Altman Calls Cerebras a 'Close Partner' as OpenAI's Fastest Tier Runs on Nvidia
Cerebras powered OpenAI's last speed tier in August. Its successor launched on Nvidia GPUs, 19.4 million insider shares unlocked the same week, and the bid that steadied the tape was a Sam Altman post.
Vincent Jiang · 3 min read
August's speed tier ran on Cerebras. The new one runs on Nvidia
On 13 August, Cerebras said it was powering the new Ultrafast tier for OpenAI's GPT-5.6 Sol, delivering up to 750 output tokens a second 1. Seven weeks later the successor arrived on someone else's silicon: research firm SemiAnalysis posted on Wednesday that the Ultrafast mode of GPT-6.1 Sol runs on Nvidia GPUs, and the stock fell 7 percent that day 23. Cerebras has neither confirmed nor denied any role in the new model 3.
One customer is the whole valuation
CBRS closed Friday at $166.43, down nearly 20 percent for the week and more than half from its May listing pop: just over $39 billion of market value against $95 billion on day one 27. What the bulls own is OpenAI paper. More than $20 billion of a $25.4 billion backlog, as of June, is tied to a 14 January deal for up to 750 megawatts through 2028, worth over $10 billion to start 45. That is single-customer risk, and this week the customer repriced it.
The reassurance landed with the unlock
The SemiAnalysis post was not the only supply hitting the market that day. The same Wednesday, 19.4 million insider shares, about 8 percent of those outstanding, came out of lockup, and up to 14.6 million more have freed up every two weeks since 19 August 2. Sam Altman answered on X: "Cerebras is a close partner, and we have a deep engagement pushing on the frontiers of speed." The stock rose almost 3 percent after hours 2. Altman has personally held about 89,373 Cerebras shares since February 2017 5.
19.4 million shares unlocked the day of the 7 percent drop; another 14.6 million are due October 14
- Shares unlocked
- Estimate
Data
| Shares unlocked | |
|---|---|
| 19 Aug | 14.6M |
| 2 Sep | 14.6M |
| 16 Sep | 14.6M |
| 30 Sep | 19.4M |
| 14 Oct (estimate) | 14.6M |
A $25.4 billion promise against $180 million a quarter
Second-quarter revenue was $180 million, up 74 percent from a year earlier 6. The backlog is roughly 140 times one quarter's sales, and converting it depends on megawatts built, powered and switched on.
Revenue has doubled in a year and still rounds to $180 million a quarter
Data
| Revenue | |
|---|---|
| Q1 '25 | $0.1B |
| Q2 '25 | $0.1B |
| Q3 '25 | — |
| Q4 '25 | — |
| Q1 '26 | $0.19B |
| Q2 '26 | $0.18B |
The contract is still signed
Nothing in the record shows OpenAI retreating: the commitment is multi-year, phased through 2028, and one launch choice does not rewrite it 5. The technical read is harder. SemiAnalysis says the Nvidia deployment runs at low batch size, the low-latency regime Cerebras's dinner-plate chips were designed to own 3. If general-purpose GPUs now serve frontier models at that latency, the case for dedicated silicon narrows to price.
Watch the next tranche, not the next post
Three dated tells: whether Cerebras appears in GPT-6.1 Sol Ultrafast as capacity grows, which nobody has promised 3; the next 14.6 million-share tranche 2; and OpenAI's own August language, "we will use these findings to guide deployment as capacity grows" 1. A "close partner" post is not a purchase order, and it arrived the same week 19.4 million unlocked shares needed one.
More about NVIDIA
NVDA · Fiscal Q2 2027Revenue rose 106% to $96.2B, 92.5% of it from Data Center, “driven by the ramp of our Blackwell Ultra infrastructure”. Gains on equity stakes of $7.8B lifted net income to $59.7B.
Show as a table
| Line | Value |
|---|---|
| Revenue | $96.2B |
| Gross margin | 75.0% |
| Operating margin | 66.2% |
| Net income | $59.7B |
| Hyperscale | $48.7B |
| AI clouds & enterprise | $40.3B |
| Data Center | $89.0B |
| Edge Computing | $7.2B |
| Gross profit | $72.1B |
| Cost of revenue | $24.1B |
| Other income | $7.8B |
| Operating income | $63.7B |
| Operating expenses | $8.4B |
| Tax | $11.8B |
| R&D | $7.1B |
| SG&A | $1.4B |
Deepdive
AI-generated from this story and its cited sources. Not investment advice.
