OpenAI told investors on Oct. 8 that its annualized revenue run rate was nearing $50 billion at the end of September12.
That number sat $20 billion below a figure investors had circulated for weeks13.
Nasdaq Composite shares fell 1.25 percent that day, to about 27,1931. Chip stocks fell harder still3.
Contracts stayed in place. Customers kept paying. The missing money came from a counting choice OpenAI's own investors made12.
The real question turns on which accounting method investors used to measure OpenAI's growth.
Why the Same Sale Counts Two Different Ways
Anthropic counts the whole sale7. A customer may pay through a cloud partner such as Amazon Web Services or Google Cloud, and Anthropic still books the full price. OpenAI counts only its own cut of that sale.
Francine McKenna, an accounting professor, says the test is "who is the principal and who is the agent" in a sale6. Anthropic treats itself as the principal in each transaction, so it books the gross amount. OpenAI treats itself as the agent in deals that run through a partner, so it books the smaller, net figure7.
Apply each lab's own test to its own sales, and the two run rates climb at very different speeds7. OpenAI's own run rate grew from $13 billion in August 2025 to more than $40 billion a year later. Anthropic's run rate grew from $1 billion in 2025 to $65 billion by the end of July 2026.
OpenAI's Run Rate Drops $20 Billion When Its Own Accounting Replaces Anthropic's
OpenAI's annualized revenue run rate, end of September 2026, by counting method
The blue dot is the net figure OpenAI reported; the magenta dot is the gross figure investors built by applying Anthropic's method; the rod is the gap between them.
OpenAI's own disclosure stopped short of the $70 billion figure; investors built it by applying Anthropic's accounting method to OpenAI's sales.
Sources: Euronews [1]; TechCrunch [2]; Epoch AI [7]. Chart by Ryan Elliott Dennis.
The numbers behind this chart
| Item | OpenAI's net figure | Investors' gross estimate |
|---|---|---|
| OpenAI, Sept. 2026 | $50B | $70B |
Investors wanted one number to compare the two labs. They took Anthropic's method and applied it to OpenAI's sales, and the total came to nearly $70 billion12. OpenAI's own disclosure stopped short of that total.
Wall Street Sold First and Asked Later
Chip and cloud stocks absorbed the worst of the Oct. 8 drop3. Nvidia fell 2.94 percent to $230.48, erasing about $169 billion in market value.
Smaller suppliers fell even harder than Nvidia did3. CoreWeave, the cloud firm most dependent on OpenAI's spending, dropped hardest of all.
CoreWeave Fell Hardest, Down 7.77 Percent, in the Oct. 8 OpenAI Revenue Scare
Share price change, Oct. 8, 2026, for companies tied to OpenAI's AI spending
Each bar is one stock's percent change on Oct. 8; the magenta bar is CoreWeave, the stock that fell hardest.
Source: 24/7 Wall St [3]. Chart by Ryan Elliott Dennis.
The numbers behind this chart
| Item | Value |
|---|---|
| CoreWeave | −7.77% |
| Oracle | −5.48% |
| Broadcom | −4.35% |
| AMD | −3.90% |
| Nvidia | −2.94% |
The broader S&P 500 barely moved that day3. A calm index beside a battered chip sector shows how much of the selling aimed straight at companies tied to OpenAI's spending.
CoreWeave's exposure runs deep. The company carries a large backlog funded largely with debt, and its interest bill is already climbing3.
Oracle carries a similar risk. It holds a large stack of revenue under contract that it has yet to recognize3.
SoftBank Owns the Other Side of the Bet
About 13 percent of OpenAI sits with SoftBank Group1. Its Tokyo shares fell sharply on Friday before paring losses.
Matt Maley of Miller Tabak said investors were already nervous before the OpenAI report5. "Investors are becoming a bit skeptical about how long this huge AI spending can last with borrowing costs rising in a significant way," he said.
The Case for Arithmetic, and the Case Against Trusting It
Ulrike Hoffmann-Burchardi leads UBS's Americas investment office5. She stayed bullish after the drop. "We retain strong conviction in the AI growth story, and believe AI-related investment remains a powerful tailwind for the broader equity market," she said.
OpenAI's enterprise sales, the piece of its business furthest from the accounting dispute, still grew 107 percent8.
Francine McKenna's own work points the other way6. "Two companies with the same business model can absolutely reach different conclusions," she said. Both OpenAI's $50 billion figure and the $70 billion estimate stayed outside any audited filing34.
OpenAI stays private and skips public financial statements3. Anthropic plans to open its books only when an S-1 forces the issue4.
That filing is coming fast. OpenAI is racing to raise $30 billion before Anthropic's planned listing in mid-November4. The round could value OpenAI above $1.4 trillion, up from $852 billion in March. Once Anthropic trades in public markets, its price becomes the benchmark every private AI valuation gets measured against, 24/7 Wall St reported.
Edward Best, a lawyer at Willkie Farr & Gallagher, sits outside both deals4. "It's really a two-horse race in terms of being public," he said.
What to Do
- Ask your AI vendor which method it books. A growth claim that runs through a cloud partner can be gross or net67. Ask which one it means before you compare it with a rival's.
- Wait for the S-1 instead of the headline. Anthropic's filing, expected around its mid-November listing, will carry audited numbers for the first time from either lab4.
- Track the stocks tied to OpenAI's spending more than OpenAI itself. CoreWeave and Oracle carry backlogs that assume OpenAI keeps paying, and their earnings calls say more than any run-rate headline3.
By the Numbers
- Gap: OpenAI's run rate reached near $50 billion at the end of September12. That trailed the circulating estimate by $20 billion3.
- Method: Anthropic books the full price of a cloud-partner sale; OpenAI books only its own cut7.
- OpenAI's climb: Its run rate rose from $13 billion in August 2025 to more than $40 billion a year later7.
- Anthropic's climb: Its run rate reached $65 billion by the end of July 2026, after starting 2025 near $1 billion7.
- Market hit: Nvidia erased about $169 billion in market value on Oct. 8, falling 2.94 percent3.
- Steepest fall: CoreWeave dropped 7.77 percent the same day, against a 0.47 percent dip for the S&P 5003.
- Other suppliers: Oracle fell 5.48 percent, Broadcom fell 4.35 percent and AMD fell 3.90 percent the same day3.
- Debt load: CoreWeave's backlog of $104 billion is funded largely with debt3. Its interest expense reached $640 million in the second quarter.
- Exposure: SoftBank Group, which owns about 13 percent of OpenAI, saw its Tokyo shares fall as much as 7.3 percent1.
- Race: OpenAI is seeking $30 billion at a valuation above $1.4 trillion before Anthropic's planned November listing4.
What to Watch
Anthropic's S-1, expected around its mid-November listing, will carry audited numbers for the first time4. Watch whether OpenAI closes its new round before that filing lands. A side-by-side of two audited statements will settle more than any run-rate headline can6.
Sources
- Quirino Mealha, "What happened to OpenAI's $20bn revenue scare that rattled the AI trade?," Euronews, Oct. 9, 2026, https://euronews.com/2026/10/09/what-happened-to-openais-20bn-revenue-scare-rattles-ai-trade
- Lucas Ropek, "OpenAI's revenue is reportedly $20 billion less than previously projected," TechCrunch, Oct. 8, 2026, https://techcrunch.com/2026/10/08/openais-revenue-is-reportedly-20-billion-less-than-previously-projected/
- Omor Ibne Ehsan, "OpenAI's Revenue Is Reportedly $20 Billion Lower Than Thought. Nvidia Just Lost $170 Billion," 24/7 Wall St, Oct. 9, 2026, https://247wallst.com/investing/2026/10/09/openais-revenue-is-reportedly-20-billion-lower-than-thought-nvidia-just-lost-170-billion/
- Omor Ibne Ehsan, "OpenAI Is Racing to Raise $30 Billion Before Anthropic Goes Public," 24/7 Wall St, Oct. 20, 2026, https://247wallst.com/investing/2026/10/20/openai-is-racing-to-raise-30-billion-before-anthropic-goes-public
- Bloomberg, "S&P 500 Falls as Reports on OpenAI Sink Chipmakers: Markets Wrap," Swissinfo, Oct. 8, 2026, https://www.swissinfo.ch/eng/stocks-fall-as-reports-on-openai-sink-chipmakers%3a-markets-wrap/92183542
- Nashnova Research, "Anthropic vs. OpenAI Revenue Gap: Differences in Accounting Methods Are Key," Nashnova, Sept. 3, 2026, https://www.nashnova.com/feed/special/anthropic-vs-openai-revenue-gap-differences-in-accounting-methods-are-key-11427
- Josh You and Lynette Bye, "An update on AI's most important number," Epoch AI, Aug. 27, 2026, https://epoch.ai/gradient-updates/an-update-on-ais-most-important-number
- Diego Almada Lopez, "Nvidia and AMD shares fall as OpenAI revenue report rattles AI investors," CryptoBriefing, Oct. 12, 2026, https://cryptobriefing.com/nvidia-amd-shares-fall-openai-revenue/