Claude Opus 4.1
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Claude Opus 4.1 vs GPT OSS 20B
Compare Claude Opus 4.1 by Anthropic against GPT OSS 20B by OpenAI, in 1 community votes, gpt oss 20b wins 100% of head-to-head duels, context windows of 200K vs 131K, tested across 27 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.1 or GPT OSS 20B?
GPT OSS 20B is the better choice overall, winning 100% of 1 blind community votes on Rival. Claude Opus 4.1 costs $15/M input tokens vs $0.02/M for GPT OSS 20B. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.1 and GPT OSS 20B
Claude Opus 4.1 is made by anthropic while GPT OSS 20B is from openai. Claude Opus 4.1 has a 200K token context window compared to GPT OSS 20B's 131K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $0.02/M for GPT OSS 20B. In community voting, In 1 community votes, GPT OSS 20B wins 100% of head-to-head duels.
In 1 community votes, GPT OSS 20B wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.
Our Verdict
GPT OSS 20BWinner
Claude Opus 4.1Runner-up
Pick GPT OSS 20B. In 1 blind votes, GPT OSS 20B wins 100% of the time. That's not luck.
GPT OSS 20B is 750x cheaper per token — worth considering if cost matters.
Clear winner
Writing DNA
Style Comparison
Similarity
100%
Claude Opus 4.1 uses 5.2x more sentence length
Claude Opus 4.1
GPT OSS 20B
61%Vocabulary54%
87wSentence Length17w
0.54Hedging0.26
5.1Bold5.9
6.7Lists3.3
0.38Emoji0.10
1.68Headings0.75
0.13Transitions0.32
Based on 17 + 21 text responses
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