Model Comparison

GPT-5 High vs Nemotron 3 Ultra (550B A55B)Which is better in 2026?

GPT-5 High significantly outperforms across most benchmarks.

Verdict: GPT-5 High vs Nemotron 3 Ultra (550B A55B) — which is better?

GPT-5 High (by OpenAI) 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.

GPT-5 High outperforms in 1 benchmarks (GPQA), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks. GPT-5 High significantly outperforms across most benchmarks.

Choose GPT-5 High if…

  • you want the strongest raw capability — it leads on 1 of 1 shared 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

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

GPT-5 High outperforms in 1 benchmarks (GPQA), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.

GPT-5 High significantly outperforms across most benchmarks.

Mon Jul 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5 High specifies input context (400,000 tokens). Only GPT-5 High specifies output context (128,000 tokens).

OpenAI
GPT-5 High
Input400,000 tokens
Output128,000 tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input- tokens
Output- tokens
Mon Jul 27 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5 High supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

GPT-5 High can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5 High

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5 High is licensed under a proprietary license, 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.

GPT-5 High

Proprietary

Closed source

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

GPT-5 High was released on 2025-08-07, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

Nemotron 3 Ultra (550B A55B) is 10 months newer than GPT-5 High.

GPT-5 High

Aug 7, 2025

11 months ago

Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

1 months ago

10mo newer

Knowledge Cutoff

When training data ends

GPT-5 High has a knowledge cutoff of 2024-09-30, 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 GPT-5 High (2024-09-30).

GPT-5 High

Sep 2024

Nemotron 3 Ultra (550B A55B)

Sep 2025

1 yr newer

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Higher GPQA score (87.3% vs 87.0%)
NVIDIA
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5 High and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

GPT-5 High
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5 High
NVIDIA
Nemotron 3 Ultra (550B A55B)

FAQ

Common questions about GPT-5 High vs Nemotron 3 Ultra (550B A55B).

Which is better, GPT-5 High or Nemotron 3 Ultra (550B A55B)?

GPT-5 High significantly outperforms across most benchmarks. GPT-5 High is made by OpenAI 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 GPT-5 High compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

GPT-5 High scores AIME 2025: 94.6%, GPQA: 87.3%. 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 context window sizes for GPT-5 High and Nemotron 3 Ultra (550B A55B)?

GPT-5 High supports 400K tokens and Nemotron 3 Ultra (550B A55B) supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5 High and Nemotron 3 Ultra (550B A55B)?

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

Who makes GPT-5 High and Nemotron 3 Ultra (550B A55B)?

GPT-5 High is developed by OpenAI and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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