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Nvidia unveils 550 billion-parameter Nemotron 3 Ultra, starts mass production of Vera Rubin

Nvidia unveiled its 550 billion-parameter open AI model Nemotron 3 Ultra and said it has started mass production of its next AI server platform Vera Rubin. CEO Jensen Huang introduced both at a GTC Taipei 2026 keynote. Nvidia said the model will be released in open form this week and highlighted competitiveness in benchmarks and token generation speed, while an external index score trailed a leading Chinese model.