OpenAI is changing how advertisers bid inside ChatGPT, and the timetable is short. From Monday, November 9, 2026, new conversion campaigns will use Target CPA instead of Max Bid, and new click campaigns will use Target CPC instead of Max CPC. The old bidding options do not vanish overnight — Max Bid and Max CPC keep working for existing campaigns until January 1, 2027 — but the direction is clear: manual ceilings are giving way to targets that let the system find the price. OpenAI emailed advertisers about the change on November 5, and told them to review their campaigns and begin moving on November 9.
The November 9 switch applies to new campaigns. A conversion campaign created from that date will bid with Target CPA, the cost per action the advertiser is willing to pay, instead of Max Bid, the ceiling on what any single bid could reach. A click campaign will bid with Target CPC, a target cost per click, instead of Max CPC, the maximum the advertiser would pay for one click. The difference is one of control: a maximum says never pay more than this, while a target says aim for this average and let the system spend around it.
Alongside the new options, OpenAI is renaming an old one. Maximize results, the autobid setting that lets the system spend a budget chasing as many results as possible, becomes "intelligent bidding". The rename is cosmetic, but it signals the same direction as the rest of the change: OpenAI wants advertisers to hand the bidding decisions to its systems and judge the outcome on results rather than on the bid itself.
Existing campaigns get a grace period, but not a long one. Max Bid and Max CPC continue to work on campaigns that already use them until January 1, 2027, when both options retire. After that date, any campaign still running on the old bidding types will need to have moved — or it will stop running as configured. That gives advertisers roughly seven weeks from the November 9 switch to migrate, test, and settle on the new targets.
There is also a technical date inside the window that developers should not miss. Legacy bid fields in the Advertiser API change meaning from November 18, which means any tooling, dashboard, or script that reads or writes those fields needs to be checked before that date. A campaign that looks fine in the interface can still break in the plumbing if an integration is passing values the API no longer interprets the same way.
OpenAI's advice in its November 5 email was straightforward: review your campaigns and begin moving on November 9. The practical version of that is to audit first. List every campaign still on Max Bid or Max CPC, note which ones drive real conversions, and decide the target you are comfortable with before the system starts deciding for you. A Target CPA set too low will starve a campaign of volume; one set too high will spend freely. Neither mistake is visible until the money has moved.
For SEOs and marketers watching ChatGPT Ads from the sidelines, the change is a reminder that the channel is maturing fast. Target-based bidding is how established ad platforms work, and its arrival inside ChatGPT suggests OpenAI is building the ads product for scale rather than for experimentation. The advertisers who learn the new bidding model now — while the old options still run — will be the ones whose campaigns are stable when January arrives. The switch is also a useful test of how much of the channel's early growth was driven by advertisers who liked the control of a hard bid ceiling — and how many are ready to trust the system instead.
Sources: Search Engine Land and Search Engine Roundtable, November 5, 2026.
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