What is the difference between ChatGPT-4o (March 2025) and Optimus Alpha?

ChatGPT-4o (March 2025) is developed by OpenAI while Optimus Alpha is developed by OpenRouter. ChatGPT-4o (March 2025) has a 128K token context window vs Optimus Alpha's 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, ChatGPT-4o (March 2025) or Optimus Alpha?

It depends on your use case. ChatGPT-4o (March 2025) and Optimus Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How can I compare ChatGPT-4o (March 2025) and Optimus Alpha on Rival?

This page shows a side-by-side comparison of ChatGPT-4o (March 2025) and Optimus Alpha 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 Apr 2025

ChatGPT-4o (March 2025)vsOptimus Alpha

Optimus Alpha has a larger context window than ChatGPT-4o (March 2025) (1.0M tokens vs 128K tokens).

ChatGPT-4o (March 2025) and Optimus Alpha compared across 12 shared prompts
Spec	ChatGPT-4o (March 2025)	Optimus Alpha
Input price	$5/M tokens	—
Output price	$15/M tokens	—
Context window	128K tokens	1.0M tokens
Parameters	Not disclosed	Not disclosed
Free API (OpenRouter)	No	—
Released	Mar 2025	Apr 2025