GPT-5.6 Sol vs Kimi K2 Thinking
Compare GPT-5.6 Sol by OpenAI against Kimi K2 Thinking by Moonshot AI, context windows of 1.1M vs 262K, tested across 54 shared challenges.
Our Verdict
GPT-5.6 Sol
Kimi K2 ThinkingRunner-up
No community votes yet. On paper, GPT-5.6 Sol has the edge — newer, bigger context window, major provider backing.
Kimi K2 Thinking is 12x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.6 Sol
Input
$5.00
Output
$30.00
Kimi K2 Thinking
Input
$0.60
8.3× cheaper
Output
$2.50
12× cheaper
Kimi K2 Thinking is cheaper on both — 8.3× input, 12× output
Writing DNA
Style Comparison
Similarity
44%
GPT-5.6 Sol uses 3.3x more emoji
GPT-5.6 Sol
Kimi K2 Thinking
63%Vocabulary57%
15wSentence Length26w
0.79Hedging0.36
3.4Bold5.8
3.8Lists6.0
0.03Emoji0.00
0.95Headings0.56
0.08Transitions0.06
Based on 27 + 14 text responses
Research
What we learned reading every model
FAQ
