Claude Opus 4 vs GPT OSS 20B
Compare Claude Opus 4 by Anthropic against GPT OSS 20B 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 20BRunner-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 20B is 750x 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 20B
Input
$0.02
750× cheaper
Output
$0.10
750× cheaper
GPT OSS 20B is cheaper on both — 750× input, 750× output
Writing DNA
Style Comparison
Similarity
31%
Claude Opus 4 uses 3.6x more sentence length
Claude Opus 4
GPT OSS 20B
64%Vocabulary54%
62wSentence Length17w
0.52Hedging0.26
4.4Bold5.9
9.1Lists3.3
0.11Emoji0.10
1.87Headings0.75
0.27Transitions0.32
Based on 16 + 21 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
