Claude Opus 4 vs GPT OSS 120B
Compare Claude Opus 4 by Anthropic against GPT OSS 120B by OpenAI, in 2 community votes, claude opus 4 wins 100% of head-to-head duels, context windows of 200K vs 131K, tested across 53 shared challenges.
Web Design: Claude Opus 4 wins 100% of votes
Our Verdict
Claude Opus 4Winner
GPT OSS 120BRunner-up
Pick Claude Opus 4. In 2 blind votes, Claude Opus 4 wins 100% of the time. That's not luck.
Claude Opus 4 particularly excels in Web Design. GPT OSS 120B is 94x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
GPT OSS 120B
Input
$0.18
83× cheaper
Output
$0.80
94× cheaper
GPT OSS 120B is cheaper on both — 83× input, 94× output
Writing DNA
Style Comparison
Similarity
36%
Claude Opus 4 uses 5.0x more lists
Claude Opus 4
GPT OSS 120B
64%Vocabulary52%
62wSentence Length19w
0.52Hedging0.28
4.4Bold7.4
9.1Lists1.8
0.11Emoji0.15
1.87Headings0.73
0.27Transitions0.17
Based on 16 + 21 text responses
Research
What we learned reading every model
FAQ
