Model Comparison

GPT-5.4 vs Nemotron 3 Ultra (550B A55B)Which is better in 2026?

GPT-5.4 significantly outperforms across most benchmarks.

Verdict: GPT-5.4 vs Nemotron 3 Ultra (550B A55B) — which is better?

GPT-5.4 (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-5.4 outperforms in 5 benchmarks (BrowseComp, Finance Agent, GDPval-AA, GPQA, Humanity's Last Exam), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks. GPT-5.4 significantly outperforms across most benchmarks.

Choose GPT-5.4 if…

  • you want the strongest raw capability — it leads on 5 of 5 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
Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

GPT-5.4 outperforms in 5 benchmarks (BrowseComp, Finance Agent, GDPval-AA, GPQA, Humanity's Last Exam), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.

GPT-5.4 significantly outperforms across most benchmarks.

Wed Jun 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.4 specifies input context (1,000,000 tokens). Only GPT-5.4 specifies output context (128,000 tokens).

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input- tokens
Output- tokens
Wed Jun 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-5.4 supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

GPT-5.4 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.4

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.4 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-5.4

Proprietary

Closed source

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

Nemotron 3 Ultra (550B A55B) is 3 months newer than GPT-5.4.

GPT-5.4

Mar 5, 2026

3 months ago

Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

1 weeks ago

3mo newer

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while GPT-5.4's cutoff date is not specified.

We can confirm Nemotron 3 Ultra (550B A55B)'s training data extends to 2025-09-30, but cannot make a direct comparison without GPT-5.4's cutoff date.

GPT-5.4

—

Nemotron 3 Ultra (550B A55B)

Sep 2025

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,000,000 tokens)
Supports multimodal inputs
Higher BrowseComp score (82.7% vs 44.4%)
Higher Finance Agent score (56.0% vs 53.7%)
Higher GDPval-AA score (47.6% vs 39.4%)
Higher GPQA score (92.8% vs 87.0%)
Higher Humanity's Last Exam score (39.8% vs 37.4%)
NVIDIA
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
NVIDIA
Nemotron 3 Ultra (550B A55B)

FAQ

Common questions about GPT-5.4 vs Nemotron 3 Ultra (550B A55B).

Which is better, GPT-5.4 or Nemotron 3 Ultra (550B A55B)?

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 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-5.4 compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

GPT-5.4 scores Tau2 Telecom: 98.9%, ARC-AGI: 93.7%, Graphwalks BFS <128k: 93.0%, GPQA: 92.8%, Graphwalks parents <128k: 89.8%. 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-5.4 and Nemotron 3 Ultra (550B A55B)?

GPT-5.4 supports 1.0M 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-5.4 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-5.4 and Nemotron 3 Ultra (550B A55B)?

GPT-5.4 is developed by OpenAI and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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