GPT-5.6 Luna vs GPT OSS 120B
Compare GPT-5.6 Luna and GPT OSS 120B, both from OpenAI, context windows of 1.1M vs 131K, tested across 53 shared challenges.
Our Verdict
GPT-5.6 Luna
GPT OSS 120B
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT OSS 120B is 7.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.6 Luna
Input
$1.00
Output
$6.00
GPT OSS 120B
Input
$0.18
5.6× cheaper
Output
$0.80
7.5× cheaper
GPT OSS 120B is cheaper on both — 5.6× input, 7.5× output
Writing DNA
Style Comparison
Similarity
38%
GPT OSS 120B uses 15.4x more emoji
GPT-5.6 Luna
GPT OSS 120B
59%Vocabulary52%
19wSentence Length19w
0.84Hedging0.28
2.7Bold7.4
4.5Lists1.8
0.00Emoji0.15
1.20Headings0.73
0.10Transitions0.17
Based on 27 + 21 text responses
Research
What we learned reading every model
FAQ
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