Llama 3.1 Nemotron Ultra 253B v1
by NVIDIA
Llama 3.1 Nemotron Ultra 253B v1 is a model from NVIDIA, released on April 7, 2025. It ranks #127 of 220 models by Intelligence Score with a score of 19.1.
A 253B parameter derivative of Meta Llama 3.1 405B Instruct, developed by NVIDIA using Neural Architecture Search (NAS) and vertical compression. It underwent multi-phase post-training (SFT for Math, Code, Reasoning, Chat, Tool Calling; RL with GRPO) to enhance reasoning and instruction-following. Optimized for accuracy/efficiency tradeoff on NVIDIA GPUs. Supports 128k context.
Key specs
| Provider | NVIDIA |
|---|---|
| Release date | 2025-04-07 |
| License | open weights |
| Intelligence Score | 19.1 |
| Coding index | 12.3 |
Quick answers
Is Llama 3.1 Nemotron Ultra 253B v1 open source?
Yes. Llama 3.1 Nemotron Ultra 253B v1 is an open model released under the open weights license.
When was Llama 3.1 Nemotron Ultra 253B v1 released?
NVIDIA released Llama 3.1 Nemotron Ultra 253B v1 on April 7, 2025.
How does Llama 3.1 Nemotron Ultra 253B v1 compare to Claude Opus 5.5 (Reasoning)?
Llama 3.1 Nemotron Ultra 253B v1 scores 19.1 on the Intelligence Score versus 60.5 for Claude Opus 5.5 (Reasoning), the current #1.
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