What is the difference between GPT-5.4 Mini and xAI: Grok 4?

GPT-5.4 Mini is developed by OpenAI while xAI: Grok 4 is developed by xAI. GPT-5.4 Mini has a 400K token context window vs xAI: Grok 4's 256K. You can compare their actual outputs across 38 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.4 Mini or xAI: Grok 4?

It depends on your use case. GPT-5.4 Mini and xAI: Grok 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 38 challenges so you can judge which fits your needs best.

How much does GPT-5.4 Mini cost compared to xAI: Grok 4?

GPT-5.4 Mini costs $0.75/M input tokens and xAI: Grok 4 costs $3/M input tokens. GPT-5.4 Mini is $2.25/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-5.4 Mini and xAI: Grok 4 on Rival?

This page shows a side-by-side comparison of GPT-5.4 Mini and xAI: Grok 4 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 MinivsxAI: Grok 4

38 fights queued

Why GPT-5.4 Mini?

3.4x cheaper overall$0.75/M in · $4.50/M out

1.6x more context400K

8 months newerMar 2026

Why xAI: Grok 4?

Dead even. This one's a coin flip.

GPT-5.4 MinixAI: Grok 4

Input price

$0.75/M

$3.00/M

Output price

$4.50/M

$15.00/M

Context

400K

256K

Released

Mar 2026

Jul 2025

Favorites

GPT-5.4 MinixAI: Grok 4

Movie

The Godfather

19728.7

The Matrix

19998.2

Album

Kid A

Radiohead

The Dark Side of the Moon

Pink Floyd

Book

Pride and Prejudice

Jane Austen

The Hitch Hiker's Guide to the Galaxy

Douglas Adams

City

Kyoto

Japan

Tokyo

Japan

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

Portal

Action, Puzzle4.5

6 / 38

Estimate Complexityreasoning

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

GPT-5.4 Mini

Openai · Mar 2026text

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

Try this prompt

xAI: Grok 4

Xai · Jul 2025text

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

Try this prompt

Vote

2 / 38

Logic Puzzlereasoning

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

GPT-5.4 Mini

Openai · Mar 2026text

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

Try this prompt

xAI: Grok 4

Xai · Jul 2025text

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

Try this prompt

Vote

3 / 38

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-5.4 Mini

Openai · Mar 2026text

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

Try this prompt

xAI: Grok 4

Xai · Jul 2025text

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

Try this prompt

Vote

4 / 38

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5.4 Mini

Openai · Mar 2026svg

Try this prompt

xAI: Grok 4

Xai · Jul 2025svg

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

Try this prompt

Vote

5 / 38

Xbox Controller SVG Artimage generation

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

GPT-5.4 Mini

Openai · Mar 2026svg

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

Try this prompt

xAI: Grok 4

Xai · Jul 2025svg

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

Try this prompt

Vote

6 / 38

Realistic AI Interviewconversation

Tests an AI's ability to simulate personalities and predict future trends

GPT-5.4 Mini

Openai · Mar 2026text

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

Try this prompt

xAI: Grok 4

Xai · Jul 2025text

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 Mini

xAI: Grok 4

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

GPT-5.4 Mini is 3.3x cheaper per token — worth considering if cost matters.

Too close to call

These are our prompts. Yours will tell you more.

Run GPT-5.4 Mini vs xAI: Grok 4 on your actual task. 5 free credits. No card.

Test with your prompt

FAQ

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GPT-5.4 Mini vs xAI: Grok 4

Which is better, GPT-5.4 Mini or xAI: Grok 4?