What is the difference between GPT-5 Nano and o1?

Both are developed by OpenAI but target different use cases. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, GPT-5 Nano or o1?

It depends on your use case. GPT-5 Nano and o1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare GPT-5 Nano and o1 on Rival?

This page shows a side-by-side comparison of GPT-5 Nano and o1 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-5 Nanovso1

GPT-5 Nano is the newer model, released after o1.

GPT-5 Nano and o1 compared across 54 shared prompts
Spec	GPT-5 Nano	o1
Input price	—	$15/M tokens
Output price	—	$60/M tokens
Context window	—	128K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Aug 2025	Dec 2024
SWE-bench Verified	54.7%	48.9%