What is the difference between GPT-4.5 and GPT-4o (Omni)?

Both are developed by OpenAI but target different use cases. GPT-4.5 has a 128K token context window vs GPT-4o (Omni)'s 128K. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, GPT-4.5 or GPT-4o (Omni)?

It depends on your use case. GPT-4.5 and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How much does GPT-4.5 cost compared to GPT-4o (Omni)?

GPT-4.5 costs $75/M input tokens and GPT-4o (Omni) costs $2.5/M input tokens. GPT-4o (Omni) is $72.50/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-4.5 and GPT-4o (Omni) on Rival?

This page shows a side-by-side comparison of GPT-4.5 and GPT-4o (Omni) 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 Feb 2025

GPT-4.5vsGPT-4o (Omni)

GPT-4o (Omni) is cheaper than GPT-4.5 at $2.5/M vs $75/M input tokens.

GPT-4.5 and GPT-4o (Omni) compared across 25 shared prompts
Spec	GPT-4.5	GPT-4o (Omni)
Input price	$75/M tokens	$2.5/M tokens
Output price	$150/M tokens	$10/M tokens
Context window	128K tokens	128K tokens
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Feb 2025	May 2024
MMLU	90.8%	88.7%