OpenAI: GPT-5.6 Sol vs Kimi K2
Compare OpenAI: GPT-5.6 Sol by OpenAI against Kimi K2 by Moonshot AI, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Sol
Kimi K2Runner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Sol has the edge — newer, bigger context window, major provider backing.
Kimi K2 is 13x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
OpenAI: GPT-5.6 Sol
Input
$5.00
Output
$30.00
Kimi K2
Input
$0.57
8.8× cheaper
Output
$2.30
13× cheaper
Kimi K2 is cheaper on both — 8.8× input, 13× output
Writing DNA
Style Comparison
Similarity
50%
Kimi K2 uses 20.8x more emoji
OpenAI: GPT-5.6 Sol
Kimi K2
63%Vocabulary63%
15wSentence Length19w
0.79Hedging0.35
3.4Bold4.2
3.8Lists3.6
0.03Emoji0.68
0.95Headings0.61
0.08Transitions0.06
Based on 27 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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