names you and more whether what it says is accurate, current and fair.
Its own platform, AIQ, captures every answer and cited source from ChatGPT, Gemini, Copilot, Perplexity, Grok, Claude, Google AI Mode and AI Overviews each day, and compares you with peers. Services include entity optimisation, Wikipedia strategy carried out within Wikipedia's guidelines, reputation crisis work and digital audits. Its published research on how AI describes the Fortune 100 is a good way to judge its thinking.
What stands out
- Daily capture of answers and sources across eight AI engines
- Wikipedia strategy, which matters because AI answers lean on it
- Works alongside PR, communications and legal teams
Worth knowing
- Its clients are mostly Fortune 500 companies, multinationals and senior executives, so smaller businesses are not the focus.
- This is reputation work rather than lead generation, and no pricing is published.
No. 3
3. The AI SEO Agency
- Best for
- Brands that want Wikipedia, forum and press sources worked on in tiered packages
- Based in
- Cheltenham, UK
The AI SEO Agency has one of the clearest definitions of LLM SEO in this market. It calls it the raw-material layer: strengthening how accurately and favourably models represent your brand across the sources that feed both training and live retrieval, naming Wikipedia and Wikidata, structured databases, forums such as Reddit and Quora, press coverage and documentation. Its point is that a page can be perfectly optimised and still be misdescribed if the threads and reference entries around it say something different.
The service runs across eight disciplines, from an LLM visibility audit and schema to Wikipedia and Wikidata optimisation, community visibility, digital PR and reporting on mention accuracy, source presence and retrieval frequency.
What stands out
- Reports mention accuracy and source presence, not just citations
- Published starting prices: from £1,000, £3,000 and £5,000 a month
- Separates LLM SEO from its AEO, AIO and GEO services so you can see what each covers
Worth knowing
- Wikipedia, community and PR work only start at the £3,000 tier, so the entry plan is mostly on-site.
- It says every campaign is scoped, so the tier prices are starting points rather than fixed fees.
No. 4
4. Found
- Best for
- Established UK consumer and ecommerce brands adding LLM work to existing SEO
- Based in
- London, UK
Found is a London digital marketing agency covering SEO, paid media, digital PR and data. It says it works with big brands and those that aspire to be big, and its LLM SEO service is a set of five practical workstreams rather than a single product. Semantic content structuring reworks entity connections and context so models read authority correctly. Prompt-led keyword expansion researches the conversational questions that trigger answers in your industry, and structured FAQ development turns those into question-and-answer content built for models to reference.
On the technical side it implements and manages llms.txt files to shape how AI platforms access your content, and a community mentions strategy builds brand mentions on the platforms models trust. Its AI search blog publishes regular practical guides, including a 2026 checklist for Google AI Mode.
What stands out
- Community mentions treated as a named workstream
- Prompt research built around conversational queries, not keywords alone
- Paid media, digital PR and data teams in the same agency
Worth knowing
- Pricing is not published.
- It describes LLM optimisation as ongoing monitoring and refinement, so expect a retainer rather than a one-off project.
No. 5
5. DoodleWeb
- Best for
- B2B and professional services firms that want LLM SEO with a published monthly price
- Based in
- Seattle, Washington, US
DoodleWeb is a Seattle agency whose LLM SEO page is unusually specific about price and output. The Core plan costs $1,200 a month for one domain: up to 20 buyer questions tracked daily across ChatGPT, Perplexity, Gemini, Claude, Copilot and Google AI Overviews, one fact-checked answer page drafted each working day, schema, llms.txt and robots.txt kept current, and directory submissions. Custom starts at $2,500 a month on a three-month initial term and adds competitor tracking, LinkedIn posts, a weekly YouTube answer video and a weekly working session with the founders.
Its measurement records citation presence, answer position, cited URL, sentiment and competitor mentions for each prompt, reported per engine rather than blended into one score.
What stands out
- Two plans with published prices and cancellation terms
- Sentiment and cited URL logged for every tracked prompt
- A 90-day guarantee: if AI visibility does not improve, you do not pay
Worth knowing
- Nothing goes live without your approval, but the volume of drafted pages means someone on your side needs to review regularly.
- It says broad commercial prompts commonly take 60 to 90 days or longer to move.
No. 6
6. Embarque
- Best for
- SaaS teams that want LLM SEO built on product-led content and third-party placements
- Based in
- Global team, UK, US, Asia, Africa, Europe
Embarque is a SaaS-focused content and SEO agency whose LLM SEO service rests on a simple idea: make sure AI engines know who you are, understand what you do and feel confident recommending you. In practice that means auditing where you appear by testing prompts across the major AI platforms and checking your site's technical setup, then writing citation-ready content with clear sections and natural language.
The off-site half is explicit. It places brands in listicles, Reddit threads, industry publications and other sources AI systems frequently pull from, alongside the manual link building it runs for SEO. Tracking is weekly through custom dashboards that show citations, mentions, LLM traffic and conversions, with key prompts retested monthly.
What stands out
- Third-party placements, including listicles and Reddit, as part of the service
- Weekly dashboards that include LLM traffic and conversion data
- Product-led content for software companies at the core of its work
Worth knowing
- No pricing is published on its LLM SEO page, so expect a discovery call.
- Its case studies and testimonials are mostly SaaS and software, so other sectors should ask for relevant examples.
No. 7
7. Loganix
- Best for
- Agencies that want LLM SEO delivered white label under their own brand
- Based in
- Vancouver, British Columbia, Canada
Loganix sells LLM SEO two ways: as a managed agency for businesses, and as a fulfilment team for design and marketing agencies that want to offer AI search work without hiring for it. Agency partners get access to account managers and LLM SEO strategists, markup-ready pricing, white-label reports and deliverables, and can choose whether Loganix stays silent or joins client calls.
For direct clients it offers one-to-one strategy calls, custom LLM optimisation campaigns and a dedicated account manager in Slack, with month-to-month terms and an always-on reporting dashboard. Its wider catalogue of link building and local SEO services, such as citation audits, can be bought à la carte if you want to test the relationship first.
What stands out
- Built for agency fulfilment, with white-label reporting
- Month-to-month for direct clients
- Link building and local citation services from the same supplier
Worth knowing
- Its LLM SEO page explains how it works with you rather than listing fixed monthly deliverables, so ask for a written scope.
- Pricing for LLM SEO is quoted rather than published.
How to choose an LLM SEO agency
First decide whether your problem is visibility or accuracy. If models simply do not mention you, you need answer-first content, clean facts and mentions on the sites they already cite, which is where DoodleWeb, Found and SEO Engico concentrate. If models mention you but get things wrong, describe an old product or repeat a stale negative story, you need source-level and reputation work, which is where Five Blocks and The AI SEO Agency put their weight.
Then ask exactly who does the off-site work and how. Wikipedia has strict rules on conflicts of interest, so any agency touching it should explain how it works within them, as Five Blocks does. Community and forum work should be genuine participation, not invented posts. And if you are an agency yourself, decide early whether you want a partner who works under your brand, like Loganix, or one who deals with your client directly.
Questions to ask before you sign
- What do the main models currently get wrong about us, and how will you show us?
- Which of our problems sit in what models learned and which in what they retrieve?
- Which third-party sites will you work on, and who does that work?
- How many runs per question do you use, and do you report each model separately?
- What does it cost, what is the term, and what do we own if we leave?
Frequently asked questions
What is LLM SEO?
LLM SEO is the work of improving how large language models such as ChatGPT, Claude and Gemini understand, describe and recommend your brand. It covers your own pages and structured data, consistent facts across profiles and listings, and the third-party sources models learn from and retrieve, such as reviews, press, forums and reference sites.
Is LLM SEO the same as GEO or AEO?
Mostly, though agencies draw the lines differently. DoodleWeb treats LLM SEO, AEO and GEO as labels for the same job. The AI SEO Agency treats LLM SEO as the underlying data layer, AEO as the work of getting named in answers, and GEO as the umbrella over both. What matters is the work listed, not the label.
Where do language models get their information about a brand?
From two places: what they learned in training and what they retrieve when they search the web. Both lean heavily on sources outside your control. Five Blocks' research on 24,675 AI answers about Fortune 100 companies found that 82% cited the company's own website and 56% cited Wikipedia, which shows how much reference sites matter.
How much does an LLM SEO agency cost?
Published prices on this list start at $1,200 a month for DoodleWeb's Core plan and £1,000 a month for The AI SEO Agency's Standard tier, rising to $2,500 and £5,000 for fuller programmes. SEO Engico includes AI search work in its $4,500 a month SEO retainer. Reputation-led work for large companies is usually quoted.
Can an LLM SEO agency fix wrong information about my brand?
It can fix the sources, not the model. Agencies correct your own pages and profiles, work on reviews, listings and reference entries within their rules, and earn fresh coverage. Answers that come from live search can improve once those sources change. Answers from training data only update when a newer model is released.
Our verdict
Pick SEO Engico if you want LLM SEO run as part of one search programme, with your own pages fixed and the sites models trust worked on by an in-house links team, measured against calls, enquiries and revenue. Choose Five Blocks if reputation is the real issue, The AI SEO Agency for tiered source-level work, Found if you are an established UK brand, DoodleWeb for a published monthly price, Embarque if you sell software, and Loganix if you are an agency that needs LLM SEO under your own name.
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