GPT-5.6 Sol vs Kimi K2.5
Compare GPT-5.6 Sol by OpenAI against Kimi K2.5 by Moonshot AI, context windows of 1.1M vs 262K, tested across 54 shared challenges.
Our Verdict
GPT-5.6 Sol
Kimi K2.5Runner-up
No community votes yet. On paper, GPT-5.6 Sol has the edge — bigger model tier, newer, bigger context window, major provider backing.
Kimi K2.5 is 10x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.6 Sol
Input
$5.00
Output
$30.00
Kimi K2.5
Input
$0.60
8.3× cheaper
Output
$3.00
10× cheaper
Kimi K2.5 is cheaper on both — 8.3× input, 10× output
Writing DNA
Style Comparison
Similarity
48%
GPT-5.6 Sol uses 3.3x more emoji
GPT-5.6 Sol
Kimi K2.5
63%Vocabulary61%
15wSentence Length21w
0.79Hedging0.55
3.4Bold4.9
3.8Lists2.8
0.03Emoji0.01
0.95Headings0.56
0.08Transitions0.17
Based on 27 + 20 text responses
Research
What we learned reading every model
FAQ
Common questions
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