Model Comparison

Claude Sonnet 5 vs Nemotron 3 Ultra (550B A55B)Which is better in 2026?

Claude Sonnet 5 significantly outperforms across most benchmarks.

Verdict: Claude Sonnet 5 vs Nemotron 3 Ultra (550B A55B) — which is better?

Claude Sonnet 5 (by Anthropic) 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.

Claude Sonnet 5 outperforms in 5 benchmarks (BrowseComp, GDPval-AA, Humanity's Last Exam, SWE-bench Multilingual, SWE-Bench Verified), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks. Claude Sonnet 5 significantly outperforms across most benchmarks.

Choose Claude Sonnet 5 if…

  • you want the strongest raw capability — it leads on 5 of 5 shared benchmarks
  • you want the most recent training data — it shipped Jun 2026

Choose Nemotron 3 Ultra (550B A55B) if…

  • you need open weights you can self-host or fine-tune

Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Claude Sonnet 5 outperforms in 5 benchmarks (BrowseComp, GDPval-AA, Humanity's Last Exam, SWE-bench Multilingual, SWE-Bench Verified), while Nemotron 3 Ultra (550B A55B) is better at 0 benchmarks.

Claude Sonnet 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 Claude Sonnet 5 specifies input context (1,000,000 tokens). Only Claude Sonnet 5 specifies output context (64,000 tokens).

Anthropic
Claude Sonnet 5
Input1,000,000 tokens
Output64,000 tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input- tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Sonnet 5 supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

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

Claude Sonnet 5

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Sonnet 5 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.

Claude Sonnet 5

Proprietary

Closed source

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

Claude Sonnet 5 was released on 2026-06-30, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

Claude Sonnet 5 is 1 month newer than Nemotron 3 Ultra (550B A55B).

Claude Sonnet 5

Jun 30, 2026

2 weeks ago

3w newer
Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

1 months ago

Knowledge Cutoff

When training data ends

Nemotron 3 Ultra (550B A55B) has a documented knowledge cutoff of 2025-09-30, while Claude Sonnet 5'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 Claude Sonnet 5's cutoff date.

Claude Sonnet 5

—

Nemotron 3 Ultra (550B A55B)

Sep 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (1,000,000 tokens)
Supports multimodal inputs
Higher BrowseComp score (84.7% vs 44.4%)
Higher GDPval-AA score (53.9% vs 39.4%)
Higher Humanity's Last Exam score (57.4% vs 37.4%)
Higher SWE-bench Multilingual score (78.3% vs 67.7%)
Higher SWE-Bench Verified score (85.2% vs 70.7%)
NVIDIA
Has open weights

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Claude Sonnet 5
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Sonnet 5
NVIDIA
Nemotron 3 Ultra (550B A55B)

FAQ

Common questions about Claude Sonnet 5 vs Nemotron 3 Ultra (550B A55B).

Which is better, Claude Sonnet 5 or Nemotron 3 Ultra (550B A55B)?

Claude Sonnet 5 significantly outperforms across most benchmarks. Claude Sonnet 5 is made by Anthropic 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 Claude Sonnet 5 compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

Claude Sonnet 5 scores CharXiv-R: 88.3%, ChartMuseum: 86.7%, SWE-Bench Verified: 85.2%, BrowseComp: 84.7%, GDP.pdf: 81.6%. 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 Claude Sonnet 5 and Nemotron 3 Ultra (550B A55B)?

Claude Sonnet 5 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 Claude Sonnet 5 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 Claude Sonnet 5 and Nemotron 3 Ultra (550B A55B)?

Claude Sonnet 5 is developed by Anthropic and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

Related comparisons