Which AI Search Optimization Services Actually Earn Their Fee

A July 2025 Pew Research panel study tracked about 900 U.S. adults across nearly 69,000 Google searches and found that when an AI summary appeared above the blue links, users clicked a traditional result just 8% of the time, roughly half the rate of sessions with no summary at all. Sessions also ended sooner. Vendors read that study and arrived at the same pitch. Call it AI search optimization services, generative engine optimization, or answer engine SEO; the decks look similar. The invoices do not all buy the same thing. ChatGPT, Perplexity, and Google AI Overviews rank with different corpora, cite different sources, and respond to different inputs. Treating them as one line item is how you overpay. The sections below break each engine out as a separate buying decision, so you can tell which SKUs move citations and which are repackaged AI SEO services.

Google AI Overviews Compress the Click

Google rolled AI Overviews across more than 200 countries and 40 languages by May 2025. That scale makes the AIO box the default state of a Google result page for most commercial English queries. The first line item to interrogate on any Google AI Overviews optimization quote is whether it buys structural change or whether it buys more of the content that would ship under a traditional retainer.

The services that genuinely move AIO citations share a short mechanic list. Entity consolidation so Google can resolve your brand to a single Knowledge Graph node. FAQ and HowTo schema on the exact URLs you want pulled into the summary. A Knowledge Panel-grade author profile attached to the content. Internal linking that collapses thin duplicates into the canonical source. Page-level edits that put a direct, quotable answer in the first hundred words of the body.

The services usually sold under the same label but which are not moving the needle: generic blog posts written for queries the AIO now answers inside the summary, bulk link packages, and brand-monitoring dashboards that report citation rate without any mechanism to change it. If the vendor cannot name which schema change, entity edit, or placement preceded a tracked citation lift, the dashboard is theater. Our breakdown of how SEO and GEO duties actually differ is the fastest way to sort the line items on an inbound proposal.

ChatGPT Optimization Buys Scale Without a Click Log

Sam Altman told the OpenAI DevDay audience in October 2025 that ChatGPT had reached 800 million weekly active users. That is larger than any single search property outside Google, and it is also the engine with the least visible citation trail. The browsing tool cites live sources on the page; the closed-model answer, which still handles the majority of conversations, does not. Anyone selling ChatGPT SEO is selling influence over a surface where you cannot see every mention your brand earns.

The honest SKUs lean into that opacity instead of pretending it away. They buy mentions on the domains the retrieval tool and training corpus favor, which means Reddit, Wikipedia, substantive news, and YouTube transcripts. They clean up entity disambiguation so the model does not blend your brand with a competitor. They add short, lift-ready facts on your site in sentences the model can quote. They run a structured prompt audit every week against the same query basket, so you can see citation drift against a fixed denominator. Our walkthrough on getting recommended by ChatGPT covers the basket itself.

The repackaged SKUs are easy to spot. "AI brand monitoring" with no fulfillment plan for the missing citations the report surfaces. Prompt-engineering packages that produce no edit to any page or off-site asset. Generic content retainers rebadged as GEO because the deliverable now mentions LLMs. The test is uniform across engines: can the vendor point to the specific change that preceded the drift in citation rate.

Perplexity Is the Citation-Heavy Buy

Perplexity is the cleanest answer engine to optimize for, because it shows its sources. It also pushed itself into a wider surface area through this year's Comet browser rollout across Windows, macOS, Android, and iOS, which moves ranking logic out of a chat box and into a browsing agent that answers while a user shops. The SKU list changes accordingly.

Vendors doing Perplexity SEO well are buying measured presence in Reddit communities relevant to the query basket, YouTube transcripts with on-page schema tied to the prompts customers actually run, structured question-and-answer blocks on product pages, author bios that attach to the author's work across the retrieval set, and placements on the handful of news and reference domains that make the cited top 100. They also wire up citation tracking against the exact prompts a sales team cares about, not a blended report.

The repackaged SKUs are more obvious here, because the citation log is public. The vendor is either in the citation list or is not. If a quarterly report shows no change in your domain's appearance across a tracked query basket, the invoice is not buying citations. It is buying content. That distinction mirrors the service split explained in where AEO and SEO overlap, and it is the clearest way to audit a Perplexity line item against a traditional SEO one.

What a Defensible GEO Invoice Looks Like

First Page Sage's October 2026 study put the median GEO and AEO retainer at $6,850 per month, about 45% above the median traditional SEO retainer. That delta is the question you have to answer on every proposal. If your vendor is charging a GEO premium, the line items need to look different from the SEO retainer they would quote the same company six months ago. A defensible GEO pricing structure names:

• Entity and schema work on specific URLs, with a before-and-after diff the engineering team can verify.
• Off-site placements on domains the engines actually cite, with the prompt basket each placement targets.
• An author and brand knowledge graph effort tied to a named author file, not a generic persona.
• A tracked prompt-and-citation report against a query basket you approved on signing.
• A share-of-voice metric broken out per engine, so the Google number does not hide Perplexity decline.

If the invoice names only blog posts, generic link packages, and a monthly PDF, the premium is being charged for traditional work with a new cover sheet. Agencies that do the overlap well tend to charge the same thing for both engines, because the underlying mechanics are shared. Agencies that charge twice are selling two invoices for one body of work.

The Shift to Watch Over the Next Year

The surface moving most under the next twelve months is Google itself. AI Mode and the continued expansion of AI Overviews into higher-intent commercial queries will keep compressing click volume, which will shift budget from "rank the page" to "earn the citation" across every SKU in this comparison. Perplexity's Comet rollout adds a second compression, because the user never sees the SERP at all when a browsing agent answers in place. Vendors who can point to a specific schema change, a specific off-site placement, or a specific entity edit that preceded a citation shift will keep their retainers through that transition. Vendors who cannot will spend the year explaining why a blended dashboard flattened without any line item moving.