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Grok 4.6 vs Llama 3.1 Nemotron Ultra 253B v1

Comparing Grok 4.6 and Llama 3.1 Nemotron Ultra 253B v1 across benchmarks, pricing, and capabilities.

xAI · NVIDIA · Updated for 2026

Which is better?

Grok 4.6 and Llama 3.1 Nemotron Ultra 253B v1 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 Llama 3.1 Nemotron Ultra 253B v1

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

At a glance

The differences that matter most.

Grok 4.6
xAI
Llama 3.1 Nemotron Ultra 253B v1
NVIDIA
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$6.00 / M
— / M
Context window
500,000
—
Released
Aug 2026
Apr 2025
License
Proprietary
Llama 3.1 Community License

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Grok 4.6 and Llama 3.1 Nemotron Ultra 253B v1don'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
Llama 3.1 Nemotron Ultra 253B v1
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 Llama 3.1 Nemotron Ultra 253B v1 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

Llama 3.1 Nemotron Ultra 253B v1

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4.6 is licensed under a proprietary license, while Llama 3.1 Nemotron Ultra 253B v1 uses Llama 3.1 Community License.

License differences may affect how you can use these models in commercial or open-source projects.

Grok 4.6

Proprietary

Closed source

Llama 3.1 Nemotron Ultra 253B v1

Llama 3.1 Community License

Open weights

Release Timeline

When each model was launched

Grok 4.6 was released on 2026-08-12, while Llama 3.1 Nemotron Ultra 253B v1 was released on 2025-04-07.

Grok 4.6 is 16 months newer than Llama 3.1 Nemotron Ultra 253B v1.

Grok 4.6

Aug 12, 2026

1 weeks ago

1.3yr newer
Llama 3.1 Nemotron Ultra 253B v1

Apr 7, 2025

1.4 years ago

Knowledge Cutoff

When training data ends

Grok 4.6 has a knowledge cutoff of 2026-02-01, while Llama 3.1 Nemotron Ultra 253B v1 has a cutoff of 2023-12-01.

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 Llama 3.1 Nemotron Ultra 253B v1 (2023-12-01).

Grok 4.6

Feb 2026

2.2 yr newer
Llama 3.1 Nemotron Ultra 253B v1

Dec 2023

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok 4.6 and Llama 3.1 Nemotron Ultra 253B v1 side-by-side, then vote on the output you prefer.

Grok 4.6
✓ Preferred
Llama 3.1 Nemotron Ultra 253B v1
Open in Playground

FAQ

Common questions about Grok 4.6 vs Llama 3.1 Nemotron Ultra 253B v1.

Which is better, Grok 4.6 or Llama 3.1 Nemotron Ultra 253B v1?

Grok 4.6 (xAI) and Llama 3.1 Nemotron Ultra 253B v1 (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 Llama 3.1 Nemotron Ultra 253B v1 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%. Llama 3.1 Nemotron Ultra 253B v1 scores MATH-500: 97.0%, IFEval: 89.5%, GPQA: 76.0%, BFCL v2: 74.1%, AIME 2025: 72.5%.

What are the context window sizes for Grok 4.6 and Llama 3.1 Nemotron Ultra 253B v1?

Grok 4.6 supports 500K tokens and Llama 3.1 Nemotron Ultra 253B v1 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 Llama 3.1 Nemotron Ultra 253B v1?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs Llama 3.1 Community License). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4.6 and Llama 3.1 Nemotron Ultra 253B v1?

Grok 4.6 is developed by xAI and Llama 3.1 Nemotron Ultra 253B v1 is developed by NVIDIA.

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