The AI arena is free today

Open Superagent

Grok-4 Fast Reasoning vs Nemotron 3.5 Super VL (120B A12B)

Comparing Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B) across benchmarks, pricing, and capabilities.

xAI · NVIDIA · Updated for 2026

Which is better?

Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B) trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Grok-4 Fast Reasoning is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok-4 Fast Reasoning also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.

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

Choose Grok-4 Fast Reasoning

  • cost matters — it's about 1.5x cheaper per token
  • you process long inputs — it offers a 2,000,000 token context window

Choose Nemotron 3.5 Super VL (120B A12B)

  • you want the most recent training data — it shipped Oct 2026
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Grok-4 Fast Reasoning
xAI
Nemotron 3.5 Super VL (120B A12B)
NVIDIA
Benchmark wins
—
—
Input price
$0.20 / M
$0.20 / M
Output price
$0.50 / M
$1.00 / M
Context window
2,000,000
262,144

Individual benchmarks

0 reported for Grok-4 Fast Reasoning · 19 for Nemotron 3.5 Super VL (120B A12B)

No common benchmarks found

Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B)don'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

Pricing Analysis

Price comparison per million tokens

Grok-4 Fast Reasoning costs less

For input processing, Grok-4 Fast Reasoning ($0.20/1M tokens) costs the same as Nemotron 3.5 Super VL (120B A12B) ($0.20/1M tokens).

For output processing, Grok-4 Fast Reasoning ($0.50/1M tokens) is 2.0x cheaper than Nemotron 3.5 Super VL (120B A12B) ($1.00/1M tokens).

In conclusion, Nemotron 3.5 Super VL (120B A12B) is more expensive than Grok-4 Fast Reasoning.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Oct 19 2026 • llm-stats.com
xAI
Grok-4 Fast Reasoning
Input tokens$0.20
Output tokens$0.50
Best providerxAI
NVIDIA
Nemotron 3.5 Super VL (120B A12B)
Input tokens$0.20
Output tokens$1.00
Best providerDeepinfra
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Grok-4 Fast Reasoning accepts 2,000,000 input tokens compared to Nemotron 3.5 Super VL (120B A12B)'s 262,144 tokens. Nemotron 3.5 Super VL (120B A12B) can generate longer responses up to 262,144 tokens, while Grok-4 Fast Reasoning is limited to 30,000 tokens.

xAI
Grok-4 Fast Reasoning
Input2,000,000 tokens
Output30,000 tokens
NVIDIA
Nemotron 3.5 Super VL (120B A12B)
Input262,144 tokens
Output262,144 tokens
Mon Oct 19 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B) support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok-4 Fast Reasoning

Text
Images
Audio
Video

Nemotron 3.5 Super VL (120B A12B)

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4 Fast Reasoning is licensed under a proprietary license, while Nemotron 3.5 Super VL (120B A12B) uses OpenMDW License v1.1.

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

Grok-4 Fast Reasoning

Proprietary

Closed source

Nemotron 3.5 Super VL (120B A12B)

OpenMDW License v1.1

Open weights

Release Timeline

When each model was launched

Grok-4 Fast Reasoning was released on 2025-08-28, while Nemotron 3.5 Super VL (120B A12B) was released on 2026-10-15.

Nemotron 3.5 Super VL (120B A12B) is 14 months newer than Grok-4 Fast Reasoning.

Grok-4 Fast Reasoning

Aug 28, 2025

1.1 years ago

Nemotron 3.5 Super VL (120B A12B)

Oct 15, 2026

2 days ago

1.1yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Grok-4 Fast Reasoning is available from xAI. Nemotron 3.5 Super VL (120B A12B) is available from DeepInfra.

Grok-4 Fast Reasoning

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M

Nemotron 3.5 Super VL (120B A12B)

deepinfra logo
Deepinfra
Input Price:Input: $0.20/1MOutput Price:Output: $1.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B) side-by-side, then vote on the output you prefer.

Grok-4 Fast Reasoning
✓ Preferred
Nemotron 3.5 Super VL (120B A12B)
Open in Playground

FAQ

Common questions about Grok-4 Fast Reasoning vs Nemotron 3.5 Super VL (120B A12B).

Which is better, Grok-4 Fast Reasoning or Nemotron 3.5 Super VL (120B A12B)?

Grok-4 Fast Reasoning (xAI) and Nemotron 3.5 Super VL (120B A12B) (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 Fast Reasoning compare to Nemotron 3.5 Super VL (120B A12B) in benchmarks?

Nemotron 3.5 Super VL (120B A12B) scores GPQA: 89.5%, LiveCodeBench v6: 88.2%, CharXiv-R: 80.8%, MathVision: 78.2%, BrowseComp: 78.0%.

Is Grok-4 Fast Reasoning cheaper than Nemotron 3.5 Super VL (120B A12B)?

Both models cost $0.20 per million input tokens.

What are the context window sizes for Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B)?

Grok-4 Fast Reasoning supports 2.0M tokens and Nemotron 3.5 Super VL (120B A12B) supports 262K 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 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B)?

Key differences include context window (2.0M vs 262K), licensing (Proprietary vs OpenMDW License v1.1). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-4 Fast Reasoning and Nemotron 3.5 Super VL (120B A12B)?

Grok-4 Fast Reasoning is developed by xAI and Nemotron 3.5 Super VL (120B A12B) is developed by NVIDIA.

Related comparisons