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AEO vs SEO: What Actually Changes, and What Transfers

Updated September 2026 · Written and maintained by the Progression Agency strategy team

They are not alternatives. Answer engines retrieve from the indexes SEO builds, so the dependency runs one way — and only two workstreams are genuinely new.

On this page · 26 sections
  1. What is the difference between AEO and SEO?
  2. Is AEO replacing SEO?
  3. Is AEO just SEO with a new name?
  4. What transfers from your existing SEO?
  5. What does not transfer, and actively hurts?
  6. Why does the result surface change everything?
  7. What is genuinely new in AEO?
  8. How should you split budget between AEO and SEO?
  9. In what order should the work happen?
  10. How do you measure each one?
  11. Which should a business do first?
  12. Does AEO work without good SEO?
  13. Does SEO work without AEO?
  14. What about GEO and LLM SEO — where do they fit?
  15. What are the common myths?
  16. Can you buy placement in an AI answer?
  17. Do backlinks still matter?
  18. Does schema help with AEO?
  19. Does llms.txt change anything?
  20. How long does each take to show results?
  21. Who should own this work?
  22. What should you ask a provider about both?
  23. Is AEO worth doing at all yet?
  24. What happens if you only do SEO?
  25. What happens if you only do AEO?
  26. More from Progression Agency

The short answerSEO gets a page indexed and ranked among ten links. AEO gets a passage from that page selected and quoted inside an AI answer that names three or four sources. AEO depends on SEO and cannot replace it, because a page that is not indexed cannot be retrieved. Most of your existing SEO transfers directly. Only two things are genuinely new: a second set of crawlers, and a rendering standard far stricter than Google’s.

Updated September 2026. Crawler names and assistant behaviour change; the technical checks here are re-verified quarterly.

Why AEO and SEO are not alternativesWhy AEO and SEO are not alternatives
You can do excellent SEO and be entirely absent from AI answers. You cannot do AEO on a site nobody indexes.

What is the difference between AEO and SEO?

SEO gets a page into a search index and ranked among ten links. AEO gets a passage from that page selected and quoted inside an AI-generated answer that names three or four sources. They are not alternatives — AEO depends on SEO, because answer engines retrieve from the indexes SEO builds.

That dependency runs one way and only one way. You can do excellent SEO and be completely absent from AI answers, which is the position most sites are in. You cannot do AEO on a site nobody has indexed, because there is nothing to retrieve.

Two opposite mistakes are common. The first is treating AEO as a replacement and moving budget out of SEO, which removes the foundation. The second is treating AEO as SEO with a new name, which misses the two things that genuinely are new: a second set of crawlers, and rendering requirements far stricter than Google’s.

Indexation — Shared. Both need it; SEO delivers it.
Site health — Shared. Speed, architecture, crawl budget.
Internal linking — Shared. Helps discovery in both.
Crawler access — AEO only. A second set of bots entirely.
JS rendering — AEO stricter. Google copes; AI crawlers often do not.
Passage structure — AEO decisive. Retrieval selects passages, not pages.

Is AEO replacing SEO?

No. Answer engines retrieve from web indexes, so removing the SEO work removes the thing AEO stands on. Anyone selling AEO as a replacement is describing a dependency as an alternative.

Is AEO just SEO with a new name?

Also no, and this is the opposite error. Two workstreams are genuinely new: allowing and verifying a second set of crawlers, and making pages render without JavaScript to a standard Google never required.

Where the two disciplines actually divergeWhere the two disciplines actually diverge
1 = low dependence, 3 = high. Only two rows genuinely differ: rendering strictness and passage structure.
AEO and SEO, side by side
SEOAEO
What it optimises forRanking among ten linksBeing quoted as one of three or four sources
Unit of competitionThe pageThe passage
CrawlersGooglebot, BingbotPlus GPTBot, OAI-SearchBot, ChatGPT-User, PerplexityBot, Google-Extended, ClaudeBot
JavaScript renderingHandled reasonably wellOften not executed at all
Tail visibilityPosition 8 still earns clicksAbsent from the answer means invisible
Primary authority signalLinksLinks plus direct third-party corroboration
MeasurementRank tracking; repeatablePrompt sampling; varies between runs
Paid optionAds alongside resultsNone exists
Depends on the otherNoYes — needs indexation

What transfers from your existing SEO?

Most of it. Indexation, crawl health, site architecture, page speed, internal linking and genuine topical authority all serve both channels from the same work.

This is the reassuring part of the answer and the part agencies selling AEO as a separate product tend to skip. If you have been doing competent technical SEO, you have already built the foundation. What you have not done is the two things nobody had to do before.

Crawl health — Transfers. Directly and fully.
Architecture — Transfers. Directly and fully.
Page speed — Transfers. Matters more, if anything.
Topical authority — Transfers. Genuine depth counts in both.
Keyword density — Does not. Retrieval is not term-frequency matching.
Publishing cadence — Does not. Volume dilutes what could be cited.
What transfers from your existing SEO, and what does notWhat transfers from your existing SEO, and what does not
The good rows are most of your SEO programme. The bad rows are habits that actively hurt in answer engines.

Indexation and crawl health

Transfers completely. An answer engine cannot retrieve what is not in an index, so this is the shared floor.

Site architecture

Transfers completely. Pages reachable in a few clicks are discoverable by both kinds of crawler.

Page speed

Transfers, and matters slightly more. Retrieval has tighter timeouts than indexing, so a slow page is sometimes not fetched at all.

Internal linking

Transfers completely, and is one of the cheapest things that helps both.

Topical authority

Transfers, provided it is genuine depth rather than published volume.

Schema markup

Transfers with a caveat: markup that contradicts the visible page is worse than none in answer engines.

What does not transfer, and actively hurts?

Keyword density habits, publishing to a cadence, and using rank tracking as the measure of success. All three are holdovers that make AEO performance worse rather than merely neutral.

Keyword density

Retrieval works on meaning rather than term frequency. Repeating a phrase makes a page harder to read and no easier to retrieve.

Publishing to a cadence

Volume produced to hit a number dilutes the pages that could have been cited and consumes budget that should have gone to rendering and structure.

Rank tracking as the KPI

There is no ranked list inside an AI answer. A rank tracker has nothing to track, so a programme measured that way will report success while being invisible.

‘Position 8 is fine’

In search it earns clicks. In an answer naming four sources, there is no position 8 — you are named or you are not.

Thin location or service pages

Templated near-duplicates were always weak in search. In retrieval they are worse, because there is no distinctive passage to select.

Gated or JavaScript-assembled content

Acceptable in search if Googlebot renders it. Often fatal in answer engines, which frequently do not.

How the result surface differsHow the result surface differs
Google shows ten links; an assistant names three or four sources. There is no page two, so position 8 stops existing.

Why does the result surface change everything?

Google shows ten links and a second page. An assistant names three or four sources and there is no second page. The long tail of positions simply stops existing, which is why ‘we rank on page one’ and ‘we appear in AI answers’ are different claims.

Ten blue links — SEO. Position 8 still earns clicks.
Three or four sources — AEO. Absent from the answer means invisible.
Repeatable rankings — SEO. A rank check repeats.
Varies between runs — AEO. Sampling is required for meaning.
Links as authority — SEO. Primary signal.
Corroboration as authority — AEO. What others say, directly.

What is genuinely new in AEO?

Two things: a second set of crawlers that conventional SEO never had to consider, and a rendering standard far stricter than Google’s. Everything else is emphasis on things that already mattered.

Where the incremental AEO work sitsWhere the incremental AEO work sits
Only the first two are genuinely new disciplines. The rest is emphasis on things SEO already touched.

The second crawler set

GPTBot, OAI-SearchBot, ChatGPT-User, PerplexityBot, Google-Extended and ClaudeBot. No conventional SEO audit checks these, and sites block them by accident far more often than deliberately.

The rendering standard

Google renders JavaScript reasonably well. Many AI crawlers execute little or none, so a fault that costs a little in search costs everything in an answer. We have measured a page ranking on the first page for a competitive term that returned three words with JavaScript disabled.

Emphasis: passage structure

Always good practice; now decisive, because retrieval selects passages rather than whole pages.

Emphasis: corroboration

Always mattered through links; now matters directly, because assistants weigh what third parties say about you.

Emphasis: entity consistency

Always untidy; now produces visibly wrong answers about your business.

New instrument: prompt sets

Rankings do not exist inside an answer, so measurement moves to a fixed list of prompts re-run unchanged.

How should you split budget between AEO and SEO?

By your actual constraint, not by a percentage. If the site is unhealthy, all of it goes to SEO because nothing else can work. If the site is healthy but the crawlers are blocked, the AEO fix costs hours and returns more than anything else available.

Anyone quoting you a fixed split — thirty percent AEO, seventy percent SEO — is not diagnosing, because the correct answer depends entirely on which gate you are currently failing.

How to split the budgetHow to split the budget
There is no fixed percentage. The split follows the constraint you actually have.
What to spend on, by the constraint you actually have
Your situationSpend onNot onWhy
Pages not indexedSEO technicalAnything elseNothing can be retrieved
Indexed but AI crawlers blockedAEO access fixMore contentMinutes of work, binary effect
Pages empty without JavaScriptRenderingMore contentThe crawler reads a shell
Technically sound, never citedStructure and corroborationTechnical auditsThe constraint has moved
Cited but no trafficCitation quality and linkingMore promptsMentions are not clicks
Both sound and performingMeasurement and depthRebuildingProtect and extend
The order to do both inThe order to do both in
Steps 1, 4 and 5 serve both channels. Only steps 2 and 3 are AEO-only.

In what order should the work happen?

Fix suppression first, unblock crawlers second, fix rendering third, restructure fourth, build corroboration continuously. Three of those six steps serve both channels; only two are AEO-only.

Unblock AI crawlers — Do first. Minutes; binary effect.
Render without JavaScript — Do second. The expensive failure.
Answer-first rewrite — Do third. Largest editorial gain, helps both.
Fix indexation — SEO, always first. Nothing works without it.
Corroboration — Ongoing. Slow, durable, serves both.
Measure separately — Always. Merging the two hides weak work.
  1. Confirm nothing is suppressing the site — stray noindex, broken canonicals, blocked crawl.
  2. Allow the AI crawlers by name and prove from ninety days of logs that they arrived.
  3. Fetch every commercial template with JavaScript disabled and read what remains.
  4. Fix any template that returns an empty shell.
  5. Rewrite so each section answers its own heading in the first sentence.
  6. Reconcile schema with what the page visibly says.
  7. Write one canonical description of the business and apply it everywhere.
  8. Start corroboration — coverage, listings, client-hosted case studies.
  9. Take a dated baseline against a fixed prompt set before claiming anything.
  10. Report rankings and prompt-set results separately, with separate confidence.
Effort against payoff across both disciplinesEffort against payoff across both disciplines
The two cheapest high-payoff items are one SEO task and one AEO task.

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How do you measure each one?

Separately, and that separation is not pedantry. SEO measurement is close to deterministic — a rank check repeats. AEO measurement is sampled from a system that answers differently between runs, so a single observation proves nothing.

Merging them into one number is how weak programmes hide. A report showing crawler access improving and calling it visibility is describing an input as an outcome.

Two measurement systems, kept apart
SEO measurementAEO measurement
InstrumentRank tracking, Search ConsoleA fixed prompt set, re-run
DeterminismBroadly repeatableVaries between runs by design
UnitKeyword positionMention and citation rate
ConfidenceHighProbabilistic; needs repetition
CadenceWeekly or dailyMonthly, identical wording
Honest reportSeparate sectionSeparate section, stated confidence

Which should a business do first?

SEO if the site is unhealthy. Otherwise both at once, because the two cheapest fixes in the whole field — unblocking crawlers and fixing rendering — are AEO work that takes hours.

Does AEO work without good SEO?

Barely, and only on live-fetching surfaces. Index-led surfaces cannot retrieve an unindexed page at all, so the ceiling is very low.

Does SEO work without AEO?

Yes, for search traffic — and it leaves AI answers entirely on the table. That is the situation most sites are in and the reason this question is being asked at all.

What about GEO and LLM SEO — where do they fit?

They are the same discipline under different labels. GEO emphasises the generative surface, LLM SEO the model and retrieval layer, AI SEO is what most buyers type. None of them changes the relationship with SEO described on this page.

Every label, and what it emphasises
TermEmphasisRelationship to SEO
AEOBeing the answer rather than the linkDepends on it
GEOThe generative surfaceDepends on it
LLM SEOThe model and retrieval layerDepends on it
AI SEOContinuity with familiar SEODepends on it
AI search optimizationThe search surface specificallyDepends on it
SEORanking in an indexStands alone
AEO replaces SEO — Myth. The dependency runs the other way.
AEO is just SEO renamed — Myth. Crawler access and rendering are genuinely new.
Move budget out of SEO — Myth. You would remove the foundation.
Rank tracking measures AEO — Myth. There is no ranked list inside an answer.
More content wins AEO — Myth. Clarity concentrates; volume dilutes.
You can buy AI placement — Myth. No inventory exists.
Claims about AEO versus SEO, sortedClaims about AEO versus SEO, sorted
Two opposite errors are common: that AEO replaces SEO, and that AEO is nothing new. Both are wrong.

What are the common myths?

That AEO replaces SEO, that AEO is nothing new, that you should shift budget wholesale, that rank tracking measures AEO, that more content wins it, and that placement can be bought. None survives contact with a log file.

Can you buy placement in an AI answer?

No. There is no advertising inventory inside a ChatGPT answer today, no submission process and no paid tier that changes standing. That absence is exactly why the technical work has leverage.

Yes, in both — indirectly through indexation and authority, and directly in answers because third-party mentions function as corroboration in their own right.

Does schema help with AEO?

When it agrees with the visible page. Markup that contradicts the copy is worse than none, because it undermines confidence in everything else.

Does llms.txt change anything?

Very little today. Adoption is limited and it is not a ranking factor. It belongs in the same category as a well-formed sitemap: hygiene rather than leverage.

How long does each take to show results?

Crawler access shows in logs within days — faster than anything in SEO. Rendering and structure take weeks. Citation frequency moves over months, which is comparable to SEO.

Who should own this work?

One team, inside the search programme. Splitting AEO into a separate budget with a separate agency produces duplicate technical work and two reports that disagree about the same site.

Is our site indexed properly? — Ask. The SEO question.
Can GPTBot reach us? — Ask. The AEO question.
Do our pages render without JS? — Ask. The expensive one.
Does each section answer its heading? — Ask. The editorial one.
Who else says what we say? — Ask. The corroboration one.
What are we measuring, separately? — Ask. The honesty one.

What should you ask a provider about both?

Six questions, three of which are ordinary SEO questions and three of which most SEO agencies have never been asked.

Is our site indexed properly, and what is suppressing it?

The SEO question. Any competent agency answers it immediately.

Which AI crawlers will you test, by name?

The AEO question. A vague answer about ‘AI bots’ means nobody has opened a log file.

Will you render our templates without JavaScript and show us?

Ten minutes per template, and it finds the most expensive failure there is.

Does each section answer its own heading?

The editorial question, and it serves both.

Who else says what we say about ourselves?

The corroboration question, increasingly the binding constraint once the technical work is done.

What will you measure, separately, before starting?

Rankings and a dated prompt set. Merged reporting is the warning sign.

The corroboration question, increasingly the binding constraint once the technical work is done.

Is AEO worth doing at all yet?

For B2B, professional services, healthcare and SaaS, yes — buyers there increasingly shortlist by asking an assistant. For local trades and real estate, profile and listing work still returns more today.

The honest framing is that AI referral traffic is real, growing and currently small — measured at around one per cent of all website traffic in the largest study with a stated denominator. The reason to act now is that the cheapest fixes are cheap now and the positions are uncontested now, not that the traffic has already arrived.

What happens if you only do SEO?

You collect search traffic and leave AI answers entirely on the table. That is the default position of most sites today, and it is stable rather than catastrophic — until competitors in your category start being cited and you are not.

The short-term effect

None visible. Search traffic continues exactly as before.

The medium-term effect

Competitors who fixed access and rendering start accumulating citations you never see, because nothing in your reporting looks at answers.

The signal to watch

Ask the assistants your buyers’ questions once a month. If competitors appear and you do not, the gap has opened.

What it costs to close later

More than closing it now, because the cheap fixes stay cheap but the positions stop being uncontested.

More than closing it now, because the cheap fixes stay cheap but the positions stop being uncontested.

What happens if you only do AEO?

Very little, on index-led surfaces. A page that is not indexed cannot be retrieved into an answer, so AEO without SEO has a low ceiling regardless of how well the page is written.

On live-fetching surfaces

Some effect. Perplexity fetches at question time and can reach a page even where indexation is weak.

On index-led surfaces

Almost none. Google’s AI surfaces draw on the Google index, so an unindexed page is simply not a candidate.

Why it is still the wrong order

You would be optimising passage structure on pages nothing can retrieve.

The exception

A small, healthy, already-indexed site. There, the AEO work is nearly all of the remaining opportunity.

AEO versus SEO, in numbersAEO versus SEO, in numbers
Everything else on this page follows from the last two rows.

Want to know which gate you are actually failing?

A fixed-scope audit answers it: crawler access from your server logs, render testing per template, structure and entity findings, and a dated baseline. You keep all of it.

/ai-visibility-audit

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Choosing and working with an agency

Social, content and brand

By industry and by situation

Not sure which of these applies to you?Tell us the situation and we will say plainly what we would do first, and what we would not.

Talk it through

Getting found in search

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By industry and by situation

Frequently asked questions

What is the difference between AEO and SEO?
SEO gets a page indexed and ranked among ten links. AEO gets a passage from that page selected and quoted inside an AI answer naming three or four sources. AEO depends on SEO, because answer engines retrieve from web indexes.
Is AEO replacing SEO?
No. The dependency runs one way: answer engines retrieve from indexes that SEO builds and maintains. Removing the SEO work removes the foundation.
Is AEO just SEO with a new name?
No. Two things are genuinely new — a second set of crawlers, and a rendering standard far stricter than Google’s. The rest is emphasis on things that already mattered.
Can I do good SEO and still be invisible in AI answers?
Yes, and most sites are. Conventional SEO never checks whether GPTBot can reach you or whether your pages render without JavaScript.
What transfers from my existing SEO?
Indexation, crawl health, site architecture, page speed, internal linking and genuine topical authority. That is most of a competent technical programme.
What does not transfer?
Keyword density habits, publishing to a cadence, and rank tracking as the success measure. All three make AEO performance worse rather than neutral.
How should I split my budget?
By the constraint you actually have. Unhealthy site: all SEO. Healthy but blocked crawlers: the AEO fix costs hours and returns most. Anyone quoting a fixed percentage is not diagnosing.
Which should I do first?
SEO if the site is unhealthy, because nothing else can work. Otherwise both — the two cheapest fixes available are AEO work taking hours.
How is AEO measured differently?
Against a fixed prompt set re-run with identical wording, because there is no ranked list inside an AI answer for a rank tracker to track.
Can rank tracking measure AEO?
No. A programme measured that way will report success while being entirely absent from answers.
How many results does an AI answer show?
Typically three or four named sources. There is no second page, so the long tail of positions does not exist.
Does position 8 matter in AI answers?
There is no position 8. You are named or you are not, which is the single biggest structural difference from search.
Do backlinks still matter for AEO?
Yes — indirectly through indexation and authority, and directly because third-party mentions function as corroboration.
Does schema markup help AEO?
When it agrees with the visible page. Markup contradicting the copy is worse than none.
Does llms.txt matter?
Very little today. Low adoption, not a ranking factor. Hygiene rather than leverage.
Does keyword density matter for AEO?
No. Retrieval works on meaning rather than term frequency.
What is the most common AEO failure?
Content that only exists after JavaScript runs. It looks perfect in a browser and returns almost nothing to the crawlers that matter.
What is the cheapest AEO fix?
Unblocking crawlers that were disallowed by accident. Minutes of work, and it is the difference between being a candidate and being absent.
How long does each take to show results?
Crawler access shows in logs within days, faster than anything in SEO. Rendering and structure take weeks. Citation frequency moves over months.
Should AEO be a separate budget line?
No. It belongs inside the search programme. Splitting it produces duplicate technical work and two contradictory reports.
Should I hire a separate AEO agency?
Usually not. Ask your existing SEO agency the AEO questions first — many competent agencies can do this and simply have not been asked.
What about GEO and LLM SEO?
Same discipline, different labels. GEO emphasises the generative surface, LLM SEO the retrieval layer, AI SEO is what buyers type. None changes the relationship with SEO.
Can I buy placement in an AI answer?
No. There is no ad inventory, no submission process and no paid tier. That absence is why the technical work has leverage.
Is AEO worth doing yet?
For B2B, professional services, healthcare and SaaS, yes. For local trades and real estate, profile and listing work still returns more today.
How much AI referral traffic is there actually?
Around one per cent of all website traffic in the largest study with a stated denominator. Real, growing, and currently small.
What should I ask an agency about both?
Whether they want your server logs, which crawlers they test by name, whether they will render your templates without JavaScript, and what they measure separately before starting.

Want this done for your site?We build and maintain the search, content and paid programmes described on this page.

Get a free proposal

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