# Nemotron 3 Ultra 550B A55B ![Organization](https://img.shields.io/badge/Org-NVIDIA-76b900) ![License](https://img.shields.io/badge/License-NVIDIA%20Open-22c55e) ![Released](https://img.shields.io/badge/Released-Jun%202025-555) ![MoE](https://img.shields.io/badge/Type-MoE-6366f1) ![Params](https://img.shields.io/badge/Params-550B%2F55B%20active-blue) > **Quick answer:** NVIDIA Nemotron 3 Ultra 550B A55B is NVIDIA's June 2025 MoE flagship scoring 87.0% GPQA Diamond, 94.2% AIME 2026, 37.4% HLE, 44.4% BrowseComp, 44.6% SciCode, and 86.8% MMLU-Pro. NVIDIA Open Model License with 550B total / 55B active parameters. ## At a Glance **Where Nemotron 3 Ultra 550B leads** - 87.0% GPQA Diamond — strong graduate-level science - 94.2% AIME 2026 — excellent competition mathematics - 81.4% IFBench — strong instruction following - 44.6% SciCode — competitive scientific coding - NVIDIA Open Model License — available for research and production **Where it lags** - 37.4% HLE — below Kimi K2.6 (36.4%) and frontier models - 44.4% BrowseComp — below Kimi K2.6 (83.2%) and GPT-5.5 (84.4%) - Very large: 550B params, 55B active — requires significant infrastructure **Best for:** NVIDIA NIM deployments; enterprise customers on NVIDIA AI infrastructure; large-scale scientific reasoning tasks. ## What Nemotron 3 Ultra 550B A55B Is Nemotron 3 Ultra 550B A55B is NVIDIA's June 2025 flagship MoE model — the largest in the Nemotron 3 generation. As a successor to Llama-based Nemotron variants (like Nemotron Ultra 253B), this model is NVIDIA's own MoE architecture with 550B total parameters and 55B active per token. At the GPQA Diamond (87%) and AIME (94.2%) tier, it competes with strong frontier models for STEM reasoning, though it is below Kimi K2.6 and GLM-5.2 on HLE and BrowseComp tasks. ## Specifications | Field | Value | |---|---| | Organization | NVIDIA | | License | NVIDIA Open Model License | | HuggingFace | nvidia/Nemotron-3-Ultra-550B-A55B | | Release date | June 2025 | | Parameters | 550B total / 55B active (MoE) | | Modality | Text only | ## Pricing Available under NVIDIA Open Model License — check for usage restrictions. Available via NVIDIA NIM API and cloud providers. ## Public Benchmark Scores | Benchmark | Score | Source | Date | |---|---|---|---| | [GPQA Diamond](/benchmarks/gpqa-diamond) | 87.0% | Benchgen evaluation | 2025-06 | | [AIME 2026](/benchmarks/aime-2026) | 94.2% | Benchgen evaluation | 2025-06 | | [Humanity's Last Exam](/benchmarks/humanitys-last-exam) | 37.4% | Benchgen evaluation | 2025-06 | | [BrowseComp](/benchmarks/browsecomp) | 44.4% | Benchgen evaluation | 2025-06 | | [SimpleQA](/benchmarks/simpleqa) | 32.4% | Benchgen evaluation | 2025-06 | | [MMLU-Pro](/benchmarks/mmlu-pro) | 86.8% | Benchgen evaluation | 2025-06 | | [SciCode](/benchmarks/scicode) | 44.6% | Benchgen evaluation | 2025-06 | | [IFBench](/benchmarks/ifbench) | 81.4% | Benchgen evaluation | 2025-06 | ## Nemotron 3 Ultra 550B vs Alternatives | Model | GPQA Diamond | HLE | MMLU-Pro | License | |---|---|---|---|---| | **Nemotron 3 Ultra 550B** | 87.0% | 37.4% | 86.8% | NVIDIA Open | | [Kimi K2.6](/models/moonshot/kimi-k2-6) | 90.5% | 36.4% | — | Apache 2.0 | | [Llama 3.1 Nemotron Ultra 253B](/models/nvidia/llama-3-1-nemotron-ultra-253b-v1) | — | — | — | Llama 3.1 | | [DeepSeek-R1 0528](/models/deepseek/deepseek-r1-0528) | 81.0% | — | 85% | MIT | Nemotron 3 Ultra 550B vs Kimi K2.6: similar HLE tier (37.4% vs 36.4%), lower GPQA Diamond (87% vs 90.5%), worse BrowseComp (44.4% vs 83.2%). Kimi K2.6 is superior on most metrics with Apache 2.0 license. ## Related Models & Benchmarks - Compare: [Kimi K2.6](/models/moonshot/kimi-k2-6) · [Llama 3.1 Nemotron Ultra 253B](/models/nvidia/llama-3-1-nemotron-ultra-253b-v1) · [DeepSeek-R1 0528](/models/deepseek/deepseek-r1-0528) - Benchmarks: [GPQA Diamond](/benchmarks/gpqa-diamond) · [AIME 2026](/benchmarks/aime-2026) · [BrowseComp](/benchmarks/browsecomp) ## Frequently Asked Questions

What is Nemotron 3 Ultra 550B A55B?

NVIDIA's June 2025 MoE flagship: 550B total / 55B active parameters, scoring 87.0% GPQA Diamond, 94.2% AIME, 37.4% HLE, 86.8% MMLU-Pro. NVIDIA Open Model License.

How does Nemotron 3 Ultra 550B compare to Kimi K2.6?

Kimi K2.6 outperforms on most metrics: higher GPQA Diamond (90.5% vs 87%), much higher BrowseComp (83.2% vs 44.4%), better SWE-Bench (80.2%). Kimi K2.6 is Apache 2.0. Nemotron 3 Ultra suits teams within the NVIDIA NIM ecosystem.

--- *Specs from NVIDIA's Nemotron 3 Ultra 550B A55B release (June 2025) and Benchgen evaluations. Last updated 2026-07-24.*

Nemotron 3 Ultra (550B A55B) — Training jobs

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