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Llama 3.1 Nemotron Ultra 253B v1 (Reasoning)

NVIDIALlamaOpen WeightLlama 3.1 Community License

Description

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.

Release Date
2025-04-07
Parameters
253.0B
Context Length
128K
Modalities
text

Capability Radar

30
general
64
coding
72
reasoning
53
science
70
agents
0
multimodal

Rankings

Domain#RankScoreSource
Code Ranking387
37.0
AA
General Ranking458
31.0
AA
Science356
42.0
AA

Benchmark Scores (LLM Stats)

(LLM Stats (zeroeval))

Chat

IFEvalGoogle Research (2023)89.5%SR

General

BFCL v274.1%SR

Math

MATH-50097.0%SR
AIME 202572.5%SR

Reasoning

GPQANYU + Cohere + Anthropic (2023)76.0%SR
LiveCodeBench66.3%SR

AA Evaluation Indices

(Artificial Analysis)
Math 500(OpenAI (2024), subset of Hendrycks et al. MATH (2021))
95.2
Mmlu Pro(TIGER-Lab (Univ. of Waterloo, Toronto, CMU, 2024))
82.5
Aime(MAA (Mathematical Association of America))
74.7
Gpqa(NYU + Cohere + Anthropic (2023))
72.8
Livecodebench(UC Berkeley + MIT + Cornell (2024))
64.1
Math Index(Artificial Analysis)
63.7
Aime 25(MAA (Mathematical Association of America))
63.7
Ifbench(Google Research (2023))
38.2
Tau2(Sierra + U Toronto + Vector Institute (2025))
11.4
Intelligence Index(Artificial Analysis)
7.5
Hle(Center for AI Safety + Scale AI (2025))
7.4
Terminalbench Hard(Stanford × Laude Institute (2026))
2.3

LLM Stats Category Scores

(LLM Stats (zeroeval))
Chat
90
Instruction Following
90
Structured Output
90
Math
80
Physics
80
Reasoning
80
General
80
Biology
80
Chemistry
80
Code
70
Tool Calling
70

Pricing

Input PriceFree
Output PriceFree
Blended Price (3:1)Free

Speed

Tokens/sec0.0
Time to First Token0.00s
Time to Answer0.00s

Provider Price Ranking

No provider data available

External Sources

LLM StatsArtificial Analysis