GPT-5.2 Pro vs GPT OSS 120B
Compare GPT-5.2 Pro and GPT OSS 120B, both from OpenAI, context windows of 400K vs 131K, tested across 31 shared challenges.
Our Verdict
GPT-5.2 Pro
GPT OSS 120BRunner-up
No community votes yet. On paper, GPT-5.2 Pro has the edge — newer, bigger context window.
GPT OSS 120B is 210x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.2 Pro
Input
$21.00
Output
$168.00
GPT OSS 120B
Input
$0.18
117× cheaper
Output
$0.80
210× cheaper
GPT OSS 120B is cheaper on both — 117× input, 210× output
Writing DNA
Style Comparison
Similarity
62%
GPT OSS 120B uses 15.4x more emoji
GPT-5.2 Pro
GPT OSS 120B
62%Vocabulary52%
19wSentence Length19w
0.39Hedging0.28
8.6Bold7.4
3.8Lists1.8
0.00Emoji0.15
1.17Headings0.73
0.02Transitions0.17
Based on 10 + 21 text responses
Research
What we learned reading every model
FAQ
Common questions
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