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SearchCerebras shares rose 9.73% on Monday and moved closer to their IPO price after Sam Altman described the company as a close partner. The rebound followed questions about the use of its chips in a GPT-6.1 mode and came as new shares became available to some holders.
Cerebras Systems shares advanced 9.73% on Monday, October 5, 2026, to $182.63, after Sam Altman publicly reaffirmed the company’s relationship with OpenAI. The price was close to the $185 set in Cerebras’s initial public offering (IPO).
In a post on X, the OpenAI CEO described Cerebras as a “close partner” and said the two companies maintain a deep collaboration to increase the speed of their artificial intelligence systems. His comments helped stem the stock’s recent decline, although they do not, by themselves, determine the future performance of the business or its share price.
The market reaction came after reports called Cerebras’s role in OpenAI’s infrastructure into question. Specifically, a report attributed to the research firm SemiAnalysis said that the “Ultrafast” mode of the GPT-6.1 Sol model would use Nvidia graphics processors instead of Cerebras hardware. That information weighed on the shares and fueled speculation about the scope of the relationship between the two companies.
Altman did not specify in his post which products or workloads the current collaboration covers. His statement therefore confirms that the companies are still working together, but does not, by itself, resolve questions about which chips are used in each of OpenAI’s model modes.
The partnership is commercially significant for Cerebras: in January, the two companies announced a multiyear agreement to deploy 750 megawatts of Cerebras systems, with a reported value of more than $10 billion. The announced size of the agreement helps explain why news about OpenAI can influence market expectations for the chip company.
The relationship with OpenAI was not the only factor in the stock’s performance. Cerebras structured the post-IPO restrictions in several share releases. According to available reports, up to 19.4 million shares held by executives, employees, and other holders became eligible for sale on September 30.
The fact that these shares can be sold does not mean they have all been sold. However, the possibility of an increase in the supply of shares on the market may coincide with other factors that influence the share price. One report also placed Monday’s gain in the context of a cumulative decline of about 14.6% during the previous month, making the rebound a partial recovery.
Cerebras develops chips, systems, and software to train and run artificial intelligence models, and competes in a market where Nvidia holds a dominant position. A central challenge for the company is turning interest in inference speed into sustained contracts and activity amid intense competition.
Monday’s rise reflects investors’ response to Altman’s public statement and the temporary reduction in uncertainty about the partnership. It does not guarantee that OpenAI will use Cerebras hardware in all its modes, or that the share price will sustain its gains. Recent volatility and the availability of shares subject to restrictions remain part of CBRS’s financial context.
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