New ad groups now bid on their own, and advanced matching turned on for existing pixels from 17 August. A five-minute check is worth your time.
What flipped on, and when
If you run ads inside ChatGPT, two defaults changed in the update wave that landed the week beginning Monday 17 August 2026. The help-centre documentation was refreshed around 12 August, and an advertiser product-update email followed, listing six changes in all. Two of them are the ones to know about, both reported by PPC Land from OpenAI's own advertiser communications.
First, "Maximize results" automated bidding is now the default for eligible new ad groups. The strategy sets and moves your bids toward the campaign goal, clicks or conversions, to win as much volume as your budget allows. There is no guaranteed cost-per-action, cost-per-click, or return-on-ad-spend target attached to it. A recommended starting cap of roughly $3 to $5 per click gives it a sensible ceiling.
Second, and more consequential, automatic advanced matching became the default on existing web pixels from 17 August, at the close of a ten-day opt-out window. Advanced matching takes hashed customer details captured from your website forms and uses them to attribute more conversions. Advertisers who wanted it off had until 17 August to switch it, under Tools, then Conversions, then Data Source, then Edit pixel. The change was reported across nine markets, with a clear opt-out clock, including users in Mexico, Brazil and Europe.
One caveat on sourcing. OpenAI's ChatGPT Ads help centre and its advertiser email sit behind a login, so there is no public page to point to. The facts here rest on two independent trade reports of OpenAI's own comms, which is why we treat the two defaults as confirmed and leave the rest of that six-item email aside.
Why the matching default is the part to check
Automated bidding is a spend-efficiency setting. If your account is new or you are building fresh ad groups, the platform now steers the bids by default, so it pays to set that per-click ceiling and watch early results rather than leave it fully open.
The advanced-matching default is a data question, and that is the one compliance-aware firms will want to look at. It sends hashed customer information collected from your forms to the platform, on by default, unless someone opted out inside the window. For an accounting, legal or advisory practice in Australia or the UK, that touches how client data leaves your site and who processes it, which is worth a conscious decision rather than a default someone never saw. This is not a reason to panic. It is a reason to open the pixel settings, confirm whether matching is on, and make sure the answer matches what your privacy commitments allow.
If you did not opt out before 17 August, matching is now live on your existing pixels. You can still review and change it in the same place, and you can bring your data handling in line from there.
Frequently asked questions
Do I need to do anything right now?
Two quick checks. Open your ChatGPT Ads pixel settings to see whether advanced matching is on, and decide whether that fits your privacy commitments. If you are launching new ad groups, set a per-click cap of around $3 to $5 so automated bidding has a ceiling.
What is advanced matching, and is my customer data now being shared?
Advanced matching uses hashed details captured from your website forms to attribute more conversions. As of 17 August it defaults to on for existing pixels, so unless it was switched off in the opt-out window, that data is being sent to the platform. You can review it under Tools, Conversions, Data Source, Edit pixel.
The opt-out deadline was 17 August. Did I miss my chance?
The ten-day window to pre-empt the default has closed, so matching is now live if you did nothing. You have not lost control, though. You can still turn it off in the pixel settings whenever you choose.
Will automated bidding spend more than I want?
"Maximize results" chases volume within your budget and carries no guaranteed cost target, so results can vary. A starting cap near $3 to $5 per click keeps it bounded, and watching the first days of performance lets you adjust before it settles.
Does this affect advertisers in Australia and the UK?
The rollout was reported across nine markets and the matching default applied to existing pixels generally, so treat both changes as live for your account and check the settings directly. The data-handling angle is the one most relevant to AU and UK privacy obligations.
