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  5. Bert-Nebulon AlphavsMercury 2.5 Preview
Updated Aug 2026

Bert-Nebulon AlphavsMercury 2.5 Preview

Mercury 2.5 Preview is the newer model, released after Bert-Nebulon Alpha.

Bert-Nebulon Alpha and Mercury 2.5 Preview compared across 34 shared prompts
SpecBert-Nebulon AlphaMercury 2.5 Preview
Input price—$0.04/M tokens
Output price—$0.15/M tokens
Context window—260K tokens
Free API (OpenRouter)NoNo
ReleasedNov 2025Aug 2026
Our Verdict
Bert-Nebulon Alpha
Bert-Nebulon Alpha
Mercury 2.5 Preview
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

Bert-Nebulon Alpha
Input
—
Output
—
Mercury 2.5 Preview
Input
$0.04
Output
$0.15
Where to run it

1 host

Bert-Nebulon Alpha

No hosts listed on OpenRouter.

Mercury 2.5 Preview1 host
HostInOutContextUptime
Inception$0.04 in·$0.15 out·260k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.

Writing DNA

Style Comparison

Similarity
31%

Bert-Nebulon Alpha uses 42.4x more emoji

Bert-Nebulon Alpha
Mercury 2.5 Preview
55%Vocabulary65%
21wSentence Length14w
0.28Hedging0.44
10.9Bold4.9
5.7Lists3.3
0.42Emoji0.00
1.40Headings0.79
0.04Transitions0.20
Based on 14 + 26 text responses
Research

What we learned reading every model

FAQ

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