Claude Sonnet 4 vs GPT OSS 120B
Compare Claude Sonnet 4 by Anthropic against GPT OSS 120B by OpenAI, in 12 community votes, claude sonnet 4 wins 63% of head-to-head duels, context windows of 200K vs 131K, tested across 54 shared challenges.
Reasoning: GPT OSS 120B wins 100% of votes
Web Design: Claude Sonnet 4 and GPT OSS 120B are tied
Image Generation: Claude Sonnet 4 wins 100% of votes
Our Verdict
Claude Sonnet 4Winner
GPT OSS 120BRunner-up
Pick Claude Sonnet 4. In 12 blind votes, Claude Sonnet 4 wins 63% of the time. That's not luck.
Pick Claude Sonnet 4 for Image Generation. Pick GPT OSS 120B for Reasoning. GPT OSS 120B is 19x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
GPT OSS 120B
Input
$0.18
17× cheaper
Output
$0.80
19× cheaper
GPT OSS 120B is cheaper on both — 17× input, 19× output
Writing DNA
Style Comparison
Similarity
40%
Claude Sonnet 4 uses 5.8x more sentence length
Claude Sonnet 4
GPT OSS 120B
62%Vocabulary52%
111wSentence Length19w
0.40Hedging0.28
5.0Bold7.4
9.3Lists1.8
0.88Emoji0.15
2.16Headings0.73
0.33Transitions0.17
Based on 17 + 21 text responses
Research
What we learned reading every model
FAQ
