What is the difference between OpenAI o3 and Quasar Alpha?

OpenAI o3 is developed by OpenAI while Quasar Alpha is developed by OpenRouter. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, OpenAI o3 or Quasar Alpha?

It depends on your use case. OpenAI o3 and Quasar Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How can I compare OpenAI o3 and Quasar Alpha on Rival?

This page shows a side-by-side comparison of OpenAI o3 and Quasar 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

OpenAI o3vsQuasar Alpha

OpenAI o3 is the newer model, released after Quasar Alpha.

OpenAI o3 and Quasar Alpha compared across 6 shared prompts
Spec	OpenAI o3	Quasar Alpha
Input price	$10/M tokens	—
Output price	$40/M tokens	—
Context window	—	1.0M tokens
Parameters	Not disclosed	Not disclosed
Weights	Closed	—
Free API (OpenRouter)	No	—
Released	Apr 2025	Apr 2025

Our Verdict

OpenAI o3

Quasar AlphaRunner-up

Not enough votes to call it. On the specs, OpenAI o3 has the edge: bigger model tier, major provider backing.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

OpenAI o3

Input

$10.00

Output

$40.00

Quasar Alpha

Input

—

Output

—

Where to run it

1 host

OpenAI o31 host

HostInOutContextUptime

OpenAI$2.00 in$8.00 out200k100% up

Quasar Alpha

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between OpenAI o3 and Quasar Alpha?

Which is better, OpenAI o3 or Quasar Alpha?

How can I compare OpenAI o3 and Quasar Alpha on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

1 host

What we learned reading every model

Common questions

What is the difference between OpenAI o3 and Quasar Alpha?

Which is better, OpenAI o3 or Quasar Alpha?

How can I compare OpenAI o3 and Quasar Alpha on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages