October 11, 2026 — Sam Altman’s OpenAI is learning that in the age of the AI boom, even a private company’s bookkeeping can move public markets. A $20 billion gap between two reported revenue figures sent technology stocks tumbling this week — and put the world’s most-watched startup under an uncomfortable spotlight.
The turmoil began with a financial-press report that OpenAI’s annualised revenue stood at about $50 billion at the end of September, far below the roughly $70 billion figure investors had been using since late September. Chip stocks cratered: the semiconductor index shed 3.4 per cent, with Nvidia, Broadcom, Micron and Intel all sliding.
Hours later came the counter-narrative. A second report said OpenAI still expects its annualised revenue to reach or exceed $70 billion by the end of December, powered by enterprise growth. Much of the gap, analysts explained, comes down to accounting: rival Anthropic counts sales made through cloud partners in its revenue figures, while OpenAI’s number reflects net revenue only.
The stakes could hardly be higher. OpenAI is reportedly negotiating a funding round of $30 billion or more at a valuation around $1.4 trillion, even as its stock-market debut slips to next year — a delay Altman has attributed to wanting to get the company’s footing right before facing public-market pressure.
For investors, the episode was a lesson in the limits of annualised revenue — a pace, not a promise. Getting from $50 billion to $70 billion by December requires roughly 40 per cent growth in the run rate. The market will now be watching every data point for proof.
The episode has also sharpened scrutiny of how AI companies report their numbers. Anthropic’s much-cited $65 billion run rate, for instance, counts cloud partners’ sales — an accounting choice OpenAI does not make. As both companies race toward public listings, analysts say investors should treat every headline figure as the start of a question, not the end of one.
