OpenAI's annualized revenue run rate stood at approximately $50 billion at the end of September, according to the Financial Times — a figure that would be eye-popping for nearly any company on Earth, but one that fell short of the roughly $70 billion investors had been passing around in late September. For readers new to the term, a run rate is a projection: a company takes its recent sales and extrapolates them across a full year, so the number captures momentum rather than a completed annual total.

The shortfall did not come from customers walking away. It came from two different ways of counting the same money, and when the market expects a number beginning with a seven and receives one beginning with a five, the reaction is predictable. The distinction matters considerably for a company reportedly eyeing a public listing at a valuation of around $1.4 trillion — a stage at which how revenue is defined comes under especially close scrutiny.

Gross versus net: an accounting fork in the road

The gap reflects a split in revenue methodology. Consider a travel agent who sells a $1,000 flight and keeps a $100 commission: one way of booking that sale records $1,000 in revenue, while the other records only the $100 the agent actually keeps. That, roughly, is the accounting question at the heart of the story.

Per the report's findings, OpenAI reports revenue on a net basis — effectively counting only the slice it keeps when sales flow through partners. Investors, however, had been applying a gross methodology similar to the one used by rival Anthropic, which includes sales made through partners.

The Financial Times report landed on October 8, 2026, and it quickly reshaped how the market was reading OpenAI's momentum.

OpenAI has pushed back on any suggestion that business is slowing. The company announced 77% overall run-rate growth in the third quarter of 2026 — the three months through September — with enterprise revenue performing even better at 107% growth over the same stretch. OpenAI remains optimistic about reaching or topping roughly $70 billion in annualized revenue by year-end — this time on its own net accounting terms.

A year of steep climbs and a few stumbles

The trajectory in 2026 has been steep by any measure. OpenAI started the year with an annualized revenue run rate of approximately $20 billion, passed $40 billion by August, and reached approximately $50 billion by the end of September. Hitting at least $70 billion by December would mean more than tripling the run rate in a single calendar year.

The year has not been a straight line, though. In April 2026, OpenAI reportedly fell short of internal targets for ChatGPT user growth and some revenue benchmarks, a stretch that came as competition intensified from Google and Anthropic.

Meanwhile, OpenAI's spending ambitions remain enormous. The company has leaned into massive capital expenditures and infrastructure deals with technology giants including Microsoft and Amazon.

What it means for investors

The most immediate fallout showed up outside OpenAI. Oracle shares fell 5% on October 8 as the run-rate news circulated.

For investors, the lesson is less about whether OpenAI is growing and more about how that growth gets reported. Comparing companies that use different revenue methods is a bit like comparing a marathon time to a half-marathon time: both numbers are real, but the comparison is meaningless without context.

There is also a competitive wrinkle. If Anthropic's gross approach produces larger headline numbers, casual comparisons may flatter one company over another in the race for enterprise customers.

The enterprise figures may be the most telling detail in OpenAI's update. Growth of 107% in that segment suggests businesses are paying up for its tools — revenue that tends to be stickier than consumer subscriptions.

The key item to watch is whether OpenAI actually reaches its year-end target of at least $70 billion on a net basis. Clearing that bar would go a long way toward quieting the accounting debate; falling short would likely revive it. And given the Oracle reaction, the ripples would not stay contained to one company.

Investors should also keep an eye on how AI companies describe their revenue going forward. Until then, anyone sizing up an AI company's growth would be wise to ask a simple question first: gross or net?

Source: CryptoBriefing