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Grok 4.6 vs Nemotron 3 Ultra (550B A55B)

Comparing Grok 4.6 and Nemotron 3 Ultra (550B A55B) across benchmarks, pricing, and capabilities.

xAI · NVIDIA · Updated for 2026

Which is better?

Grok 4.6 and Nemotron 3 Ultra (550B A55B) trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Grok 4.6

  • you want the most recent training data — it shipped Aug 2026

Choose Nemotron 3 Ultra (550B A55B)

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

At a glance

The differences that matter most.

Grok 4.6
xAI
Nemotron 3 Ultra (550B A55B)
NVIDIA
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$6.00 / M
— / M
Context window
500,000
—
Released
Aug 2026
Jun 2026
License
Proprietary
OpenMDW License v1.1

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok 4.6 and Nemotron 3 Ultra (550B A55B)don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Playground indexes and blind preference scores

Context Window

Maximum input and output token capacity

Only Grok 4.6 specifies input context (500,000 tokens).

xAI
Grok 4.6
Input500,000 tokens
Output- tokens
NVIDIA
Nemotron 3 Ultra (550B A55B)
Input- tokens
Output- tokens
Tue Aug 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4.6 supports multimodal inputs, whereas Nemotron 3 Ultra (550B A55B) does not.

Grok 4.6 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok 4.6

Text
Images
Audio
Video

Nemotron 3 Ultra (550B A55B)

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4.6 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.

Grok 4.6

Proprietary

Closed source

Nemotron 3 Ultra (550B A55B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

Grok 4.6 was released on 2026-08-12, while Nemotron 3 Ultra (550B A55B) was released on 2026-06-04.

Grok 4.6 is 2 months newer than Nemotron 3 Ultra (550B A55B).

Grok 4.6

Aug 12, 2026

1 weeks ago

2mo newer
Nemotron 3 Ultra (550B A55B)

Jun 4, 2026

2 months ago

Knowledge Cutoff

When training data ends

Grok 4.6 has a knowledge cutoff of 2026-02-01, while Nemotron 3 Ultra (550B A55B) has a cutoff of 2025-09-30.

Grok 4.6 has more recent training data (up to 2026-02-01), making it potentially better informed about events through that date compared to Nemotron 3 Ultra (550B A55B) (2025-09-30).

Grok 4.6

Feb 2026

5 mo newer
Nemotron 3 Ultra (550B A55B)

Sep 2025

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok 4.6 and Nemotron 3 Ultra (550B A55B) side-by-side, then vote on the output you prefer.

Grok 4.6
✓ Preferred
Nemotron 3 Ultra (550B A55B)
Open in Playground

FAQ

Common questions about Grok 4.6 vs Nemotron 3 Ultra (550B A55B).

Which is better, Grok 4.6 or Nemotron 3 Ultra (550B A55B)?

Grok 4.6 (xAI) and Nemotron 3 Ultra (550B A55B) (NVIDIA) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Grok 4.6 compare to Nemotron 3 Ultra (550B A55B) in benchmarks?

Grok 4.6 scores CursorBench v3.2: 69.9%, DeepSWE 1.1: 65.9%, FrontierCode: 61.3%, AA-Index: 61.0%, GDPval-AA: 58.4%. 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 Grok 4.6 and Nemotron 3 Ultra (550B A55B)?

Grok 4.6 supports 500K 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 Grok 4.6 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 Grok 4.6 and Nemotron 3 Ultra (550B A55B)?

Grok 4.6 is developed by xAI and Nemotron 3 Ultra (550B A55B) is developed by NVIDIA.

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