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Grok-4 Fast Reasoning vs Nemotron 3.5 Bolt (74B A9B 24GB)

Comparing Grok-4 Fast Reasoning and Nemotron 3.5 Bolt (74B A9B 24GB) across benchmarks, pricing, and capabilities.

xAI · NVIDIA · Updated for 2026

Which is better?

Grok-4 Fast Reasoning and Nemotron 3.5 Bolt (74B A9B 24GB) 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 Fast Reasoning

  • you want predictable pricing at $0.20/M input and $0.50/M output

Choose Nemotron 3.5 Bolt (74B A9B 24GB)

  • 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 Bolt (74B A9B 24GB)
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 Fast Reasoning · 10 for Nemotron 3.5 Bolt (74B A9B 24GB)

No common benchmarks found

Grok-4 Fast Reasoning and Nemotron 3.5 Bolt (74B A9B 24GB)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

Context Window

Maximum input and output token capacity

Only Grok-4 Fast Reasoning specifies input context (2,000,000 tokens). Only Grok-4 Fast Reasoning specifies output context (30,000 tokens).

xAI
Grok-4 Fast Reasoning
Input2,000,000 tokens
Output30,000 tokens
NVIDIA
Nemotron 3.5 Bolt (74B A9B 24GB)
Input- tokens
Output- 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 Bolt (74B A9B 24GB) 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 Bolt (74B A9B 24GB)

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4 Fast Reasoning is licensed under a proprietary license, while Nemotron 3.5 Bolt (74B A9B 24GB) 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 Bolt (74B A9B 24GB)

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 Bolt (74B A9B 24GB) was released on 2026-10-15.

Nemotron 3.5 Bolt (74B A9B 24GB) is 14 months newer than Grok-4 Fast Reasoning.

Grok-4 Fast Reasoning

Aug 28, 2025

1.1 years ago

Nemotron 3.5 Bolt (74B A9B 24GB)

Oct 15, 2026

4 days ago

1.1yr newer

Knowledge Cutoff

When training data ends

Nemotron 3.5 Bolt (74B A9B 24GB) has a documented knowledge cutoff of 2026-05-01, while Grok-4 Fast Reasoning's cutoff date is not specified.

We can confirm Nemotron 3.5 Bolt (74B A9B 24GB)'s training data extends to 2026-05-01, but cannot make a direct comparison without Grok-4 Fast Reasoning's cutoff date.

Grok-4 Fast Reasoning

—

Nemotron 3.5 Bolt (74B A9B 24GB)

May 2026

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Grok-4 Fast Reasoning and Nemotron 3.5 Bolt (74B A9B 24GB) side-by-side, then vote on the output you prefer.

Grok-4 Fast Reasoning
✓ Preferred
Nemotron 3.5 Bolt (74B A9B 24GB)
Open in Playground

FAQ

Common questions about Grok-4 Fast Reasoning vs Nemotron 3.5 Bolt (74B A9B 24GB).

Which is better, Grok-4 Fast Reasoning or Nemotron 3.5 Bolt (74B A9B 24GB)?

Grok-4 Fast Reasoning (xAI) and Nemotron 3.5 Bolt (74B A9B 24GB) (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 Bolt (74B A9B 24GB) in benchmarks?

Nemotron 3.5 Bolt (74B A9B 24GB) scores PinchBench: 87.8%, GPQA: 86.4%, BrowseComp: 66.8%, AA-LCR: 64.1%, MCP Atlas: 52.2%.

What are the context window sizes for Grok-4 Fast Reasoning and Nemotron 3.5 Bolt (74B A9B 24GB)?

Grok-4 Fast Reasoning supports 2.0M tokens and Nemotron 3.5 Bolt (74B A9B 24GB) 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 Fast Reasoning and Nemotron 3.5 Bolt (74B A9B 24GB)?

Key differences include 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 Bolt (74B A9B 24GB)?

Grok-4 Fast Reasoning is developed by xAI and Nemotron 3.5 Bolt (74B A9B 24GB) is developed by NVIDIA.

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