Gemini 1.5 ProvsGrok 4.1 Fast
Grok 4.1 Fast is the newer model, released after Gemini 1.5 Pro.
| Spec | Gemini 1.5 Pro | Grok 4.1 Fast |
|---|---|---|
| Input price | $3.5/M tokens | — |
| Output price | $10.5/M tokens | — |
| Context window | 1.0M tokens | — |
| Free API (OpenRouter) | No | No |
| Released | Feb 2024 | Nov 2025 |
Our Verdict
Grok 4.1 Fast
Gemini 1.5 ProRunner-up
Not enough votes to call it. On the specs, Grok 4.1 Fast has the edge: bigger model tier, newer.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
Gemini 1.5 Pro
Input
$3.50
Output
$10.50
Grok 4.1 Fast
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
32%
Grok 4.1 Fast uses 97.0x more emoji
Gemini 1.5 Pro
Grok 4.1 Fast
61%Vocabulary69%
15wSentence Length15w
0.80Hedging0.20
3.7Bold4.3
3.3Lists3.6
0.00Emoji0.97
0.08Headings0.90
0.09Transitions0.12
Based on 8 + 28 text responses
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