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SemiAnalysis: OpenAI's Jalapeño beats Rubin on perf per watt

Source
x.com
Date
SemiAnalysis@SemiAnalysis_
Thread · 2 parts

BREAKING NEWS🚨🚨 OPENAI'S NEWEST CHIP IS UP TO 2x BETTER PERF PER WATT THAN NVIDIA'S JULY RUBIN PERFORMANCE. OPENAI'S CHIP DIDN'T EVEN ENABLE SPEC DECODING, YET BEATS RUBIN NVL72 WITH SPEC DECODING. (1/2)🧵

OPENAI JALAPENO CHIP IS MEASURED TO HAVE BETTER PERFORMANCE ACROSS THE ENTIRE PARETO VERSUS JULY RUBIN. (2/2)

Why it matters

If a lab's in-house accelerator genuinely beats Nvidia's current part on performance per watt, the cost floor for — and who controls it — starts moving.

Terms in this piece · Glossary
  • speculative decoding — A speed trick where a small model drafts several tokens ahead and the big model verifies them in one pass, often doubling generation speed.
  • inference — Running a trained model to get answers — the phase where AI is actually used, as opposed to trained.
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