You sell a fragrance-free facial moisturizer and want to reach a shopper asking an AI assistant to compare skincare options for sensitive skin. Before you assign a budget, you need to know whether your account can reach that moment, whether you can choose the placement, and what you will pay when the ad appears or the customer acts.
ChatGPT, Google, and Microsoft can all put a sponsored message into an AI-assisted decision. The merchant’s control and financial risk differ: some placements are eligible through existing campaigns, some are pilots, and a conversion goal does not necessarily mean a conversion creates the charge. The comparison below follows each option from access to bill to proof of result.
Last checked: October 14, 2026. This is a review of the linked public platform documentation, not an account-level test or a claim of first-hand campaign results. Availability, policies, billing, and reporting can differ by account and market; confirm them before committing a budget.
Placement, Optimization, and Billing Are Different Decisions
Placement describes where the paid message can appear. Optimization describes what the delivery system tries to produce. Billing identifies the event that creates a charge. A campaign can optimize for purchases and still bill for clicks or impressions.
OpenAI provides a clear example: eligible ChatGPT Ads campaigns with a Conversions objective can use click or impression billing. They are not billed per conversion. Google gives a similar example of a cost-per-click campaign using target CPA bidding: the system seeks conversions, while the advertiser is charged for clicks.
Keep a fourth question in view: what counts as a business result? A platform-attributed purchase, a billable event, and a profitable new customer are three different things.
Where Can a Merchant Advertise in AI Experiences?
These are the major platform-owned options documented publicly as of the date above. Eligibility to appear is not the same as a dedicated placement you can buy or report on separately.
PingPlus publishes this guide and offers the performance models discussed later. Each platform row below links to that operator’s own documentation; PingPlus’s delivery and billing model is described separately.
| Platform | Where ads may appear | What creates the charge | What the merchant cannot assume |
|---|---|---|---|
| ChatGPT Ads | Labeled ads may appear below a response for eligible users. Advertisers access Ads Manager where available or work through supported sales or partner routes. | Impressions with CPM buying or clicks with CPC buying. A conversion-optimized campaign still uses its selected impression or click billing option. | Advertiser access does not mean every customer in that country can see ads. Paying does not change ChatGPT’s answer. |
| Google Ads | Eligible existing campaigns may show ads above or below AI Overviews. A narrower set of ads may appear within an Overview. Google is also testing sponsored formats in AI Mode. | The terms of the eligible campaign or pilot apply. An AI placement does not create a universal pay-per-sale billing rule. | You cannot buy or report on ads within AI Overviews as a separate placement. AI Mode tests do not mean every advertiser has access. |
| Microsoft Advertising | Microsoft uses assets from eligible Search campaigns and also points advertisers to Performance Max. Retail Offer Highlights can add merchant-provided differentiators to relevant ads. | Check the underlying Microsoft Advertising campaign terms. Search campaigns typically use CPC; there is no single, separately documented Copilot pay-per-sale rule. | Running a campaign with a conversion goal does not guarantee a Copilot appearance or a separately purchasable Copilot placement. |
ChatGPT Ads
OpenAI says ChatGPT ads are labeled, visually separate from responses, and do not influence the answers. The same guide says ads may appear to eligible users on Free and Go plans in selected regions. Check advertiser availability separately from user eligibility: the legal entity able to use self-service Ads Manager and the audience able to see ads are different questions.
Advertisers can measure supported conversion events using OpenAI’s Pixel or Conversions API. That measurement helps assess a campaign; it does not turn a click- or impression-billed campaign into pay-per-sale advertising. Confirm the objective, billing option, attribution settings, and data requirements in the account you will actually use.
Google Ads
You buy through Google Ads campaigns, not through a separate AI Overviews product. Google says eligible ads from existing campaigns can appear above or below AI Overviews in the more than 200 markets where AI Overviews are available. Ads within an Overview have a narrower scope: Google lists English-language availability in Australia, Canada, India, Indonesia, Kenya, Malaysia, New Zealand, Nigeria, Pakistan, the Philippines, Singapore, and the United States. It also says advertisers cannot target only that within-Overview placement or see its performance as a separate segment. The same guide excludes sensitive categories such as alcohol, finance, and healthcare from ads within AI Overviews; category eligibility belongs in the account check, not just the geography check.
AI Mode is a further distinction. On May 20, 2026, Google described new sponsored formats and an expanded Direct Offers pilot. Some formats can sit inside an AI-assisted shopping or research flow. A merchant should ask which formats are accessible to its account, category, and market, and what reporting is available before putting a pilot into a forecast.
Microsoft Advertising
Microsoft says it draws on existing Search campaign assets for ads in Copilot and recommends Performance Max as another route. Its April 21, 2026 update describes AI Max for Search as a way to match more relevant queries on Copilot surfaces, while Offer Highlights let eligible retailers provide product differentiators such as free shipping or pickup information. Neither an AI-powered matching feature nor a conversion target tells you which event will be billed. Review the campaign’s actual pricing and available placement reporting.
Choose the Billable Event Your Business Can Verify
Work backward from a valuable customer, not forward from the name of an AI feature. A click can test demand quickly, but many clicks will not become customers. An install is more meaningful for an app, though activation and retention determine its value. A defined lead or booking gets closer to revenue if the qualification rules are clear. A confirmed sale is closer still, but requires dependable order and refund records.
Suppose the skincare retailer expects $45 in contribution profit from a first order and needs to retain $15 after acquisition cost. That leaves at most $30 for acquiring that order under those assumptions. If only 5% of paid clicks become qualifying first orders, an illustrative break-even planning ceiling is $1.50 per click. The figures are hypothetical, but the calculation exposes the decision: a $1 click is not automatically cheap, and a $20 confirmed-sale charge is not automatically expensive.
For impression billing, use the same customer denominator. At a hypothetical $20 CPM, 1,000 impressions cost $20. If 2% lead to a click and 5% of those clicks produce a qualifying order, that is one order and a $20 media cost per order, before returns or other costs. Replace every assumed rate with your own recorded numbers before judging CPM against CPC or CPS.
The same discipline applies to later events. Before using sale-based billing, decide whether a sale counts at checkout, payment capture, or after a cancellation period. Define duplicate orders, refunds, attribution windows, and the record used to resolve disagreements. Even a correctly billed sale can be unprofitable after discounts, fulfillment, and returns.
Why Merchants Choose PingPlus
ChatGPT, Google, and Microsoft each sell access under their own campaign rules. PingPlus starts with the merchant’s offer and the customer action worth paying for. Its one-campaign approach can carry the same approved offer and spending rules across the AI-assisted delivery options supported for that campaign.
One offer and one set of campaign rules
For that moisturizer, the offer might specify its ingredients, size, price, stock, shipping markets, and purchase page. In PingPlus’s campaign workflow, the skincare retailer adds the eligible market, daily budget, target cost, and customer action. If more than one AI-assisted delivery route is supported for that campaign, the same approved offer and rules can guide those routes. The merchant does not need to create a separate banner, keyword list, or placement list for this workflow.
That is the practical cross-route advantage: one offer to keep accurate and one set of spending limits to manage. It does not establish access to every AI assistant or a named ChatGPT, Google, or Copilot ad slot. Confirm the actual routes, markets, and category rules for your offer; PingPlus does not control an assistant’s independent answer.
Choose the event that creates the bill, including a confirmed sale
With PingPlus CPS, an impression or click does not itself create a charge. A sale that meets the campaign’s agreed confirmation rule does. That is a meaningful difference for a merchant whose priority is orders rather than visits. PingPlus also offers CPC, CPI, and CPA when an earlier event better fits the goal or available measurement.
Compare that billing rule with the platform campaign you can actually run. ChatGPT’s current conversion-optimized ads bill for clicks or impressions. Google Ads that appear in AI Overviews and Microsoft Advertising campaigns that appear in Copilot use eligible underlying campaigns, whose billing terms must be checked separately. A purchase optimization goal is not, by itself, a pay-per-sale agreement.
For the skincare retailer with a $30 acquisition ceiling above, CPS can make a confirmed moisturizer order the charge trigger if the target cost fits its margin and it can reconcile orders. The same retailer might use CPC to test which offer attracts qualified visits, or CPA for a defined sample request or sign-up. CPI would apply only if it promotes an app and can verify installs. Choose the deepest event your business can verify reliably, then agree on its exact definition:
| Model | Published billable event | Rule to confirm with the merchant record |
|---|---|---|
| CPC | Eligible click | Which click log is authoritative, and how are invalid or repeated clicks excluded? |
| CPI | Recorded app install | Which app analytics or attribution postback confirms completion, and how are reinstalls or duplicate devices handled? |
| CPA | Completed, defined action | Which CRM or booking status qualifies a lead or booking, and how are test, duplicate, or rejected records treated? |
| CPS | Confirmed sale | Which order and payment status confirms the sale, and what happens after a cancellation, return, or refund? |
Check the result against your own business records
Compare the billed result with the record your business already trusts: an order for CPS, a booking or CRM status for CPA, or app analytics for CPI. PingPlus’s measurement guide calls for agreeing on validation and attribution before launch. A confirmed-sale charge is closer to revenue, but does not by itself prove incremental demand or profit.
If a particular ChatGPT, Google, or Copilot placement is essential, use that platform’s buying route where available. For a PingPlus campaign, confirm the supported routes and billable-result definition for your offer before setting a budget.
Four Checks Before You Fund a Test
Start with one offer whose price, availability, category eligibility, and destination are accurate. In the account or campaign agreement, record four answers before launch:
- Placement: Is this surface directly selectable, merely eligible through an existing campaign, or a limited pilot? Confirm the account, market, and category rules.
- Billing: Which event creates spend, and what are the budget and pause controls? For CPM, translate impressions into an estimated cost per validated customer using your own funnel rates.
- Attribution: What is the lookback window, which identifiers connect the ad to the action, and how are duplicates or later cancellations handled?
- System of record: Which order, CRM, booking, or app record will confirm the result and settle a disputed charge?
Estimate how many validated events your test budget can produce at the target cost. A handful of expected sales is a weak basis for judging a conversion-focused test; ask the operator whether your chosen objective has account-specific data requirements, or begin with an earlier event you can verify more often. Then compare the campaign report with your own records, margin, and refunds before expanding.
Set a pause rule before launch: revise or stop if validated acquisition cost exceeds your ceiling, refunds erase the expected margin, or campaign events cannot be reconciled with your records. The useful comparison is what each route costs per customer your business can confirm and afford, not which interface looks most new.
FAQ
If an AI ad optimizes for purchases, do I pay only when someone buys?
Not necessarily. OpenAI says conversion-optimized ChatGPT ads can still charge for clicks or impressions; a Google campaign can pursue a target CPA while charging for clicks. Optimization is the goal, while billing is the event that creates the charge. With PingPlus CPS, that event is an agreed confirmed sale. Check the actual billing setting or contract before comparing costs.
Can I choose the exact AI placement and see its results separately?
That depends on the operator. Google says ads within AI Overviews cannot be targeted alone or reported as a separate segment. ChatGPT ads may appear below eligible responses under OpenAI’s delivery rules. A PingPlus campaign uses the delivery options supported for that campaign, not a guaranteed reservation of a named platform slot. Ask what your account can reach and what its report can actually isolate.
Is my product eligible for every AI ad format?
Not automatically. Eligibility depends on the platform, market, product category, and the claims in your offer. Google, for example, excludes sensitive categories such as healthcare from ads within AI Overviews. Check the policy and your account’s eligibility for each route before budgeting for that placement. Keep your offer’s claims, price, availability, and destination accurate so it can be evaluated on its merits.
What if a customer buys days later or returns the product?
Set the attribution window and the order status that counts as a sale before launch. A later purchase needs enough evidence to connect it to the campaign; a return or refund needs an agreed rule for changing that status. Under PingPlus CPS, a click alone does not create a charge, but the treatment of a later refund depends on the campaign’s confirmation and reversal terms. Compare the report and bill with your own order records.
How do I compare click-, impression-, and sale-billed campaigns fairly?
Use the same product or offer, market, period, and definition of a valid first order where possible. Convert CPM and CPC spend into cost per order confirmed in your own system, then compare that with a sale-billed campaign’s cost per validated order. Include discounts, fulfillment, and returns before judging margin. A cheaper click and a confirmed-sale charge are different units; the useful comparison is what each route costs for a customer your business can keep.
