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

GPT-4o (Omni) is developed by OpenAI while Horizon Alpha is developed by OpenRouter. GPT-4o (Omni) has a 128K token context window vs Horizon Alpha's 256K. You can compare their actual outputs across 34 challenges on Rival to see how they differ in practice.

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

It depends on your use case. GPT-4o (Omni) and Horizon Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 34 challenges so you can judge which fits your needs best.

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

GPT-4o (Omni) costs $2.5/M input tokens and Horizon Alpha costs $0/M input tokens. Horizon Alpha is $2.50/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-4o (Omni) and Horizon Alpha on Rival?

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

GPT-4o (Omni)vsHorizon Alpha

Horizon Alpha is cheaper than GPT-4o (Omni) at $0/M vs $2.5/M input tokens.

GPT-4o (Omni) and Horizon Alpha compared across 34 shared prompts
Spec	GPT-4o (Omni)	Horizon Alpha
Input price	$2.5/M tokens	Free
Output price	$10/M tokens	Free
Context window	128K tokens	256K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	May 2024	Jul 2025