Gemini 3.1 Pro Preview vs GPT OSS 120B

Compare Gemini 3.1 Pro Preview by Google AI against GPT OSS 120B by OpenAI, in 1 community votes, gemini 3.1 pro preview wins 100% of head-to-head duels, context windows of 1.0M vs 131K, tested across 48 shared challenges. Updated April 2026.

Which is better, Gemini 3.1 Pro Preview or GPT OSS 120B?

Gemini 3.1 Pro Preview is the better choice overall, winning 100% of 1 blind community votes on Rival. Gemini 3.1 Pro Preview costs $2/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 1049K vs 131K tokens. Compare their real outputs side by side below.

Key Differences Between Gemini 3.1 Pro Preview and GPT OSS 120B

Gemini 3.1 Pro Preview is made by google while GPT OSS 120B is from openai. Gemini 3.1 Pro Preview has a 1049K token context window compared to GPT OSS 120B's 131K. On pricing, Gemini 3.1 Pro Preview costs $2/M input tokens vs $0.18/M for GPT OSS 120B. In community voting, In 1 community votes, Gemini 3.1 Pro Preview wins 100% of head-to-head duels.

In 1 community votes, Gemini 3.1 Pro Preview 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
Gemini 3.1 Pro Preview
Gemini 3.1 Pro PreviewWinner
GPT OSS 120B
GPT OSS 120BRunner-up

Pick Gemini 3.1 Pro Preview. In 1 blind votes, Gemini 3.1 Pro Preview wins 100% of the time. That's not luck.

GPT OSS 120B is 15x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
100%

GPT OSS 120B uses 15.4x more emoji

Gemini 3.1 Pro Preview
GPT OSS 120B
54%Vocabulary52%
18wSentence Length19w
0.29Hedging0.28
4.9Bold7.4
3.3Lists1.8
0.00Emoji0.15
0.72Headings0.73
0.14Transitions0.17
Based on 23 + 21 text responses
vs

Ask them anything yourself

Gemini 3.1 Pro PreviewGPT OSS 120B

Some models write identically. You are paying for the brand.

178 models fingerprinted across 32 writing dimensions. Free research.

Model Similarity Index

185x

price gap between models that write identically

178

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12

clone pairs

32

dimensions

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95.7%
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95.6%
GPT-5.4 / Mini
93.3%

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
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