Claude Sonnet 4vsGemini 3.1 Pro Preview
Gemini 3.1 Pro Preview is cheaper than Claude Sonnet 4 at $2/M vs $3/M input tokens.
| Spec | Claude Sonnet 4 | Gemini 3.1 Pro Preview |
|---|---|---|
| Input price | $3/M tokens | $2/M tokens |
| Output price | $15/M tokens | $12/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Released | May 2025 | Feb 2026 |
| SWE-bench Verified | 72.7% | 80.6% |
Our Verdict
Gemini 3.1 Pro Preview
Claude Sonnet 4Runner-up
Not enough votes to call it. On the specs, Gemini 3.1 Pro Preview has the edge: bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
Gemini 3.1 Pro Preview
Input
$2.00
1.5× cheaper
Output
$12.00
1.3× cheaper
Gemini 3.1 Pro Preview is cheaper on both — 1.5× input, 1.3× output
Writing DNA
Style Comparison
Similarity
33%
Claude Sonnet 4 uses 87.9x more emoji
Claude Sonnet 4
Gemini 3.1 Pro Preview
62%Vocabulary54%
111wSentence Length18w
0.40Hedging0.29
5.0Bold4.9
9.3Lists3.3
0.88Emoji0.00
2.16Headings0.72
0.33Transitions0.14
Based on 17 + 23 text responses
Research
What we learned reading every model
FAQ
Common questions
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