What is the difference between GPT-4o (Omni) and GPT-5?

Both are developed by OpenAI but target different use cases. GPT-4o (Omni) has a 128K token context window vs GPT-5's 400K. You can compare their actual outputs across 52 challenges on Rival to see how they differ in practice.

Which is better, GPT-4o (Omni) or GPT-5?

It depends on your use case. GPT-4o (Omni) and GPT-5 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-4o (Omni) cost compared to GPT-5?

GPT-4o (Omni) costs $2.5/M input tokens and GPT-5 costs $1.25/M input tokens. GPT-5 is $1.25/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-4o (Omni) and GPT-5 on Rival?

This page shows a side-by-side comparison of GPT-4o (Omni) and GPT-5 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-4o (Omni)vsGPT-5

GPT-5 is cheaper than GPT-4o (Omni) at $1.25/M vs $2.5/M input tokens.

GPT-4o (Omni) and GPT-5 compared across 52 shared prompts
Spec	GPT-4o (Omni)	GPT-5
Input price	$2.5/M tokens	$1.25/M tokens
Output price	$10/M tokens	$10/M tokens
Context window	128K tokens	400K tokens
Parameters	Not disclosed	Not disclosed
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2024	Aug 2025