Despite CEO Sam Altman previously calling an ad-based model a "last resort," OpenAI is launching ads in ChatGPT. The company justifies this by framing it as a necessity to fund free access for all users, addressing immense operational costs and signaling a strategic move toward a sustainable, IPO-ready business model.

The potential for OpenAI's advertising business is staggering. A back-of-the-envelope calculation suggests that at their scale, monetizing just 0.22 ads per prompt (one in five) at a plausible $50 CPM for high-intent discovery would generate $25 billion in revenue, rivaling established ad giants.

Traditional direct-sold ad businesses require huge support teams for creative and accounting. Programmatic-focused companies scale faster by plugging into existing platforms (SSPs) that handle these functions, allowing a single salesperson to manage large deals without a large support staff.

A contrarian view suggests Google's core search ad product has degraded for a decade, relying on its monopoly. In contrast, talent from more innovative ad platforms like Meta, now at OpenAI, could enable OpenAI to be more agile in creating a new, more compelling advertising model for the LLM era.

In the race to monetize AI chat, Google's advantage isn't just its AI. It's the pre-existing, global advertising platform. While OpenAI has to build an ad business from zero, Google can instantly activate its massive network of advertisers and infrastructure within Gemini, making its path to revenue far faster and easier.

OpenAI is testing ads on ChatGPT's free tier, mirroring the early monetization paths of Google and Facebook. This move signals the inevitable rise of generative AI platforms as a major advertising channel that marketers will need to understand and master.

The complex ad tech landscape can be boiled down to three viable business models. A company must either 1) own a first-party surface with coveted users (Google), 2) become the best at delivering a specific, measurable result (Applovin), or 3) be the exclusive demand aggregator for large advertisers (The Trade Desk).

As competitors like Google's Gemini close the quality gap with ChatGPT, OpenAI loses its unique product advantage. This commoditization will force them to adopt advertising sooner than planned to sustain their massive operational costs and offer a competitive free product, despite claims of pausing such efforts.

OpenAI's initial ad offering is intentionally basic (CPM-based, low targeting) to gather data and advertiser feedback. This MVP approach is necessary to build the foundation for a more sophisticated, conversion-optimized platform like Meta's, even if it seems underdeveloped at first.