ALERT: OpenAI's CFO claims their next big training run will happen in Fall 2026 on Vera Rubin but that doesn't add up. R…

SemiAnalysis Twitter · SemiAnalysis (@SemiAnalysis_) · 2026-06-16

SemiAnalysis disputes OpenAI CFO's claim that a major training run will occur on Nvidia Vera Rubin hardware in Fall 2026, citing cluster stability and software stack immaturity as blockers.

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Appears in

NVIDIA Launches Vera CPU and Vera Rubin NVL72 at COMPUTEX / GTC Taipei

Extraction

Topics: openaiai-training-infrastructurenvidia-hardwarefrontier-model-training

Claims

OpenAI's CFO publicly stated their next major training run will occur in Fall 2026 on Vera Rubin hardware.
Nvidia Vera Rubin NVL72 clusters are unlikely to be sufficiently stable for a large training run by Fall 2026.
The software stack for Vera Rubin will not be mature enough to support a true frontier-scale training run on that timeline.

Key quotes

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.'