What is the difference between GPT-5 Codex and Mistral Small 4?

GPT-5 Codex is developed by OpenAI while Mistral Small 4 is developed by Mistral AI. You can compare their actual outputs across 49 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Codex or Mistral Small 4?

It depends on your use case. GPT-5 Codex and Mistral Small 4 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 49 challenges so you can judge which fits your needs best.

How can I compare GPT-5 Codex and Mistral Small 4 on Rival?

This page shows a side-by-side comparison of GPT-5 Codex 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-5 CodexvsMistral Small 4

44 fights queued

Why GPT-5 Codex?

Dead even. This one's a coin flip.

Why Mistral Small 4?

6 months newerMar 2026

Favorites

GPT-5 CodexMistral Small 4

Movie

Blade Runner

19827.9

The Dark Knight

20088.5

Album

Kind of Blue

Miles Davis

OK Computer

Radiohead

Book

—

Братья Карамазовы

Фёдор Михайлович Достоевский

City

Tokyo

Japan

Kyoto

Japan

Game

Minecraft

Action, Arcade4.4

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

6 / 44

Estimate Complexityreasoning

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

GPT-5 Codex

Openai · Sep 2025text

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 / 44

AI Board Game Logicreasoning

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

GPT-5 Codex

Openai · Sep 2025svg

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 / 44

Logic Puzzlereasoning

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

GPT-5 Codex

Openai · Sep 2025text

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 / 44

Stochastic Consistency Testanalysis

Tests an AI's randomness and creativity

GPT-5 Codex

Openai · Sep 2025text

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 / 44

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5 Codex

Openai · Sep 2025svg

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 / 44

Xbox Controller SVG Artimage generation

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

GPT-5 Codex

Openai · Sep 2025svg

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

This matchup has more rounds

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Our Verdict

GPT-5 Codex

Mistral Small 4Runner-up

No community votes yet. On paper, GPT-5 Codex has the edge — bigger model tier, major provider backing.

Too close to call

These are our prompts. Yours will tell you more.

Run GPT-5 Codex vs Mistral Small 4 on your actual task. 5 free credits. No card.

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FAQ

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GPT-5 Codex vs Mistral Small 4

Which is better, GPT-5 Codex or Mistral Small 4?