Grok 4.1 FastvsMiMo-V2.5
MiMo-V2.5 is the newer model, released after Grok 4.1 Fast.
| Spec | Grok 4.1 Fast | MiMo-V2.5 |
|---|---|---|
| Input price | — | $0.4/M tokens |
| Output price | — | $2/M tokens |
| Context window | — | 1.0M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Nov 2025 | Apr 2026 |
Our Verdict
Grok 4.1 Fast
MiMo-V2.5Runner-up
Not enough votes to call it. On the specs, Grok 4.1 Fast has the edge: bigger model tier, major provider backing.
Too close to call
API pricing
Cost per 1M tokens
Grok 4.1 Fast
Input
—
Output
—
MiMo-V2.5
Input
$0.40
Output
$2.00
Where to run it
5 hosts, cheapest first
Grok 4.1 Fast
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 8 Sep 2026.
Writing DNA
Style Comparison
Similarity
48%
MiMo-V2.5 uses 3.3x more hedging
Grok 4.1 Fast
MiMo-V2.5
69%Vocabulary57%
15wSentence Length17w
0.20Hedging0.64
4.3Bold5.9
3.6Lists2.8
0.97Emoji1.01
0.90Headings1.07
0.12Transitions0.07
Based on 28 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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