ChatGPT Ads swaps Max Bid for Target CPA from 9 November

If you run ChatGPT Ads campaigns with a bid ceiling, the ceiling is going. OpenAI's Help Center guidance says that from Monday 9 November 2026, Target CPA replaces Max Bid for new conversion campaigns and Target CPC is available for new click campaigns. Max Bid and Max CPC retire for existing campaigns on 1 January 2027. The replacements are average-cost goals, and delivery leans on the quality of your conversion data.

What changed

Starting Monday 9 November 2026

• Target CPA replaces Max Bid for advertisers creating new conversion campaigns who want a specific cost per conversion. OpenAI describes it as the average amount you would like to pay for a conversion, such as a purchase or lead.
• Target CPC is available for new click campaigns. OpenAI says the system can bid above or below your target in individual auctions.
• OpenAI tells advertisers to begin moving existing campaigns in Ads Manager from 9 November 2026.

Intelligent bidding, formerly Maximize Results (Autobid), stays as the option for pursuing results within your budget without a target. The sources describe no change to it.

Retiring on 1 January 2027

Max Bid and Max CPC retire for existing campaigns. OpenAI calls them legacy bid controls: Max Bid sets an auction-bid ceiling and Max CPC sets a maximum click bid.

API partners

OpenAI says it is adding dedicated Target CPA and Target CPC fields, so partners can create campaigns with target bidding or switch existing campaigns to it. The timeline it gives:

• Before 18 November 2026: the Max Bid and Max CPC fields keep their existing behaviour, and partners can adopt the new fields once they are available.
• From 18 November: OpenAI recommends the new fields. The legacy fields stay supported through 31 December, but using them to create a campaign or change an existing ad group's bid type selects Target CPA or Target CPC, and submitted values represent average-cost targets, not maximum bids.
• From 1 January 2027: the legacy fields are deprecated, and partners should update integrations before then.

How pricing works

OpenAI says auctions determine which eligible ads are shown and the final winning auction bid sets the price you pay, across all bidding strategies, including existing Max Bid and Max CPC campaigns. A Target CPA or Target CPC is, in OpenAI's words, an average-cost goal and "not a fixed price per conversion or click". Its example: a $50 Target CPA means some conversions cost more and others less. OpenAI also says bidding goal and billing event are separate settings, so a campaign can optimise for conversions while being charged on clicks or impressions.

What this means for specialists

A Max Bid campaign had a hard ceiling on individual auction bids. A target does not: OpenAI says the system manages individual bids and may bid above or below the target. A campaign that relied on the ceiling for cost control will need watching against actual average cost. That is an implication of how OpenAI describes the two controls, not something it states in those words.

Start from recent actual CPA for the same conversion event, or actual CPC for a click campaign, over a consistent period that allows for conversion-reporting delay. OpenAI's example: $400 in spend and 10 attributed purchases gives an actual CPA of $40, and a $20 target does not mean the system can deliver purchases at half that cost. It warns that a target below recent performance may restrict delivery.

Then there is the data. OpenAI says weak or missing conversion signals can reduce delivery and leave budget unspent, and that "Setup alone does not establish that usable conversion signals are being received." Event Quality Score (EQS) describes how useful received event information is for measurement, but OpenAI says a high score does not establish that there are enough signals to support scale.

One constraint comes from the Conversion-optimized Campaigns article: the objective and billing option cannot be changed in place after creation, and nor can the conversion event. Moving from click billing to impression billing means cloning the campaign and selecting Impressions; for other changes, and for a different event, create a new campaign. Whether a Max Bid campaign moves to Target CPA in place or by rebuild in Ads Manager is not spelled out beyond OpenAI's instruction to follow the supported transition steps shown for your campaign. For API partners, the documented operation from 18 November is the legacy-field behaviour described above.