What is the difference between GPT-5 Codex and GPT-5.4 Nano?

Both are developed by OpenAI but target different use cases. 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 GPT-5.4 Nano?

It depends on your use case. GPT-5 Codex and GPT-5.4 Nano 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 GPT-5.4 Nano on Rival?

This page shows a side-by-side comparison of GPT-5 Codex and GPT-5.4 Nano 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 CodexvsGPT-5.4 Nano

44 fights queued

Why GPT-5 Codex?

Dead even. This one's a coin flip.

Why GPT-5.4 Nano?

6 months newerMar 2026

GPT-5 CodexGPT-5.4 Nano

Input price

—

$0.20/M

Output price

—

$1.25/M

Context

—

400K

Released

Sep 2025

Mar 2026

Favorites

GPT-5 CodexGPT-5.4 Nano

Movie

Blade Runner

19827.9

The Matrix

19998.2

Album

Kind of Blue

Miles Davis

To Pimp a Butterfly

Kendrick Lamar

Book

—

To Kill a Mockingbird

Harper Lee

City

Tokyo

Japan

Tokyo

Japan

Game

Minecraft

Action, Arcade4.4

The Legend of Zelda: Ocarina of Time

Adventure, Action4.4

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

GPT-5.4 Nano

Openai · 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

GPT-5.4 Nano

Openai · 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

GPT-5.4 Nano

Openai · 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

GPT-5.4 Nano

Openai · 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

GPT-5.4 Nano

Openai · 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

GPT-5.4 Nano

Openai · 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-5 Codex

GPT-5.4 Nano

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

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GPT-5 Codex vs GPT-5.4 Nano

Which is better, GPT-5 Codex or GPT-5.4 Nano?