What is the difference between GPT-5.4 Mini and Gemini 2.5 Pro (I/O Edition)?

GPT-5.4 Mini is developed by OpenAI while Gemini 2.5 Pro (I/O Edition) is developed by Google AI. You can compare their actual outputs across 34 challenges on Rival to see how they differ in practice.

Which is better, GPT-5.4 Mini or Gemini 2.5 Pro (I/O Edition)?

It depends on your use case. GPT-5.4 Mini and Gemini 2.5 Pro (I/O Edition) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 34 challenges so you can judge which fits your needs best.

How much does GPT-5.4 Mini cost compared to Gemini 2.5 Pro (I/O Edition)?

GPT-5.4 Mini costs $0.75/M input tokens and Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens. GPT-5.4 Mini is $0.50/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 Gemini 2.5 Pro (I/O Edition) on Rival?

This page shows a side-by-side comparison of GPT-5.4 Mini and Gemini 2.5 Pro (I/O Edition) 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 MinivsGemini 2.5 Pro (I/O Edition)

34 fights queued

Why GPT-5.4 Mini?

2.2x cheaper overall$0.75/M in · $4.50/M out

11 months newerMar 2026

Why Gemini 2.5 Pro (I/O Edition)?

Dead even. This one's a coin flip.

GPT-5.4 MiniGemini 2.5 Pro (I/O Edition)

Input price

$0.75/M

$1.25/M

Output price

$4.50/M

$10.00/M

Context

400K

—

Released

Mar 2026

May 2025

Favorites

GPT-5.4 MiniGemini 2.5 Pro (I/O Edition)

Movie

The Godfather

19728.7

2001

Album

Kid A

Radiohead

The Dark

Metal Church

Book

Pride and Prejudice

Jane Austen

The Hitch Hiker's Guide to the Galaxy

Douglas Adams

City

Kyoto

Japan

Kyoto

Japan

Game

The Legend of Zelda: Breath of the Wild

Adventure, Action4.5

CHRONO

Casual, Indie

6 / 34

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

Gemini 2.5 Pro (I/O Edition)

Google · May 2025text

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

Try this prompt

Vote

2 / 34

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

Gemini 2.5 Pro (I/O Edition)

Google · May 2025text

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

Try this prompt

Vote

3 / 34

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

Gemini 2.5 Pro (I/O Edition)

Google · May 2025text

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

Try this prompt

Vote

4 / 34

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

Gemini 2.5 Pro (I/O Edition)

Google · May 2025svg

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

Try this prompt

Vote

5 / 34

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

Gemini 2.5 Pro (I/O Edition)

Google · May 2025svg

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

Try this prompt

Vote

6 / 34

Generate a Stand-Up Routineconversation

Tests an AI's humor and creative writing ability

GPT-5.4 Mini

Openai · Mar 2026text

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

Try this prompt

Gemini 2.5 Pro (I/O Edition)

Google · May 2025text

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

Gemini 2.5 Pro (I/O Edition)

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 GPT-5.4 Mini vs Gemini 2.5 Pro (I/O Edition) on your actual task. 5 free credits. No card.

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FAQ

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GPT-5.4 Mini vs Gemini 2.5 Pro (I/O Edition)

Which is better, GPT-5.4 Mini or Gemini 2.5 Pro (I/O Edition)?