Gemini 2.5 Pro Preview 06-05vsGrok 4 Fast (free)
Grok 4 Fast (free) is cheaper than Gemini 2.5 Pro Preview 06-05 at $0/M vs $1.25/M input tokens.
| Spec | Gemini 2.5 Pro Preview 06-05 | Grok 4 Fast (free) |
|---|---|---|
| Input price | $1.25/M tokens | Free |
| Output price | $10/M tokens | Free |
| Context window | 1.0M tokens | 2.0M tokens |
| Parameters | Not disclosed | Not disclosed |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Jun 2025 | Sep 2025 |
Our Verdict
Gemini 2.5 Pro Preview 06-05
Grok 4 Fast (free)
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Pro Preview 06-05
Input
$1.25
Output
$10.00
Grok 4 Fast (free)
Input
$0.000
Output
$0.000
Where to run it
2 hosts, cheapest first
Gemini 2.5 Pro Preview 06-052 hosts
Grok 4 Fast (free)
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
31%
Grok 4 Fast (free) uses 5.5x more transitions
Gemini 2.5 Pro Preview 06-05
Grok 4 Fast (free)
51%Vocabulary65%
15wSentence Length13w
0.31Hedging0.56
4.8Bold1.4
4.1Lists2.5
0.00Emoji0.00
0.98Headings1.58
0.05Transitions0.28
Based on 20 + 14 text responses
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