Grok 4.1 Fast vs MoonshotAI: Kimi K2 0905

Compare Grok 4.1 Fast by xAI against MoonshotAI: Kimi K2 0905 by Moonshot AI, tested across 55 shared challenges. Updated April 2026.

Which is better, Grok 4.1 Fast or MoonshotAI: Kimi K2 0905?

Grok 4.1 Fast and MoonshotAI: Kimi K2 0905 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Grok 4.1 Fast and MoonshotAI: Kimi K2 0905

Grok 4.1 Fast is made by xai while MoonshotAI: Kimi K2 0905 is from moonshotai.

Our Verdict
Grok 4.1 Fast
Grok 4.1 Fast
MoonshotAI: Kimi K2 0905
MoonshotAI: Kimi K2 0905Runner-up

No community votes yet. On paper, Grok 4.1 Fast has the edge — newer, major provider backing.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

MoonshotAI: Kimi K2 0905 uses 14.6x more emoji

Grok 4.1 Fast
MoonshotAI: Kimi K2 0905
67%Vocabulary62%
15wSentence Length19w
0.17Hedging0.17
4.7Bold3.3
3.7Lists3.4
0.00Emoji0.15
0.99Headings0.83
0.14Transitions0.06
Based on 24 + 22 text responses
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Grok 4.1 FastMoonshotAI: Kimi K2 0905

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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