What is the difference between GPT-5.4 Nano and Grok 4.1 Fast?

GPT-5.4 Nano is developed by OpenAI while Grok 4.1 Fast is developed by xAI. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.4 Nano or Grok 4.1 Fast?

It depends on your use case. GPT-5.4 Nano and Grok 4.1 Fast each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How can I compare GPT-5.4 Nano and Grok 4.1 Fast on Rival?

This page shows a side-by-side comparison of GPT-5.4 Nano and Grok 4.1 Fast across shared challenges. You can vote on which model produced the better output, and Pro users can create custom challenges to test both models with their own prompts.

Rival

Updated Mar 17, 2026

GPT-5.4 NanovsGrok 4.1 Fast

47 fights queued

Why GPT-5.4 Nano?

4 months newerMar 2026

Why Grok 4.1 Fast?

Dead even. This one's a coin flip.

GPT-5.4 NanoGrok 4.1 Fast

Input price

$0.20/M

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Output price

$1.25/M

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Context

400K

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Released

Mar 2026

Nov 2025

Favorites

GPT-5.4 NanoGrok 4.1 Fast

Movie

The Matrix

19998.2

The Matrix

19998.2

Album

To Pimp a Butterfly

Kendrick Lamar

OK Computer

Radiohead

Book

To Kill a Mockingbird

Harper Lee

The Hitch Hiker's Guide to the Galaxy

Douglas Adams

City

Tokyo

Japan

Tokyo

Japan

Game

The Legend of Zelda: Ocarina of Time

Adventure, Action4.4

The Hitchhiker's Guide to the Galaxy

6 / 47

Estimate Complexityreasoning

Tests an AI's ability to make educated estimates based on technical knowledge

GPT-5.4 Nano

Openai · Mar 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 4.1 Fast

Xai · Nov 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

2 / 47

AI Board Game Logicreasoning

Tests an AI's ability to understand game rules and strategy

GPT-5.4 Nano

Openai · Mar 2026svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 4.1 Fast

Xai · Nov 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

3 / 47

Logic Puzzlereasoning

Tests an AI's ability to solve a simple but potentially confusing logic puzzle

GPT-5.4 Nano

Openai · Mar 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 4.1 Fast

Xai · Nov 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

4 / 47

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-5.4 Nano

Openai · Mar 2026text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Grok 4.1 Fast

Xai · Nov 2025text

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

5 / 47

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5.4 Nano

Openai · Mar 2026svg

Try this prompt

Grok 4.1 Fast

Xai · Nov 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

6 / 47

Xbox Controller SVG Artimage generation

Tests an AI's ability to create detailed SVG illustrations of gaming hardware

GPT-5.4 Nano

Openai · Mar 2026svg

Try this prompt

Grok 4.1 Fast

Xai · Nov 2025svg

Nothing here. The model returned empty. We stared at it for a while.

Try this prompt

Vote

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Our Verdict

GPT-5.4 Nano

Grok 4.1 Fast

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

These are our prompts. Yours will tell you more.

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FAQ

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GPT-5.4 Nano vs Grok 4.1 Fast

Which is better, GPT-5.4 Nano or Grok 4.1 Fast?