Model Comparison

Nemotron 3 Ultra (550B A55B) vs GPT-5.5Which is better in 2026?

GPT-5.5 significantly outperforms across most benchmarks.

Verdict: Nemotron 3 Ultra (550B A55B) vs GPT-5.5 — which is better?

Nemotron 3 Ultra (550B A55B) (by NVIDIA) and GPT-5.5 (by OpenAI) 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.

Nemotron 3 Ultra (550B A55B) outperforms in 1 benchmarks (GDPval-AA), while GPT-5.5 is better at 5 benchmarks (BrowseComp, Finance Agent, Finance Agent v2, GPQA, Humanity's Last Exam). GPT-5.5 significantly outperforms across most benchmarks.

Choose Nemotron 3 Ultra (550B A55B) if…

  • you want the most recent training data — it shipped Jun 2026
  • you need open weights you can self-host or fine-tune

Choose GPT-5.5 if…

  • you want the strongest raw capability — it leads on 5 of 6 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Nemotron 3 Ultra (550B A55B) outperforms in 1 benchmarks (GDPval-AA), while GPT-5.5 is better at 5 benchmarks (BrowseComp, Finance Agent, Finance Agent v2, GPQA, Humanity's Last Exam).

GPT-5.5 significantly outperforms across most benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.5 specifies input context (1,050,000 tokens). Only GPT-5.5 specifies output context (128,000 tokens).

NVIDIA
Nemotron 3 Ultra (550B A55B)
Input- tokens
Output- tokens
OpenAI
GPT-5.5
Input1,050,000 tokens
Output128,000 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.5 supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

GPT-5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

GPT-5.5

Text
Images
Audio
Video

License

Usage and distribution terms

Nemotron 3 Ultra (550B A55B) is licensed under OpenMDW License v1.1, while GPT-5.5 uses a proprietary license.

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

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

Nemotron 3 Ultra (550B A55B) was released on 2026-06-04, while GPT-5.5 was released on 2026-04-23.

Nemotron 3 Ultra (550B A55B) is 1 month newer than GPT-5.5.

Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

1 months ago

1mo newer
GPT-5.5

Apr 23, 2026

2 months ago

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a knowledge cutoff of 2025-09-30, while GPT-5.5 has a cutoff of 2025-12-01.

GPT-5.5 has more recent training data (up to 2025-12-01), making it potentially better informed about events through that date compared to Nemotron 3 Ultra (550B A55B) (2025-09-30).

Nemotron 3 Ultra (550B A55B)

Sep 2025

GPT-5.5

Dec 2025

3 mo newer

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

NVIDIA
Has open weights
Higher GDPval-AA score (39.4% vs 37.8%)
OpenAI
Larger context window (1,050,000 tokens)
Supports multimodal inputs
Higher BrowseComp score (84.4% vs 44.4%)
Higher Finance Agent score (60.0% vs 53.7%)
Higher Finance Agent v2 score (51.8% vs 37.5%)
Higher GPQA score (93.6% vs 87.0%)
Higher Humanity's Last Exam score (52.2% vs 37.4%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Nemotron 3 Ultra (550B A55B) and GPT-5.5 side-by-side, then vote on the output you prefer.

Nemotron 3 Ultra (550B A55B)
✓ Preferred
GPT-5.5
Open in Playground
AI Model Comparison Table
Feature
NVIDIA
Nemotron 3 Ultra (550B A55B)
OpenAI
GPT-5.5

FAQ

Common questions about Nemotron 3 Ultra (550B A55B) vs GPT-5.5.

Which is better, Nemotron 3 Ultra (550B A55B) or GPT-5.5?

GPT-5.5 significantly outperforms across most benchmarks. Nemotron 3 Ultra (550B A55B) is made by NVIDIA and GPT-5.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Nemotron 3 Ultra (550B A55B) compare to GPT-5.5 in benchmarks?

Nemotron 3 Ultra (550B A55B) scores RULER: 94.7%, IMO-AnswerBench: 92.3%, PinchBench: 90.0%, LiveCodeBench v6: 89.0%, GPQA: 87.0%. GPT-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

What are the context window sizes for Nemotron 3 Ultra (550B A55B) and GPT-5.5?

Nemotron 3 Ultra (550B A55B) supports an unknown number of tokens and GPT-5.5 supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Nemotron 3 Ultra (550B A55B) and GPT-5.5?

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

Who makes Nemotron 3 Ultra (550B A55B) and GPT-5.5?

Nemotron 3 Ultra (550B A55B) is developed by NVIDIA and GPT-5.5 is developed by OpenAI.

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