Gemini 2.5 Flash Preview (thinking) vs GPT OSS 20B

Compare Gemini 2.5 Flash Preview (thinking) by Google AI against GPT OSS 20B by OpenAI, in 6 community votes, gemini 2.5 flash preview (thinking) and gpt oss 20b are closely matched, context windows of 1.0M vs 131K, tested across 20 shared challenges. Updated February 2026.

In 6 community votes, Gemini 2.5 Flash Preview (thinking) and GPT OSS 20B are closely matched. Gemini 2.5 Flash Preview (thinking) and GPT OSS 20B perform similarly across challenge categories. Based on blind community voting from the RIVAL open dataset of 6+ human preference judgments for this pair.

Web Design: Gemini 2.5 Flash Preview (thinking) and GPT OSS 20B are tied
Image Generation: Gemini 2.5 Flash Preview (thinking) and GPT OSS 20B are tied
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