Cerebras Stock Rises After Sam Altman Reaffirms Partnership
Cerebras stock rose in premarket trading after OpenAI CEO Sam Altman called the company a close partner, easing hardware-speculation risk.
KEY TAKEAWAYS
- Sam Altman called Cerebras a close partner and said they have a deep engagement on speed.
- Cerebras's customer page lists GPT-5.6 Sol running up to 750 output tokens per second.
- Secondary reports cited a $10.0 billion, 750-megawatt deployment through 2028 but lacked primary confirmation.
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Cerebras Inc. (CBRS) stock rose in premarket trading on Oct. 5, 2026 (ET) after OpenAI Chief Executive Sam Altman posted on Oct. 2 that he regarded the chipmaker as a close partner with a deep engagement on speed, responding to reports about hardware powering OpenAI’s Ultrafast tier.
Altman Reaffirms Partnership and Market Reaction
On Oct. 2, Altman described Cerebras as a “close partner” and said the companies have “a deep engagement pushing on the frontiers of speed.” This statement addressed speculation that Nvidia GPUs, rather than Cerebras systems, powered OpenAI’s Ultrafast service. Following Altman’s post, Cerebras shares rebounded in premarket trading on Oct. 5.
Cerebras Details Ultrafast Performance and Reported Deal
Cerebras’s customer-spotlight page dated Oct. 1, 2026, highlights the OpenAI partnership and states, “OpenAI and Cerebras are partnering to bring the fastest inference to the mainstream.” It lists GPT-5.6 Sol running at up to 750 output tokens per second on Cerebras and GPT-5.3-Codex-Spark at more than 1,000 tokens per second. The page also notes that GPT-5.6 Sol Ultrafast is available in limited preview.
Secondary reports say the companies signed a $10 billion agreement in January for OpenAI to deploy 750 megawatts of Cerebras computing capacity through 2028. An analyst cited in those reports said Nvidia was running an OpenAI Ultrafast workload while Cerebras remained a preferred provider but faced supply constraints.
The reviewed materials do not include a primary contract announcement, SEC filing, or regulatory notice confirming the reported commercial terms or deployment details. Altman’s statement did not specify which hardware powers particular OpenAI products or tiers.
The official Cerebras page provides product performance and availability information but does not offer financial guidance or disclose revenue impact. The reported deal’s accounting treatment, minimum commitments, or exclusivity terms remain undisclosed.
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“OpenAI and Cerebras are partnering to bring the fastest inference to the mainstream,” the Cerebras customer-spotlight page states.
