What is the difference between GPT-4o (Omni) and Mistral Small 4?

GPT-4o (Omni) is developed by OpenAI while Mistral Small 4 is developed by Mistral AI. GPT-4o (Omni) has a 128K token context window vs Mistral Small 4's 262K. You can compare their actual outputs across 51 challenges on Rival to see how they differ in practice.

Which is better, GPT-4o (Omni) or Mistral Small 4?

It depends on your use case. GPT-4o (Omni) and Mistral Small 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 51 challenges so you can judge which fits your needs best.

How much does GPT-4o (Omni) cost compared to Mistral Small 4?

GPT-4o (Omni) costs $2.5/M input tokens and Mistral Small 4 costs $0.15/M input tokens. Mistral Small 4 is $2.35/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-4o (Omni) and Mistral Small 4 on Rival?

This page shows a side-by-side comparison of GPT-4o (Omni) and Mistral Small 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 16, 2026

GPT-4o (Omni)vsMistral Small 4

46 fights queued

Why GPT-4o (Omni)?

Dead even. This one's a coin flip.

Why Mistral Small 4?

16.7x cheaper overall$0.15/M in · $0.60/M out

2x more context262K

22 months newerMar 2026

Favorites

GPT-4o (Omni)Mistral Small 4

Movie

Inception

20108.4

The Dark Knight

20088.5

Album

Dark Side Of The Moon

suisside

OK Computer

Radiohead

Book

To Kill a Mockingbird

Harper Lee

Братья Карамазовы

Фёдор Михайлович Достоевский

City

Kyoto

Japan

Kyoto

Japan

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

6 / 46

Estimate Complexityreasoning

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

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Mistral Small 4

Mistral · Mar 2026text

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

Try this prompt

Vote

2 / 46

AI Board Game Logicreasoning

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

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Mistral Small 4

Mistral · Mar 2026svg

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

Try this prompt

Vote

3 / 46

Logic Puzzlereasoning

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

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Mistral Small 4

Mistral · Mar 2026text

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

Try this prompt

Vote

4 / 46

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-4o (Omni)

Openai · May 2024text

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

Try this prompt

Mistral Small 4

Mistral · Mar 2026text

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

Try this prompt

Vote

5 / 46

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Mistral Small 4

Mistral · Mar 2026svg

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

Try this prompt

Vote

6 / 46

Xbox Controller SVG Artimage generation

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

GPT-4o (Omni)

Openai · May 2024svg

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

Try this prompt

Mistral Small 4

Mistral · Mar 2026svg

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

Try this prompt

Vote

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Our Verdict

GPT-4o (Omni)

Mistral Small 4

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

Mistral Small 4 is 17x cheaper per token — worth considering if cost matters.

Too close to call

These are our prompts. Yours will tell you more.

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

Test with your prompt

FAQ

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GPT-4o (Omni) vs Mistral Small 4

Which is better, GPT-4o (Omni) or Mistral Small 4?