What is the difference between Andromeda Alpha and GPT-5 Pro?

Andromeda Alpha is developed by OpenRouter while GPT-5 Pro is developed by OpenAI. Andromeda Alpha has a 128K token context window vs GPT-5 Pro's 400K. You can compare their actual outputs across 23 challenges on Rival to see how they differ in practice.

Which is better, Andromeda Alpha or GPT-5 Pro?

It depends on your use case. Andromeda Alpha and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 23 challenges so you can judge which fits your needs best.

How much does Andromeda Alpha cost compared to GPT-5 Pro?

Andromeda Alpha costs $0/M input tokens and GPT-5 Pro costs $15/M input tokens. Andromeda Alpha is $15.00/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 Andromeda Alpha and GPT-5 Pro on Rival?

This page shows a side-by-side comparison of Andromeda Alpha and GPT-5 Pro 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 Oct 2025

Andromeda AlphavsGPT-5 Pro

Andromeda Alpha is cheaper than GPT-5 Pro at $0/M vs $15/M input tokens.

Andromeda Alpha and GPT-5 Pro compared across 23 shared prompts
Spec	Andromeda Alpha	GPT-5 Pro
Input price	Free	$15/M tokens
Output price	Free	$120/M tokens
Context window	128K tokens	400K tokens
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Oct 2025	Oct 2025