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GPT-4.1 Nano vs GPT OSS 20B

Compare GPT-4.1 Nano and GPT OSS 20B, both from OpenAI, in 3 community votes, gpt oss 20b wins 100% of head-to-head duels, context windows of 1.0M vs 131K, tested across 40 shared challenges. Updated April 2026.

Which is better, GPT-4.1 Nano or GPT OSS 20B?

GPT OSS 20B is the better choice overall, winning 100% of 3 blind community votes on Rival. GPT-4.1 Nano costs $0.1/M input tokens vs $0.02/M for GPT OSS 20B. Context windows: 1048K vs 131K tokens. Compare their real outputs side by side below.

Key Differences Between GPT-4.1 Nano and GPT OSS 20B

GPT-4.1 Nano is made by openai while GPT OSS 20B is from openai. GPT-4.1 Nano has a 1048K token context window compared to GPT OSS 20B's 131K. On pricing, GPT-4.1 Nano costs $0.1/M input tokens vs $0.02/M for GPT OSS 20B. In community voting, In 3 community votes, GPT OSS 20B wins 100% of head-to-head duels.

In 3 community votes, GPT OSS 20B wins 100% of head-to-head duels. GPT OSS 20B leads in Reasoning. Based on blind community voting from the Rival open dataset of 3+ human preference judgments for this pair.

Reasoning: GPT OSS 20B wins 100% of votes
Our Verdict
GPT OSS 20B
GPT OSS 20BWinner
GPT-4.1 Nano
GPT-4.1 NanoRunner-up

Pick GPT OSS 20B. In 3 blind votes, GPT OSS 20B wins 100% of the time. That's not luck.

GPT OSS 20B particularly excels in Reasoning. GPT OSS 20B is 4.0x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
100%

GPT OSS 20B uses 10.2x more emoji

GPT-4.1 Nano
GPT OSS 20B
57%Vocabulary54%
25wSentence Length17w
0.72Hedging0.26
5.6Bold5.9
4.9Lists3.3
0.00Emoji0.10
0.71Headings0.75
0.22Transitions0.32
Based on 24 + 21 text responses
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