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GPT OSS 20B vs Gemini 2.5 Pro Preview 06-05

Compare GPT OSS 20B by OpenAI against Gemini 2.5 Pro Preview 06-05 by Google AI, in 2 community votes, gpt oss 20b and gemini 2.5 pro preview 06-05 are closely matched, context windows of 131K vs 1.0M, tested across 38 shared challenges. Updated March 2026.

Which is better, GPT OSS 20B or Gemini 2.5 Pro Preview 06-05?

GPT OSS 20B and Gemini 2.5 Pro Preview 06-05 are closely matched based on 2 community votes. GPT OSS 20B costs $0.02/M input tokens vs $1.25/M for Gemini 2.5 Pro Preview 06-05. Context windows: 131K vs 1049K tokens. Compare their real outputs side by side below.

Key Differences Between GPT OSS 20B and Gemini 2.5 Pro Preview 06-05

GPT OSS 20B is made by openai while Gemini 2.5 Pro Preview 06-05 is from google. GPT OSS 20B has a 131K token context window compared to Gemini 2.5 Pro Preview 06-05's 1049K. On pricing, GPT OSS 20B costs $0.02/M input tokens vs $1.25/M for Gemini 2.5 Pro Preview 06-05. In community voting, In 2 community votes, GPT OSS 20B and Gemini 2.5 Pro Preview 06-05 are closely matched.

In 2 community votes, GPT OSS 20B and Gemini 2.5 Pro Preview 06-05 are closely matched. GPT OSS 20B and Gemini 2.5 Pro Preview 06-05 perform similarly across challenge categories. Based on blind community voting from the Rival open dataset of 2+ human preference judgments for this pair.

Web Design: GPT OSS 20B and Gemini 2.5 Pro Preview 06-05 are tied
Our Verdict
GPT OSS 20B
GPT OSS 20BWinner
Gemini 2.5 Pro Preview 06-05
Gemini 2.5 Pro Preview 06-05Runner-up

Votes are tied. GPT OSS 20B is newer and likely incorporates more recent improvements.

GPT OSS 20B is 100x cheaper per token — worth considering if cost matters.

Too close to call
vs

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GPT OSS 20BGemini 2.5 Pro Preview 06-05
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