GPT-5 Pro vs GPT OSS 120B
Compare GPT-5 Pro and GPT OSS 120B, both from OpenAI, context windows of 400K vs 131K, tested across 42 shared challenges.
Our Verdict
GPT-5 Pro
GPT OSS 120BRunner-up
No community votes yet. On paper, GPT-5 Pro has the edge — newer, bigger context window.
GPT OSS 120B is 150x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5 Pro
Input
$15.00
Output
$120.00
GPT OSS 120B
Input
$0.18
83× cheaper
Output
$0.80
150× cheaper
GPT OSS 120B is cheaper on both — 83× input, 150× output
Writing DNA
Style Comparison
Similarity
39%
GPT OSS 120B uses 743.4x more bold
GPT-5 Pro
GPT OSS 120B
65%Vocabulary52%
15wSentence Length19w
0.32Hedging0.28
0.0Bold7.4
2.9Lists1.8
0.00Emoji0.15
0.00Headings0.73
0.01Transitions0.17
Based on 11 + 21 text responses
Research
What we learned reading every model
FAQ
Common questions
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