xAI: Grok 4.5 vs Kimi K2.5
Compare xAI: Grok 4.5 by xAI against Kimi K2.5 by Moonshot AI, context windows of 500K vs 262K, tested across 54 shared challenges.
Our Verdict
xAI: Grok 4.5
Kimi K2.5Runner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window, major provider backing.
Too close to call
API pricing
Cost per 1M tokens
xAI: Grok 4.5
Input
$2.00
Output
$6.00
Kimi K2.5
Input
$0.60
3.3× cheaper
Output
$3.00
2.0× cheaper
Kimi K2.5 is cheaper on both — 3.3× input, 2.0× output
Writing DNA
Style Comparison
Similarity
61%
xAI: Grok 4.5 uses 9.0x more emoji
xAI: Grok 4.5
Kimi K2.5
61%Vocabulary61%
16wSentence Length21w
0.23Hedging0.55
2.5Bold4.9
2.4Lists2.8
0.09Emoji0.01
0.48Headings0.56
0.06Transitions0.17
Based on 27 + 20 text responses
Research
What we learned reading every model
FAQ
