What is the difference between GPT-5 and o3 Mini?

Both are developed by OpenAI but target different use cases. GPT-5 has a 400K token context window vs o3 Mini's 64K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 or o3 Mini?

It depends on your use case. GPT-5 and o3 Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 52 challenges so you can judge which fits your needs best.

How much does GPT-5 cost compared to o3 Mini?

GPT-5 costs $1.25/M input tokens and o3 Mini costs $1.1/M input tokens. o3 Mini is $0.15/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 and o3 Mini on Rival?

This page shows a side-by-side comparison of GPT-5 and o3 Mini across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Aug 2025

GPT-5vso3 Mini

o3 Mini is cheaper than GPT-5 at $1.1/M vs $1.25/M input tokens.

GPT-5 and o3 Mini compared across 52 shared prompts
Spec	GPT-5	o3 Mini
Input price	$1.25/M tokens	$1.1/M tokens
Output price	$10/M tokens	$4.4/M tokens
Context window	400K tokens	64K tokens
Parameters	Not disclosed	Not disclosed
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Aug 2025	Dec 2024