Claude Sonnet 4vsMercury
Claude Sonnet 4 is cheaper than Mercury at $3/M vs $10/M input tokens.
| Spec | Claude Sonnet 4 | Mercury |
|---|---|---|
| Input price | $3/M tokens | $10/M tokens |
| Output price | $15/M tokens | $10/M tokens |
| Context window | 200K tokens | 32K tokens |
| Parameters | Not disclosed | Not disclosed |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Jun 2025 |
Our Verdict
Claude Sonnet 4
MercuryRunner-up
Not enough votes to call it. On the specs, Claude Sonnet 4 has the edge: bigger model tier, bigger context window, major provider backing.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
3.3× cheaper
Output
$15.00
Mercury
Input
$10.00
Output
$10.00
1.5× cheaper
Claude Sonnet 4 wins input (3.3× cheaper)·Mercury wins output (1.5× cheaper)
Where to run it
2 hosts
Claude Sonnet 42 hosts
Mercury
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
62%
Claude Sonnet 4 uses 25.2x more emoji
Claude Sonnet 4
Mercury
64%Vocabulary60%
81wSentence Length31w
0.56Hedging0.78
4.5Bold4.1
6.6Lists2.8
0.70Emoji0.03
1.59Headings0.88
0.20Transitions0.06
Based on 28 + 26 text responses
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