Gemini 2.5 Flash Preview (thinking) vs GPT OSS 120B

Compare Gemini 2.5 Flash Preview (thinking) by Google AI against GPT OSS 120B by OpenAI, in 2 community votes, gpt oss 120b wins 100% of head-to-head duels, context windows of 1.0M vs 131K, tested across 20 shared challenges. Updated February 2026.

In 2 community votes, GPT OSS 120B wins 100% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 2+ human preference judgments for this pair.

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