GPT-5.1 vs GPT OSS 120B
Compare GPT-5.1 and GPT OSS 120B, both from OpenAI, context windows of 400K vs 131K, tested across 52 shared challenges.
Our Verdict
GPT-5.1
GPT OSS 120BRunner-up
No community votes yet. On paper, GPT-5.1 has the edge — newer, bigger context window.
GPT OSS 120B is 13x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1
Input
$1.25
Output
$10.00
GPT OSS 120B
Input
$0.18
6.9× cheaper
Output
$0.80
13× cheaper
GPT OSS 120B is cheaper on both — 6.9× input, 13× output
Writing DNA
Style Comparison
Similarity
39%
GPT OSS 120B uses 15.4x more emoji
GPT-5.1
GPT OSS 120B
62%Vocabulary52%
19wSentence Length19w
0.29Hedging0.28
3.5Bold7.4
7.2Lists1.8
0.00Emoji0.15
0.61Headings0.73
0.03Transitions0.17
Based on 14 + 21 text responses
Research
What we learned reading every model
FAQ
Common questions
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