GPT OSS 20Bvso1
GPT OSS 20B is cheaper than o1 at $0.02/M vs $15/M input tokens.
| Spec | GPT OSS 20B | o1 |
|---|---|---|
| Input price | $0.02/M tokens | $15/M tokens |
| Output price | $0.1/M tokens | $60/M tokens |
| Context window | 131K tokens | 128K tokens |
| Released | Aug 2025 | Dec 2024 |
| MMLU | Matches o3-mini | 91.8% |
Our Verdict
GPT OSS 20B
o1Runner-up
Not enough votes to call it. On the specs, GPT OSS 20B has the edge: bigger model tier, newer.
GPT OSS 20B costs 600x less per token.
Too close to call
API pricing
Cost per 1M tokens
GPT OSS 20B
Input
$0.02
750× cheaper
Output
$0.10
600× cheaper
o1
Input
$15.00
Output
$60.00
GPT OSS 20B is cheaper on both — 750× input, 600× output
Writing DNA
Style Comparison
Similarity
48%
GPT OSS 20B uses 10.2x more emoji
GPT OSS 20B
o1
54%Vocabulary64%
17wSentence Length16w
0.26Hedging0.76
5.9Bold5.0
3.3Lists2.6
0.10Emoji0.00
0.75Headings0.44
0.32Transitions0.40
Based on 21 + 13 text responses
Research
What we learned reading every model
FAQ
