Claude Opus 4
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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 35 shared challenges. Updated April 2026.
Which is better, Claude Opus 4 or GPT OSS 120B?
Claude Opus 4 is the better choice overall, winning 100% of 2 blind community votes on Rival. Claude Opus 4 costs $15/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and GPT OSS 120B
Claude Opus 4 is made by anthropic while GPT OSS 120B is from openai. Claude Opus 4 has a 200K token context window compared to GPT OSS 120B's 131K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0.18/M for GPT OSS 120B. 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
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
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