OpenAI: Regaining the Lead in the AI Platform War

In June 2026, days after OpenAI confirmed a confidential S-1 filing at a reported $852 billion valuation, CEO Sam Altman confronts a defining question: What kind of business will OpenAI become? ChatGPT has more than 900 million weekly users, yet fewer than 6% pay for the service; quarterly losses approach $11.5 billion; and capital efficiency trails competitors. Rival Anthropic had filed its own S-1 a week earlier at a reported $965 billion valuation, while Google could distribute Gemini through Search, Android, and an Apple-Siri agreement expected to reach two billion devices. Beyond this rivalry lies a broader question: Is frontier AI a viable business? The case frames OpenAI's decision as a revenue-stream and portfolio-optimization problem. Students evaluate five opportunities - consumer subscriptions, advertising, enterprise seats and API access, in-chat apps, and agentic commerce - based on size, profitability, OpenAI's right to win, time to scale, and risk. Exhibits comparing frontier economics and token pricing support a broader viability debate as Altman prepares the prospectus roughly 120 days before a possible roadshow.