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OpenAI's 2026 training run on Vera Rubin questioned by analysts

SemiAnalysis reports that OpenAI's CFO has stated the company's next major training run is scheduled for Fall 2026, utilizing the Vera Rubin facility. However, the analysis suggests this timeline is unrealistic, citing potential instability of the Rubin NVL72 clusters and immaturity of the necessary software stack by that date. The publication posits that Vera Rubin may only be suitable for smaller-scale experiments, not frontier-level training, in Fall 2026. AI

IMPACT Questions the feasibility of large-scale AI training infrastructure timelines, potentially impacting future model development schedules.

RANK_REASON The item is an analysis and opinion piece questioning a stated timeline for a future event, rather than reporting on a confirmed event.

Read on X — SemiAnalysis →

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COVERAGE [1]

  1. X — SemiAnalysis TIER_1 English(EN) · SemiAnalysis_ ·

    ALERT: OpenAI's CFO claims their next big training run will happen in Fall 2026 on Vera Rubin but that doesn't add up. Rubin NVL72 clusters likely won't be stab

    ALERT: OpenAI's CFO claims their next big training run will happen in Fall 2026 on Vera Rubin but that doesn't add up. Rubin NVL72 clusters likely won't be stable enough by then, and the software stack won't be mature enough to support a true "big training run." Rubin may be http…