Mercury 2.5 Preview vs 
Quasar Alpha
Quasar Alpha has a larger context window than Mercury 2.5 Preview (1.0M tokens vs 260K 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
Not enough votes to call it. On the specs, Quasar Alpha has the edge: bigger model tier, bigger context window.
| Spec | Mercury 2.5 Preview | Quasar Alpha |
|---|---|---|
| Input price | $0.04/M tokens | — |
| Output price | $0.15/M tokens | — |
| Context window | 260K tokens | 1.0M tokens |
| Free API (OpenRouter) | No | — |
| Released | Aug 2026 | Apr 2025 |
| At 10M a month | $0.40 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Mercury 2.5 Preview1 host
Quasar Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.
Common questions
What is the difference between Mercury 2.5 Preview and Quasar Alpha?
Mercury 2.5 Preview is developed by Inception while Quasar Alpha is developed by OpenRouter. Mercury 2.5 Preview has a 260K token context window vs Quasar Alpha's 1.0M. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.
Which is better, Mercury 2.5 Preview or Quasar Alpha?
It depends on your use case. Mercury 2.5 Preview 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 Mercury 2.5 Preview and Quasar Alpha on Rival?
This page shows a side-by-side comparison of Mercury 2.5 Preview 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.
More comparisons
Against the newest arrivals
- Mercury 2.5 Preview vs Gemini 4 ArgonLanded Oct 2026
- Quasar Alpha vs Muse WonderLanded Oct 2026
- Mercury 2.5 Preview vs GPT-4 TurboLanded Oct 2026
- Quasar Alpha vs Step 5 PreviewLanded Oct 2026
- Mercury 2.5 Preview vs Claude Haiku 5.5Landed Oct 2026
- Quasar Alpha vs Ling 3.1 FlashLanded Oct 2026
- Mercury 2.5 Preview vs Mistral Large 4Landed Oct 2026
- Quasar Alpha vs GPT-6.1 SolLanded Sep 2026
Same lab, same size, long tail
- Mercury 2.5 Preview vs Mercury 2.5Same lab
- Mercury 2.5 Preview vs MercurySame lab
- Quasar Alpha vs Ox AlphaSame lab
- Quasar Alpha vs OpenRouter Fusion · Budget (Jun 2026)Same lab
- Quasar Alpha vs Laguna XS 2.1 (free)Same size
- Quasar Alpha vs LFM2.5-2.6BNew provider
- Quasar Alpha vs Ling 2.6 1TNew provider
- Quasar Alpha vs Ling 2.6 FlashSame size
