Claude Sonnet 4vsGrok 3
Claude Sonnet 4 has a larger context window than Grok 3 (200K tokens vs 128K tokens).
| Spec | Claude Sonnet 4 | Grok 3 |
|---|---|---|
| Input price | $3/M tokens | — |
| Output price | $15/M tokens | — |
| Context window | 200K tokens | 128K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Feb 2025 |
| SWE-bench Verified | 72.7% | 63.8% |
Our Verdict
Claude Sonnet 4
Grok 3Runner-up
Not enough votes to call it. On the specs, Claude Sonnet 4 has the edge: newer, bigger context window.
Pick Claude Sonnet 4 for Image Generation, Reasoning, Analysis. Pick Grok 3 for Web Design.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
Grok 3
Input
—
Output
—
Where to run it
2 hosts
Claude Sonnet 42 hosts
Grok 3
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
30%
Claude Sonnet 4 uses 28.3x more emoji
Claude Sonnet 4
Grok 3
64%Vocabulary54%
81wSentence Length17w
0.56Hedging0.65
4.5Bold2.6
6.6Lists2.3
0.70Emoji0.02
1.59Headings0.48
0.20Transitions0.20
Based on 28 + 27 text responses
Research
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