GPT-5.5 vs GPT OSS 20B
Compare GPT-5.5 and GPT OSS 20B, both from OpenAI, context windows of 1.1M vs 131K, tested across 53 shared challenges.
Our Verdict
GPT-5.5
GPT OSS 20BRunner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier, newer, bigger context window.
GPT OSS 20B is 300x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.5
Input
$5.00
Output
$30.00
GPT OSS 20B
Input
$0.02
250× cheaper
Output
$0.10
300× cheaper
GPT OSS 20B is cheaper on both — 250× input, 300× output
Writing DNA
Style Comparison
Similarity
42%
GPT OSS 20B uses 10.2x more emoji
GPT-5.5
GPT OSS 20B
58%Vocabulary54%
18wSentence Length17w
0.74Hedging0.26
2.9Bold5.9
5.1Lists3.3
0.00Emoji0.10
1.68Headings0.75
0.03Transitions0.32
Based on 26 + 21 text responses
Research
What we learned reading every model
FAQ
Common questions
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