Mercury 2.5 PreviewvsSonar Pro Search
Mercury 2.5 Preview is cheaper than Sonar Pro Search at $0.04/M vs $3/M input tokens.
| Spec | Mercury 2.5 Preview | Sonar Pro Search |
|---|---|---|
| Input price | $0.04/M tokens | $3/M tokens |
| Output price | $0.15/M tokens | $15/M tokens |
| Context window | 260K tokens | 200K tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | Aug 2026 | Oct 2025 |
Our Verdict
Mercury 2.5 Preview
Sonar Pro Search
Not enough votes to call it. On the specs, nothing separates them.
Mercury 2.5 Preview costs 100x less per token.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Mercury 2.5 Preview
Input
$0.04
75× cheaper
Output
$0.15
100× cheaper
Sonar Pro Search
Input
$3.00
Output
$15.00
Mercury 2.5 Preview is cheaper on both: 75× input, 100× output.
Where to run it
2 hosts
Mercury 2.5 Preview1 host
Sonar Pro Search1 host
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
46%
Mercury 2.5 Preview uses 2.9x more transitions
Mercury 2.5 Preview
Sonar Pro Search
65%Vocabulary60%
14wSentence Length22w
0.44Hedging0.30
4.9Bold2.7
3.3Lists2.6
0.00Emoji0.00
0.79Headings2.08
0.20Transitions0.07
Based on 26 + 25 text responses
Research
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FAQ
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