OpenAI has started a test phase for advertising inside ChatGPT, marking the company's first concrete move toward putting ads into a product that has so far run ad-free.

The development, reported by CampaignUs, signals a shift for a company that built its consumer business on subscriptions and API access. Until now, ChatGPT users have seen no sponsored content in the chat interface. That changes with this test phase.

What do we know so far?

The confirmed facts are limited but clear:

• OpenAI has kicked off a test phase for advertising within ChatGPT.
• The tests follow months of industry speculation about when, not whether, OpenAI would introduce ads.
• The company has not yet disclosed full details on ad formats, pricing, or rollout scope.

"OpenAI kicks off test phase for ChatGPT ads" is the entirety of the confirmed headline. Mart Signal will update this story as specifics on formats, markets, and pricing emerge.

Why is this significant?

ChatGPT is one of the most heavily used consumer AI products on the market. Any advertising placed inside the chat interface puts OpenAI in direct competition with Google and Meta for marketing budgets — and gives advertisers a wholly new surface to reach users.

For operators and media buyers, the key questions are practical ones:

• Where do ads appear? In chat responses, alongside them, or elsewhere in the interface.
• How are they priced? Auction-based, fixed CPM, or performance-linked.
• Who gets access? A handful of test partners or a broader advertiser program.
• How does OpenAI handle disclosure? Labeling of sponsored content inside conversational answers will face scrutiny from regulators already watching AI platforms closely.

None of those details are confirmed yet. What is confirmed is that the test phase has begun.

What could this mean for the ad market?

An ad-supported ChatGPT would open inventory on a surface that behaves differently from search or social. Users come to a chatbot with questions and tasks, not to scroll a feed. That changes how advertisers would need to write, target, and measure campaigns.

It also changes the economics for OpenAI itself. The company has reportedly faced steep compute costs, and advertising would add a revenue line alongside its subscription tiers and enterprise API business. Rival AI assistant makers are watching closely; a working ad model in ChatGPT would likely be copied across the category quickly.

What are the risks?

Skepticism is warranted. Advertising inside AI answers raises immediate questions about answer integrity: if a response can carry a paid message, users may trust the unpaid parts less. Regulators in the US and EU have already trained their attention on AI disclosure practices, and native ads woven into conversational text would be a prime target.

Advertisers, for their part, will want measurement standards before shifting real budgets. Early tests rarely come with mature tooling.

What happens next?

Watch for three things:

• An announcement of test partners or an early-access advertiser program.
• Details on formats — sponsored answers, product placements, or display units.
• Pricing and measurement frameworks, which will determine whether media buyers treat this as experimental pocket money or a serious channel.

For now, the fact stands: OpenAI has started testing ads in ChatGPT. The details — formats, pricing, markets — remain unannounced. Mart Signal will track the rollout as it develops.