What is the difference between GPT-5.4 Mini and OpenAI o3?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 50 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.4 Mini or OpenAI o3?

It depends on your use case. GPT-5.4 Mini and OpenAI o3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 50 challenges so you can judge which fits your needs best.

How much does GPT-5.4 Mini cost compared to OpenAI o3?

GPT-5.4 Mini costs $0.75/M input tokens and OpenAI o3 costs $10/M input tokens. GPT-5.4 Mini is $9.25/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 OpenAI o3 on Rival?

This page shows a side-by-side comparison of GPT-5.4 Mini and OpenAI o3 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 MinivsOpenAI o3

45 fights queued

Why GPT-5.4 Mini?

9.3x cheaper overall$0.75/M in · $4.50/M out

11 months newerMar 2026

Why OpenAI o3?

Dead even. This one's a coin flip.

GPT-5.4 MiniOpenAI o3

Input price

$0.75/M

$10.00/M

Output price

$4.50/M

$40.00/M

Context

400K

—

Released

Mar 2026

Apr 2025

Favorites

GPT-5.4 MiniOpenAI o3

Movie

The Godfather

19728.7

Blade Runner

19827.9

Album

Kid A

Radiohead

—

Book

Pride and Prejudice

Jane Austen

—

City

Kyoto

Japan

Kyoto

Japan

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

—

6 / 45

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

OpenAI o3

Openai · Apr 2025text

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

Try this prompt

Vote

2 / 45

AI Board Game Logicreasoning

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

GPT-5.4 Mini

Openai · Mar 2026svg

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

Try this prompt

OpenAI o3

Openai · Apr 2025svg

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

Try this prompt

Vote

3 / 45

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

OpenAI o3

Openai · Apr 2025text

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

Try this prompt

Vote

4 / 45

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

OpenAI o3

Openai · Apr 2025text

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

Try this prompt

Vote

5 / 45

SVG Layout Challengeimage generation

Tests an AI's ability to generate vector graphics

GPT-5.4 Mini

Openai · Mar 2026svg

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

Try this prompt

OpenAI o3

Openai · Apr 2025svg

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

Try this prompt

Vote

6 / 45

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

OpenAI o3

Openai · Apr 2025svg

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

OpenAI o3

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 8.9x 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 OpenAI o3 on your actual task. 5 free credits. No card.

Test with your prompt

FAQ

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GPT-5.4 Mini vs OpenAI o3

Which is better, GPT-5.4 Mini or OpenAI o3?