Model Comparison

DiffusionGemma 26B-A4B vs Nemotron 3 Ultra (550B A55B)Which is better in 2026?

Nemotron 3 Ultra (550B A55B) significantly outperforms across most benchmarks.

Verdict: DiffusionGemma 26B-A4B vs Nemotron 3 Ultra (550B A55B) — which is better?

DiffusionGemma 26B-A4B (by Google) and Nemotron 3 Ultra (550B A55B) (by NVIDIA) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

DiffusionGemma 26B-A4B outperforms in 0 benchmarks, while Nemotron 3 Ultra (550B A55B) is better at 4 benchmarks (GPQA, Humanity's Last Exam, LiveCodeBench v6, MMLU-Pro). Nemotron 3 Ultra (550B A55B) significantly outperforms across most benchmarks.

Choose DiffusionGemma 26B-A4B if…

  • you want the most recent training data — it shipped Jun 2026

Choose Nemotron 3 Ultra (550B A55B) if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

DiffusionGemma 26B-A4B outperforms in 0 benchmarks, while Nemotron 3 Ultra (550B A55B) is better at 4 benchmarks (GPQA, Humanity's Last Exam, LiveCodeBench v6, MMLU-Pro).

Nemotron 3 Ultra (550B A55B) significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

524.8B diff

Nemotron 3 Ultra (550B A55B) has 524.8B more parameters than DiffusionGemma 26B-A4B, making it 2082.5% larger.

Google
DiffusionGemma 26B-A4B
25.2Bparameters
NVIDIA
Nemotron 3 Ultra (550B A55B)
550.0Bparameters
25.2B
DiffusionGemma 26B-A4B
550.0B
Nemotron 3 Ultra (550B A55B)

Input Capabilities

Supported data types and modalities

DiffusionGemma 26B-A4B supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

DiffusionGemma 26B-A4B can handle both text and other forms of data like images, making it suitable for multimodal applications.

DiffusionGemma 26B-A4B

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

DiffusionGemma 26B-A4B is licensed under Apache 2.0, while Nemotron 3 Ultra (550B A55B) uses OpenMDW License v1.1.

License differences may affect how you can use these models in commercial or open-source projects.

DiffusionGemma 26B-A4B

Apache 2.0

Open weights

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

DiffusionGemma 26B-A4B was released on 2026-06-10, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

DiffusionGemma 26B-A4B is 0 month newer than Nemotron 3 Ultra (550B A55B).

DiffusionGemma 26B-A4B

Jun 10, 2026

1 months ago

6d newer
Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

1 months ago

Knowledge Cutoff

When training data ends

DiffusionGemma 26B-A4B has a knowledge cutoff of 2025-01-01, while Nemotron 3 Ultra (550B A55B) has a cutoff of 2025-09-30.

Nemotron 3 Ultra (550B A55B) has more recent training data (up to 2025-09-30), making it potentially better informed about events through that date compared to DiffusionGemma 26B-A4B (2025-01-01).

DiffusionGemma 26B-A4B

Jan 2025

Nemotron 3 Ultra (550B A55B)

Sep 2025

8 mo newer

Outputs Comparison

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Key Takeaways

Google
Supports multimodal inputs
NVIDIA
Higher GPQA score (87.0% vs 73.2%)
Higher Humanity's Last Exam score (37.4% vs 11.9%)
Higher LiveCodeBench v6 score (89.0% vs 69.1%)
Higher MMLU-Pro score (86.8% vs 77.6%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against DiffusionGemma 26B-A4B and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

DiffusionGemma 26B-A4B
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground
AI Model Comparison Table
Feature
Google
DiffusionGemma 26B-A4B
NVIDIA
Nemotron 3 Ultra (550B A55B)

FAQ

Common questions about DiffusionGemma 26B-A4B vs Nemotron 3 Ultra (550B A55B).

Which is better, DiffusionGemma 26B-A4B or Nemotron 3 Ultra (550B A55B)?

Nemotron 3 Ultra (550B A55B) significantly outperforms across most benchmarks. DiffusionGemma 26B-A4B is made by Google and Nemotron 3 Ultra (550B A55B) is made by NVIDIA. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does DiffusionGemma 26B-A4B compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

DiffusionGemma 26B-A4B scores MMMLU: 81.5%, MMLU-Pro: 77.6%, GPQA: 73.2%, MathVision: 70.5%, AIME 2026: 69.1%. Nemotron 3 Ultra (550B A55B) scores RULER: 94.7%, IMO-AnswerBench: 92.3%, PinchBench: 90.0%, LiveCodeBench v6: 89.0%, GPQA: 87.0%.

What are the main differences between DiffusionGemma 26B-A4B and Nemotron 3 Ultra (550B A55B)?

Key differences include multimodal support (yes vs no), licensing (Apache 2.0 vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes DiffusionGemma 26B-A4B and Nemotron 3 Ultra (550B A55B)?

DiffusionGemma 26B-A4B is developed by Google and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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