What is the difference between Grok 4 and Optimus Alpha?

Grok 4 is developed by xAI while Optimus Alpha is developed by OpenRouter. Grok 4 has a 256K token context window vs Optimus Alpha's 1.0M. You can compare their actual outputs across 17 challenges on Rival to see how they differ in practice.

Which is better, Grok 4 or Optimus Alpha?

It depends on your use case. Grok 4 and Optimus Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 17 challenges so you can judge which fits your needs best.

How can I compare Grok 4 and Optimus Alpha on Rival?

This page shows a side-by-side comparison of Grok 4 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 Jul 2025

Grok 4vsOptimus Alpha

Optimus Alpha has a larger context window than Grok 4 (1.0M tokens vs 256K tokens).

Grok 4 and Optimus Alpha compared across 17 shared prompts
Spec	Grok 4	Optimus Alpha
Input price	$3/M tokens	—
Output price	$15/M tokens	—
Context window	256K tokens	1.0M tokens
Parameters	Not disclosed	Not disclosed
Free API (OpenRouter)	No	—
Released	Jul 2025	Apr 2025