ChatGPT’s ad test is really a test of trust

Less than two years ago, Sam Altman described advertising as a “last resort” for OpenAI’s ChatGPT, during a Harvard Business School interview. He said he would pursue it if it were the only way to provide global access to high-quality AI services. At the time, the comment stood out—not because ads seemed unlikely, but because it underscored what was at stake. ChatGPT doesn’t win attention the way social platforms do. It wins trust. That’s why ChatGPT’s recent ad launch matters far beyond just the creation of a new advertising surface. It’s a real-time test of whether a product built almost entirely on trust can monetize without fundamentally changing user behavior. OpenAI rival Anthropic signaled skepticism in a Super Bowl ad that humorously questioned whether introducing ads risks eroding user trust. From a business perspective, OpenAI’s move is understandable, not because leadership abandoned its principles, but because scale forces a choice. ChatGPT now serves hundreds of millions o