Quasar Alpha vs 
Solar Pro 4
Quasar Alpha has a larger context window than Solar Pro 4 (1.0M tokens vs 524K tokens).
Minimalist Landing Page
Whole landing page for a startup that reads your face. It renders or it doesn't.
Loading the build
Loading the build
Which answer wins?
Price and specs
| Spec | Quasar Alpha | Solar Pro 4 |
|---|---|---|
| Input price | — | $0.09/M tokens |
| Output price | — | $0.36/M tokens |
| Context window | 1.0M tokens | 524K tokens |
| Free API (OpenRouter) | — | No |
| Released | Apr 2025 | Aug 2026 |
| At 10M a month | not listed | $0.90 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Quasar Alpha
No hosts listed on OpenRouter.
Solar Pro 41 host
Per million tokens. Prices and uptime via OpenRouter, checked 28 Sep 2026.
Common questions
What is the difference between Quasar Alpha and Solar Pro 4?
Quasar Alpha is developed by OpenRouter while Solar Pro 4 is developed by Upstage. Quasar Alpha has a 1.0M token context window vs Solar Pro 4's 524K. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.
Which is better, Quasar Alpha or Solar Pro 4?
It depends on your use case. Quasar Alpha and Solar Pro 4 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 Quasar Alpha and Solar Pro 4 on Rival?
This page shows a side-by-side comparison of Quasar Alpha and Solar Pro 4 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.
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Same lab, same size, long tail
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