NVIDIA · Nemotron Ultra line · flagship · open weights
Llama-3.1-Nemotron-Ultra-253B-v1 was released by NVIDIA on April 7, 2025, as an open-weights flagship model in the Nemotron Ultra line.
No detailed card for this model: we only add numbers published by the maker or by independent benchmarks. Sources: Hugging Face · NVIDIA API Catalog
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Nemotron 3 Ultra is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: Nemotron 3 Ultra · Jun 4, 2026
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