What is the difference between Grok 3 and GPT-4o (Omni)?

Grok 3 is developed by xAI while GPT-4o (Omni) is developed by OpenAI. Grok 3 has a 128K token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 28 challenges on Rival to see how they differ in practice.

Which is better, Grok 3 or GPT-4o (Omni)?

It depends on your use case. Grok 3 and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 28 challenges so you can judge which fits your needs best.

How can I compare Grok 3 and GPT-4o (Omni) on Rival?

This page shows a side-by-side comparison of Grok 3 and GPT-4o (Omni) 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 Feb 18, 2025

Grok 3vsGPT-4o (Omni)

28 fights queued

Why Grok 3?

Stronger on HumanEval94.5% vs 90.2%

9 months newerFeb 2025

Why GPT-4o (Omni)?

Leads 3 of 4 benchmarks

Stronger on MATH75.9% vs 69.7%

Grok 3GPT-4o (Omni)

Input price

—

$2.50/M

Output price

—

$10.00/M

Context

128K

Released

Feb 2025

May 2024

Benchmarks4 common

MMLU

83.1%

88.7%+6.3%

GPQA

51.9%

53.1%+2.3%

MATH

69.7%

75.9%+8.2%

HumanEval

94.5%+4.6%

90.2%

Favorites

Grok 3GPT-4o (Omni)

Movie

—

Inception

20108.4

Album

—

Dark Side Of The Moon

suisside

Book

—

To Kill a Mockingbird

Harper Lee

City

—

Kyoto

Japan

Game

—

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

6 / 28

Estimate Complexityreasoning

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

Grok 3

Xai · Feb 2025text

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

Try this prompt

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

2 / 28

AI Board Game Logicreasoning

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

Grok 3

Xai · Feb 2025svg

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

Try this prompt

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Vote

3 / 28

Math Misconception Testreasoning

Tests an AI's understanding of number representation

Grok 3

Xai · Feb 2025text

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

Try this prompt

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

4 / 28

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

Grok 3

Xai · Feb 2025text

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

Try this prompt

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Vote

5 / 28

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

Grok 3

Xai · Feb 2025svg

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

Try this prompt

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Vote

6 / 28

Xbox Controller SVG Artimage generation

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

Grok 3

Xai · Feb 2025svg

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

Try this prompt

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Vote

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Our Verdict

Grok 3

GPT-4o (Omni)

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.

Run Grok 3 vs GPT-4o (Omni) on your actual task. 5 free credits. No card.

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FAQ

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Grok 3 vs GPT-4o (Omni)

Which is better, Grok 3 or GPT-4o (Omni)?