To set a Target CPA in ChatGPT Ads, start from what the campaign already achieves: the recent actual cost per conversion for the same event. OpenAI says Target CPA replaces Max Bid when you create a conversion campaign from November 9, 2026 (that evening our account offered both), and Max Bid retires for existing campaigns on January 1, 2027.
- An average, not a cap: some conversions will cost more than the target and some less
- Where to start: your recent actual CPA for the same event, not a number below it
- The B2B ceiling: what a conversion is worth, from your close rate and the ad budget per customer
- Billing does not change: you still pay per click or per 1,000 impressions, never per conversion
- Two deadlines: November 18 for API integrations, January 1, 2027 for every Max Bid and Max CPC campaign
What changed on November 9, and what comes next
OpenAI replaced the per-auction bid ceiling with an average cost target. Its new Help Center article on bidding strategies and pricing, published in the first week of November, sets out four dates. Advertisers got the same news by email, and Search Engine Roundtable reported it on November 5.
Which date matters depends on how you buy. If you create conversion campaigns in Ads Manager, the change is already in front of you, and every older Max Bid campaign has to move by January 1. If anything creates campaigns for you through the API, whether your own code, an agency tool or a management platform, November 18 is the date to check, because from then the old max bid fields quietly create Target CPA campaigns.
This also changes our own advice. In September we told B2B advertisers to opt out of Maximize results by switching to Manual: Max bid, because it was the only setting that held a cost line. That escape hatch is closing. The control that holds a cost line now is a target.
Target CPA is an average, not a cap
Target CPA is the average amount you want to pay per conversion; Max Bid was the most the system could bid in any single auction. OpenAI calls Max Bid and Max CPC “legacy bid controls rather than average outcome-cost targets.” A target lets the system bid above your number in one auction and below it in the next.
Two things stay the same. You are not billed per conversion. OpenAI says the bidding goal and the billing event are separate settings, so a conversion campaign still charges per valid click or per 1,000 impressions, whichever you picked when you created it. And OpenAI's pricing rule applies to every strategy: “The final winning auction bid sets the price you pay.” Our conversion campaign guide covers the billing choice, which is locked at launch.
Max Bid told the system what never to exceed. Target CPA tells it what to average, so on any given day some demos will cost more than your number.
Which bidding option B2B should use now
For a B2B conversion campaign with a known cost per conversion, use Target CPA. It is the only control left on a new conversion campaign that holds a cost-per-action line you choose. Intelligent bidding (labelled Autobid in Ads Manager) still makes sense when you would rather let the budget decide, and when the event fires often enough to learn from.
The hard case is a brand-new campaign. OpenAI's guidance on setting a target starts from recent actual CPA, and a new campaign has none. You can buy a baseline with a short Intelligent bidding run on a capped daily budget, or set Target CPA at what a conversion is worth and accept that the system may not spend the whole budget while it learns. OpenAI does not say which it prefers.
The event matters as much as the strategy. A campaign optimizes toward one standard event, fixed at creation, and custom events are not supported. If the event you care about most happens three times a month, the system has little to average. Our conversion campaign setup guide ranks the B2B standard events from frequent to rare.
How to set your first Target CPA from B2B numbers
You need two numbers: what the campaign already achieves, and what a conversion is worth to you. Start the target at the first. Use the second as the ceiling. OpenAI's guidance covers the first number; the second is the part B2B teams have to bring themselves.
OpenAI's rules are short. Review the recent actual CPA “for the same conversion event,” use a consistent reporting period, allow for conversion-reporting delay, and compare it with what the outcome is worth to your business. Then the warning: “A target below recent performance may restrict delivery.” Its own example: $400 of spend and 10 purchases is a $40 actual CPA, and setting a $20 target “does not mean the system can deliver purchases at half the observed cost.”
In the example, a booked demo is worth up to $300, and the campaign is getting them for $240. So the first target is $240. If delivery is limited at that number, there is room to raise it toward $300. At $300, the company spends $4,000 on ads to win a $12,000 first-year customer, a 3x first-year return before counting renewals. Try your own numbers:
Two results deserve attention. If your actual CPA is already above what a conversion is worth, a lower target will not save the campaign: it asks the system to deliver at a cost it has never achieved. Fix the landing page, the offer or the event first. And if the period holds only a handful of conversions, treat the average as rough: the calculator shows how far a single conversion moves it.
Check your conversion signal before you switch
Target CPA learns from your conversion events, so it can only be as good as the events that arrive. OpenAI is blunt about the order of operations: “Setup alone does not establish that usable conversion signals are being received.” Weak or missing signals can reduce delivery and leave budget unspent.
- A data source is connected: the OpenAI pixel, the Conversions API or both, linked to the campaign
- Real events are arriving: not test fires, and for the exact standard event the campaign optimizes toward
- Event Quality Score warnings are resolved: missing matching information, delayed server events and repeated firing are the usual ones
- Volume is real: OpenAI notes that a high score “does not establish that there are enough signals to support scale”
Event quality refreshes daily using seven complete calendar days, so a fix takes about a week to show fully. A score that reads as unavailable because of low activity is not a score of zero. And OpenAI warns against padding: do not send extra events or change event times to lift a score. If you are not sure the pixel fires at all, start with our guide to checking that your ChatGPT Ads pixel works.
How to set Target CPA in Ads Manager, step by step
Setting the target takes a minute; the work is in the numbers you bring to it. These steps assume a pixel or Conversions API source is already sending a standard event. If not, our campaign setup guide covers that first.
- Pick the conversion event (5 minutes). Choose the one standard event the campaign will optimize toward, such as Appointment scheduled or Trial started. Custom events are not supported, and the event cannot be changed after the campaign is created.
- Pull your actual CPA for that event (10 minutes). Divide spend by conversions of the same event over a period that has finished reporting. Use the same window each time you check.
- Work out what a conversion is worth (10 minutes). Multiply the most you will spend on ads to win a customer by the share of conversions that become customers. That is your ceiling.
- Confirm conversions are arriving (10 minutes). Check that real events reach the pixel or Conversions API linked to the campaign, and resolve any Event Quality Score warnings.
- Create the campaign and enter Target CPA (10 minutes). In the ad group's Bid strategy section, choose Target CPA (listed with Autobid and Manual: Max bid in our account) and enter your actual CPA as the starting target, not a number below it.
- Review audience bid multipliers (5 minutes). Where your account offers a multiplier, it now adjusts the average target for that audience, so check each one against what that audience is worth.
- Review spend, results and average cost together (weekly). Let the campaign learn, change one thing at a time, and judge it on a full reporting period rather than a single day.
For step 6, OpenAI's example is a $50 Target CPA with a 1.2x multiplier for new customers, which gives that audience a $60 target. In our worked example, a 1.2x multiplier on the $240 starting target gives $288, still under the $300 ceiling. When we checked on November 9, the Advanced section that holds audience adjustments appeared with Manual: Max bid but not with Target CPA, so look for it before you plan around a multiplier. Multipliers need an audience of at least 25,000 matched users; our custom audiences guide covers building one.
Moving existing Max Bid campaigns before January 1
Every Max Bid and Max CPC campaign has to move by January 1, 2027. OpenAI says to begin from November 9 and to “follow the supported transition steps shown for your campaign.” This is the control that retires:
- List every campaign. Note its bid strategy, its bid value and its actual CPA or CPC over a period that has finished reporting.
- Move one campaign at a time. Start with the campaign that has the most conversions, so the result is easiest to read.
- Set the target from actual CPA, not from the old bid. See below.
- Recheck audience multipliers. Under Max Bid a multiplier raised a ceiling. Under Target CPA, where your account offers one, it raises an average.
- Check your tools before November 18. Anything that sends the old max bid fields will create Target CPA or Target CPC campaigns from that date, with the number read as an average. On November 8, OpenAI's API bidding documentation did not yet list the new fields.
Do not paste your Max Bid into the Target CPA field
A max bid and a target can share a number and mean different things. Suppose a campaign ran with a $300 max bid and achieved a $240 actual CPA. Typing $300 into Target CPA tells the system that an average of $300 is fine: up to 25% more per demo than you have been paying. Start from the $240 the campaign achieved.
A ceiling and an average with the same number are different instructions. Copying the old bid into the new field quietly raises what you are willing to pay.
Target CPC for click campaigns
Target CPC is the click-campaign version: an average cost per click rather than a maximum. It is available for new click campaigns from November 9, and Max CPC retires on January 1, 2027. OpenAI says Target CPC lets the system bid above or below your target in individual auctions.
Set it the same way: from the actual CPC of comparable campaigns over a finished period. OpenAI's ads basics page still recommends starting click campaigns at a $3 to $5 maximum bid as of November 8, a figure written for Max CPC. For what clicks have actually cost advertisers, see our ChatGPT Ads cost guide.
What OpenAI has not said yet
The change is documented in one new article, and several older ones have not caught up. Four gaps matter for planning:
- No minimum volume. OpenAI publishes no number of conversions a Target CPA campaign needs, and no learning-period length.
- No default migration. It has not said what happens on January 1 to a campaign nobody moved.
- Older articles. On November 8 the conversion campaigns article still described a Bid Cap with “no recommended bid amount at this time,” and the Maximize results article still described the old default.
- API fields. The developer documentation did not yet name the new Target CPA and Target CPC fields.
We will update this post as those gaps close. To see your ChatGPT Ads clicks beside the organic AI referrals you already get, the AI-Advisors AI Ads module splits AI traffic into paid and organic in one view. For judging the channel on pipeline rather than platform conversions, see our ROI framework for ChatGPT Ads.
Frequently Asked Questions
#What is Target CPA in ChatGPT Ads?
Target CPA is the average amount you want to pay for a conversion, such as a lead or a booked demo. ChatGPT Ads uses it as a goal: it bids more or less in individual auctions to bring the average toward your number. It is not a cap, and OpenAI says the actual average can come in higher or lower than the target.
#When does Target CPA replace Max Bid in ChatGPT Ads?
OpenAI dates it November 9, 2026 for new conversion campaigns. On the evening of November 9 our account offered Target CPA alongside Manual: Max bid, so the switch may reach accounts at different times. Existing Max Bid and Max CPC campaigns keep running until January 1, 2027, when both controls retire. OpenAI says you can start moving existing campaigns to the new options in Ads Manager from November 9. API integrations have their own dates: November 18 and December 31.
#Do I pay per conversion with Target CPA?
No. OpenAI says the bidding goal and the billing event are separate settings. A conversion campaign optimizes toward your chosen event, but you are charged per valid click or per 1,000 impressions, depending on the billing option you picked when you created the campaign. The final winning auction bid sets the price you pay.
#What should my first Target CPA be?
Your recent actual cost per conversion for the same event, measured over a period that has finished reporting. OpenAI says a target below recent performance may restrict delivery. Then check it against what a conversion is worth to you: if your actual CPA is already above that, a lower target will not fix it. The funnel or the event needs work first.
#What happens to my Max Bid campaigns on January 1, 2027?
Max Bid and Max CPC retire for existing campaigns on that date. OpenAI asks advertisers to move campaigns to Target CPA or Target CPC from November 9 and to follow the transition steps Ads Manager shows for each campaign. It has not said what happens to a campaign nobody moves, so move yours yourself and set the target from its actual CPA.
#Why is my Target CPA campaign not spending its budget?
OpenAI names three causes: a target that is too restrictive, too few eligible opportunities, or conversion signals that are weak or missing. Compare the target with the campaign's recent actual CPA first. Then confirm that real events are reaching the pixel or Conversions API linked to the campaign, and read the Event Quality Score warnings in Ads Manager.
Related Reading
- How to Set Up a ChatGPT Ads Conversion Campaign for B2B
- ChatGPT Ads Now Bids for You by Default. B2B Should Opt Out.
- How to Check Your ChatGPT Ads Pixel Is Working
- How to Set Up ChatGPT Ads Custom Audiences for B2B (Start With Exclusions)
- How Much Do ChatGPT Ads Cost? CPM Range, CPC Bids (November 2026 Update)
