OpenAI’s Altman reaffirms close partnership with Cerebras

Sam Altman has called Cerebras a close partner of OpenAI. The timing is not a coincidence. The reaffirmation, shared on X, follows a stretch of speculation about whether the relationship between OpenAI and the AI chipmaker was cooling. Cerebras shares had come under pressure, and a single reassuring message from the most famous CEO in AI tends to carry some weight. What sparked the speculation In early October 2026, market rumors started circulating about OpenAI’s newest Ultrafast-tier model, GPT-6.1 Sol. According to those reports, the model is using Nvidia GPUs for its initial deployment rather than Cerebras hardware. That detail landed awkwardly. Cerebras pitches its technology specifically for ultra-low-latency inference, which is a technical way of saying it is built to make AI respond faster. An “Ultrafast” model running elsewhere looked, to some investors, like a snub. Altman’s message appears designed to close that gap. Partners, in his telling, remain partners, even when a particular launch runs on someone else’s silicon. The deal behind the drama On January 14, 2026, OpenAI and Cerebras Systems announced a multi-year partnership. OpenAI committed to purchase up to 750 meg...