DeepSeek R1 0528vsGrok 4.1 Fast
Grok 4.1 Fast is the newer model, released after DeepSeek R1 0528.
| Spec | DeepSeek R1 0528 | Grok 4.1 Fast |
|---|---|---|
| Input price | Free | — |
| Output price | Free | — |
| Context window | 164K tokens | — |
| Weights | Open | — |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Nov 2025 |
Our Verdict
DeepSeek R1 0528
Grok 4.1 Fast
Not enough votes to call it. On the specs, nothing separates them.
Too close to call
Reviewing agent-written code?See a Brief PR report
API pricing
Cost per 1M tokens
DeepSeek R1 0528
Input
$0.000
Output
$0.000
Grok 4.1 Fast
Input
—
Output
—
Where to run it
4 hosts, cheapest first
Grok 4.1 Fast
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 11 Sep 2026.
Writing DNA
Style Comparison
Similarity
59%
Grok 4.1 Fast uses 3.6x more headings
DeepSeek R1 0528
Grok 4.1 Fast
59%Vocabulary69%
14wSentence Length15w
0.47Hedging0.20
5.1Bold4.3
3.6Lists3.6
0.82Emoji0.97
0.25Headings0.90
0.24Transitions0.12
Based on 20 + 28 text responses
Research
What we learned reading every model
FAQ
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