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Nvidia Nemotron 3 Ultra: 550B Parameter Model Goes Live in 2026
Nvidia released Nemotron 3 Ultra, a 550-billion-parameter open-weight model optimized for long-running agents. While it's the fastest among U.S. open-weight models and promises 30% cost savings, it still lags behind Chinese competitors and GPT-5.5 on core benchmarks.
Alex Chen