OpenAI Just Turned 200 Million Free Users Into an Ad Audience. Here Is What Marketers Need to Know.

OpenAI flipped the switch on April 30. Marketing cookies are now active by default for every free ChatGPT user. Cookie IDs and email addresses flow to advertising partners across platforms including Instagram and third-party display networks. No opt-in required.

The scale is not subtle. Roughly 200 million people use free ChatGPT every week. All of them are now trackable unless they manually navigate to Settings, find Data Controls and toggle off Marketing Privacy. Most will not.

That targeting model is more contextual than most social platforms offer. It is closer to search intent than feed behaviour, which makes it valuable for performance marketers chasing high-intent audiences.

OpenAI says it is not sharing conversations with advertisers. The distinction matters. They share behavioural signals derived from conversations, not the transcripts themselves. For privacy-conscious brands, that line will need careful scrutiny before budget allocation.

Paid subscribers on Plus and Enterprise plans remain exempt from tracking. That creates an unusual dynamic where the free product subsidises OpenAI's AI development through both compute usage data and advertising revenue.

The timing aligns with OpenAI's broader commercialisation push. The company recently began testing display ads inside ChatGPT conversations. Combined with cookie-based retargeting across external platforms, OpenAI is building a full-funnel advertising ecosystem inside what most users still think of as a productivity tool.

For Australian marketers, the channel is nascent but worth watching. ChatGPT's Australian user base skews toward professionals, knowledge workers and small business owners. That is a high-value demographic that overlaps heavily with the audiences most brands are already paying to reach on Google and Meta.

This is not a minor product update. OpenAI is building an advertising business on top of the most widely used AI tool in the world. The contextual targeting model, built on conversation topics rather than browsing history, could prove more effective than traditional display for consideration-stage campaigns.

The default opt-in approach will draw regulatory attention, particularly in markets with strong privacy frameworks. Australian marketers should monitor OAIC guidance before committing significant spend.

The AI search advertising market just got its biggest inventory injection since Google launched AI Overviews. Whether it converts remains to be seen, but the audience is already there.