Aurora AlphavsMercury 2.5 Preview
Aurora Alpha is cheaper than Mercury 2.5 Preview at $0/M vs $0.04/M input tokens.
| Spec | Aurora Alpha | Mercury 2.5 Preview |
|---|---|---|
| Input price | Free | $0.04/M tokens |
| Output price | Free | $0.15/M tokens |
| Context window | 128K tokens | 260K tokens |
| Free API (OpenRouter) | No | No |
| Released | Feb 2026 | Aug 2026 |
Our Verdict
Aurora Alpha
Mercury 2.5 Preview
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
Aurora Alpha
Input
$0.000
Output
$0.000
Mercury 2.5 Preview
Input
$0.04
Output
$0.15
Where to run it
1 host
Aurora Alpha
No hosts listed on OpenRouter.
Mercury 2.5 Preview1 host
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
33%
Aurora Alpha uses 10.0x more emoji
Aurora Alpha
Mercury 2.5 Preview
52%Vocabulary65%
21wSentence Length14w
0.43Hedging0.44
6.3Bold4.9
2.2Lists3.3
0.10Emoji0.00
0.69Headings0.79
0.16Transitions0.20
Based on 22 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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