Claude Opus 4vsSonoma Sky Alpha
Sonoma Sky Alpha is cheaper than Claude Opus 4 at $0/M vs $15/M input tokens.
| Spec | Claude Opus 4 | Sonoma Sky Alpha |
|---|---|---|
| Input price | $15/M tokens | Free |
| Output price | $75/M tokens | Free |
| Context window | 200K tokens | 2.0M tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Sep 2025 |
Our Verdict
Claude Opus 4
Sonoma Sky Alpha
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
Sonoma Sky Alpha
Input
$0.000
Output
$0.000
Where to run it
1 host
Claude Opus 41 host
Sonoma Sky Alpha
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
47%
Claude Opus 4 uses 9.3x more emoji
Claude Opus 4
Sonoma Sky Alpha
65%Vocabulary62%
57wSentence Length16w
0.67Hedging0.41
3.8Bold1.6
6.8Lists2.8
1.18Emoji0.13
1.42Headings1.42
0.22Transitions0.06
Based on 27 + 14 text responses
Research
What we learned reading every model
FAQ
Common questions
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