Model Comparison

GPT-5.2 Pro vs Nemotron 3 Ultra (550B A55B)Which is better in 2026?

GPT-5.2 Pro shows notably better performance in the majority of benchmarks.

Verdict: GPT-5.2 Pro vs Nemotron 3 Ultra (550B A55B) — which is better?

GPT-5.2 Pro (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-5.2 Pro outperforms in 2 benchmarks (BrowseComp, GPQA), while Nemotron 3 Ultra (550B A55B) is better at 1 benchmark (Humanity's Last Exam). GPT-5.2 Pro shows notably better performance in the majority of benchmarks.

Choose GPT-5.2 Pro if…

  • you want the strongest raw capability — it leads on 2 of 3 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

3 benchmarks

GPT-5.2 Pro outperforms in 2 benchmarks (BrowseComp, GPQA), while Nemotron 3 Ultra (550B A55B) is better at 1 benchmark (Humanity's Last Exam).

GPT-5.2 Pro shows notably better performance in the majority of benchmarks.

Mon Jul 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.2 Pro specifies input context (400,000 tokens). Only GPT-5.2 Pro specifies output context (128,000 tokens).

OpenAI
GPT-5.2 Pro
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-5.2 Pro supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

GPT-5.2 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.2 Pro

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.2 Pro 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-5.2 Pro

Proprietary

Closed source

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

GPT-5.2 Pro was released on 2025-12-11, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

Nemotron 3 Ultra (550B A55B) is 6 months newer than GPT-5.2 Pro.

GPT-5.2 Pro

Dec 11, 2025

7 months ago

Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

1 months ago

5mo newer

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while GPT-5.2 Pro'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-5.2 Pro's cutoff date.

GPT-5.2 Pro

—

Nemotron 3 Ultra (550B A55B)

Sep 2025

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Supports multimodal inputs
Higher BrowseComp score (77.9% vs 44.4%)
Higher GPQA score (93.2% vs 87.0%)
NVIDIA
Has open weights
Higher Humanity's Last Exam score (37.4% vs 36.6%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5.2 Pro and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

GPT-5.2 Pro
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5.2 Pro
NVIDIA
Nemotron 3 Ultra (550B A55B)

FAQ

Common questions about GPT-5.2 Pro vs Nemotron 3 Ultra (550B A55B).

Which is better, GPT-5.2 Pro or Nemotron 3 Ultra (550B A55B)?

GPT-5.2 Pro shows notably better performance in the majority of benchmarks. GPT-5.2 Pro 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-5.2 Pro compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

GPT-5.2 Pro scores AIME 2025: 100.0%, HMMT 2025: 100.0%, GPQA: 93.2%, ARC-AGI: 90.5%, BrowseComp: 77.9%. 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-5.2 Pro and Nemotron 3 Ultra (550B A55B)?

GPT-5.2 Pro 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-5.2 Pro 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-5.2 Pro and Nemotron 3 Ultra (550B A55B)?

GPT-5.2 Pro is developed by OpenAI and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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