The APAC CMO's Guide to ChatGPT Ads: Japan Is Just the Beginning

Japan will soon become one of the APAC markets to watch in AI-led media.

OpenAI is expanding its ChatGPT ads pilot to Japan, with Dentsu Digital announcing that it has begun pilot operations as a domestic launch partner for the Japan rollout.

For CMOs in APAC, this is a unique opportunity to test and learn quickly. Early signs indicate that this is developing into an important channel and an alternative advertising avenue for brands, beyond search results, social feeds, and retail media platforms, into AI-assisted conversations. How much of this shift of ad dollars we will see should be rightly based on incrementality measurements and standard MMM testing. I suspect there will be a surge of ROI for early adopters, and just like any other advertising channel, it will mature and find its rightful place in the media mix.

But one thing is for sure: it changes the marketing thinking from “How do we reach the customer?” to “How do we show up when the customer asks for help?”

Announcement as part of the new momentum

ChatGPT ads in Japan are not happening in isolation. Google is already moving ads into AI-assisted search experiences, including across APAC markets. Baidu has been pushing generative AI deeper into search and its broader commercial ecosystem in China. So the direction is becoming clearer: AI answer surfaces will become commercial surfaces.

For now, AI-sponsored answers feel different as an Ad medium from search Ads for obvious reasons. This is bringing the consumer closer to the pure assistant experience, which means closer to the purchase decision. The user is not just typing keywords into a search box. They are asking a question, seeking guidance, comparing options, or trying to make a decision. At the surface, it does look like it covers more ground in decision-making or the purchase journey than before. That makes the opportunity powerful. But there are still some unknowns, like the impact on consumer trust and brand safety. Not things we can take lightly. But innovation and experimentation will give us some early indications of trust signals and brand safety risks.

Why Japan Matters for APAC Marketers

Japan is a strong test market for this shift. It is commercially mature, digitally sophisticated, and highly brand-conscious, yet in many respects still a place where traditional and new forms of advertising coexist and work simultaneously. Consumers expect relevance, quality, and credibility. Agencies are experienced and measured, and Governance expectations are taken seriously.

For APAC CMOs already investing in Japan, this creates a practical learning opportunity. Not recommending a complete reallocation and chasing the hype. But a reason to experiment early, carefully, and with a clear test design.

Brands that learn now will gain a competitive advantage when conversational advertising becomes more widely available across the region.

The Opportunity for CMOs

Most digital advertising has been built around three behaviours. People search, People scroll, People shop. Conversational AI adds a fourth behaviour. People ask.

That one change matters. When users ask an AI assistant for help, they are often closer to their intent than in a normal display or social environment.

They may be asking, “Which running shoes are best for marathon training?” Or what software should I consider for my sales team? Where should I stay in Tokyo for business trips or family? What are the best options for a mid-market CRM? How do I choose between two financial products?

These are definitely getting closer to decision moments, and for marketers, this opens a new kind of paid presence.

The strategy moves beyond “Which audience should we target?” to “Which questions should our brand be eligible to appear beside?”

A bit like how the search practice developed, instead of which keywords to have a better ‘Share of Voice’, which questions or phrases should we show up on?

How Brands Can Participate

For now, CMOs should treat this as an early, partner-led opportunity rather than a fully open self-serve media product. OpenAI has announced an ad pilot in Japan, with Dentsu Digital named the domestic launch partner.

If your brand is already buying media in Japan, the starting point should be your local media agency, regional agency network, or any authorised partner involved in the OpenAI ads pilot.

In practice, your existing media partners may be able to explore the opportunity on your behalf, especially if they already work with the relevant agency networks or platform partners in Japan.

The criteria, category restrictions, commercial terms, minimum spend levels, and thresholds for participating brands do not appear to be publicly defined for Japan at this stage. So the practical next step is to ask your media agency partners what is currently possible, who is eligible, and what controls are available.

The first discussion should cover five areas.

1. Eligibility: Which brands, sectors, and use cases are currently allowed into the pilot?

2. Format: Where does the sponsored placement appear inside the chat experience, and how is it labelled?

3. Targeting: Is targeting based on user interest, conversational context, category relevance, or campaign inputs?

4. Controls: What exclusions, brand safety rules, sensitive category protections, and governance checks are available?

5. Reporting: What will be measured, and how will performance be separated from organic AI responses?

This should not be treated like a normal display buy. It should be treated like a controlled learning experiment.

A Smart Pilot Design

A good first test for a brand should be narrow. Choose one category/ product or service. Then define one consumer or client need and one campaign objective. Of course, the market is already, by default, Japan.

Avoid sensitive or high-risk categories/ product or services in the first test. Do not start with anything that could make the user feel vulnerable, such as serious health issues, financial distress, crisis or people’s safety.

OpenAI has said its ads pilot applies to logged-in adult users on the Free and Go tiers, while the Plus, Pro, Business, Enterprise, and Education tiers remain ad-free. It has also said ads are not eligible around sensitive or regulated topics such as health, mental health, or politics.

And I believe that is the right starting point. Brands should also apply their own stricter judgment. Start with a use case where commercial assistance can genuinely help.

Examples could be Travel planning, Consumer electronics comparison, Retail product discovery, Education programme exploration, B2B software research, Automotive consideration or Lifestyle services.

The creative should be useful, not pushy, and the landing page should answer the question the user was likely asking. The call to action should support discovery rather than force conversion too early.

This is not the place for inflated claims or aggressive performance marketing language. In conversational AI, relevance and restraint will matter.

What CMOs Should Deliberate Before Approving Budget

This is where the CMO needs to slow the organisation down just enough to make the experiment safe.

The first issue is disclosure. The user must immediately know what is sponsored and what is organic.

The second issue is influence. OpenAI has said ads are clearly labelled, visually separated from organic answers, and do not influence ChatGPT’s responses. That distinction matters. CMOs should still ask every pilot partner to show exactly how this works in the user experience.

The third issue is context. Not every question is an appropriate moment for advertising. Some conversations may be too sensitive for commercial intervention.

The fourth issue is measurement. Clicks alone will not be enough. CMOs should look at qualified engagement, assisted consideration, traffic quality, brand lift, conversion quality, and user sentiment.

The fifth issue is governance. Legal, brand, media, data privacy, and customer experience teams should be aligned before the test goes live. This does not need to become bureaucratic. But it does need to be intentional.

What To Ask Your Agency

• Before committing to a budget, I would ask the agency a simple set of questions.

• Can you show us exactly how the placement appears to the user?

• Is the sponsored label always visible?

• Does the ad influence the answer, or sit separately from it?

• What user signals are being used for targeting?

• Can we exclude sensitive prompts or categories?

• What categories are not allowed?

• What reporting will we receive?

• How will this be compared against paid search, AI Overviews, social, and retail media?

• What happens if a user complains that the placement feels intrusive?

• Can we run this as a limited test with clear learning objectives?

If the answers are vague, do not scale. If the answers are clear, it may be worth testing.

The Bigger Marketing Shift

I see this as part of a wider move toward Generative Engine Monetisation. The first wave of AI marketing was about visibility. How do brands appear in AI-generated answers? The next wave is about monetisation. How do brands buy presence inside AI-mediated discovery and decision-making?

Early signs indicate that this is developing into an important channel and an alternative advertising avenue for brands, beyond search results, social feeds, and retail media platforms, into AI-assisted conversations. How much of this shift in ad dollars is visible? Clearly, brand trust and brand safety are two levers that need to be constantly monitored, especially in the initial experimentation phase.

It will also change the Human Agent Ratio of marketing. How much of the customer journey is shaped by the human brand team? How much is mediated by the AI assistant? How much is influenced by paid placement?

And how much trust still needs to be earned directly by the brand?

CMOs cannot outsource these questions entirely to media teams or platforms.

They sit at the intersection of growth, customer experience, governance, and trust.

My View

APAC CMOs should not overreact and over-index on Generative AI ads, irrespective of the platform. The ChatGPT or Google AI discovery category ads will be a great opportunity to jump in and see how they perform against other media investments. But these should not be just vanity metrics, it has to be rooted in measuring trust and done in a brand safe enviornment.

The next media surface may not be a page, feed, or search result. It may be the conversation. And when the media surface is a conversation, trust becomes the real performance metric.

As you know, my underlying principle of everything done with AI is Human Strategy, Augmented by AI.