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Grok-4.1 Fast Reasoning vs Nemotron Nano 9B v2

Comparing Grok-4.1 Fast Reasoning and Nemotron Nano 9B v2 across benchmarks, pricing, and capabilities.

xAI · NVIDIA · Updated for 2026

Which is better?

Grok-4.1 Fast Reasoning and Nemotron Nano 9B v2 trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Grok-4.1 Fast Reasoning

  • you want the most recent training data — it shipped Nov 2025

Choose Nemotron Nano 9B v2

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

At a glance

The differences that matter most.

Grok-4.1 Fast Reasoning
xAI
Nemotron Nano 9B v2
NVIDIA
Benchmark wins
—
—
Input price
$0.20 / M
— / M
Output price
$0.50 / M
— / M
Context window
2,000,000
—

Individual benchmarks

0 reported for Grok-4.1 Fast Reasoning · 6 for Nemotron Nano 9B v2

No common benchmarks found

Grok-4.1 Fast Reasoning and Nemotron Nano 9B v2don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Grok-4.1 Fast Reasoning specifies input context (2,000,000 tokens). Only Grok-4.1 Fast Reasoning specifies output context (30,000 tokens).

xAI
Grok-4.1 Fast Reasoning
Input2,000,000 tokens
Output30,000 tokens
NVIDIA
Nemotron Nano 9B v2
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Grok-4.1 Fast Reasoning supports multimodal inputs, whereas Nemotron Nano 9B v2 does not.

Grok-4.1 Fast Reasoning can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok-4.1 Fast Reasoning

Text
Images
Audio
Video

Nemotron Nano 9B v2

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4.1 Fast Reasoning is licensed under a proprietary license, while Nemotron Nano 9B v2 uses NVIDIA Open Model License Agreement .

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

Grok-4.1 Fast Reasoning

Proprietary

Closed source

Nemotron Nano 9B v2

NVIDIA Open Model License Agreement

Open weights

Release Timeline

When each model was launched

Grok-4.1 Fast Reasoning was released on 2025-11-17, while Nemotron Nano 9B v2 was released on 2025-08-18.

Grok-4.1 Fast Reasoning is 3 months newer than Nemotron Nano 9B v2.

Grok-4.1 Fast Reasoning

Nov 17, 2025

10 months ago

3mo newer
Nemotron Nano 9B v2

Aug 18, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Nemotron Nano 9B v2 has a documented knowledge cutoff of 2024-09-01, while Grok-4.1 Fast Reasoning's cutoff date is not specified.

We can confirm Nemotron Nano 9B v2's training data extends to 2024-09-01, but cannot make a direct comparison without Grok-4.1 Fast Reasoning's cutoff date.

Grok-4.1 Fast Reasoning

—

Nemotron Nano 9B v2

Sep 2024

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok-4.1 Fast Reasoning and Nemotron Nano 9B v2 side-by-side, then vote on the output you prefer.

Grok-4.1 Fast Reasoning
✓ Preferred
Nemotron Nano 9B v2
Open in Playground

FAQ

Common questions about Grok-4.1 Fast Reasoning vs Nemotron Nano 9B v2.

Which is better, Grok-4.1 Fast Reasoning or Nemotron Nano 9B v2?

Grok-4.1 Fast Reasoning (xAI) and Nemotron Nano 9B v2 (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-4.1 Fast Reasoning compare to Nemotron Nano 9B v2 in benchmarks?

Nemotron Nano 9B v2 scores MATH-500: 97.8%, IFEval: 90.3%, AIME 2025: 72.1%, LiveCodeBench: 71.1%, BFCL_v3_MultiTurn: 66.9%.

What are the context window sizes for Grok-4.1 Fast Reasoning and Nemotron Nano 9B v2?

Grok-4.1 Fast Reasoning supports 2.0M tokens and Nemotron Nano 9B v2 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-4.1 Fast Reasoning and Nemotron Nano 9B v2?

Key differences include multimodal support (yes vs no), licensing (Proprietary vs NVIDIA Open Model License Agreement ). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-4.1 Fast Reasoning and Nemotron Nano 9B v2?

Grok-4.1 Fast Reasoning is developed by xAI and Nemotron Nano 9B v2 is developed by NVIDIA.

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