GPT OSS 120B
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GPT OSS 120B vs Claude Opus 4
Compare GPT OSS 120B by OpenAI against Claude Opus 4 by Anthropic, in 2 community votes, claude opus 4 wins 100% of head-to-head duels, context windows of 131K vs 200K, tested across 35 shared challenges. Updated April 2026.
Which is better, GPT OSS 120B or Claude Opus 4?
Claude Opus 4 is the better choice overall, winning 100% of 2 blind community votes on Rival. GPT OSS 120B costs $0.18/M input tokens vs $15/M for Claude Opus 4. Context windows: 131K vs 200K tokens. Compare their real outputs side by side below.
Key Differences Between GPT OSS 120B and Claude Opus 4
GPT OSS 120B is made by openai while Claude Opus 4 is from anthropic. GPT OSS 120B has a 131K token context window compared to Claude Opus 4's 200K. On pricing, GPT OSS 120B costs $0.18/M input tokens vs $15/M for Claude Opus 4. In community voting, In 2 community votes, Claude Opus 4 wins 100% of head-to-head duels.
In 2 community votes, Claude Opus 4 wins 100% of head-to-head duels. Claude Opus 4 leads in Web Design. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.
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
Writing DNA
Style Comparison
Similarity
97%
Claude Opus 4 uses 5.0x more lists
GPT OSS 120B
Claude Opus 4
52%Vocabulary64%
19wSentence Length62w
0.28Hedging0.52
7.4Bold4.4
1.8Lists9.1
0.15Emoji0.11
0.73Headings1.87
0.17Transitions0.27
Based on 21 + 16 text responses
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