Gemini 2.5 Flash Preview (thinking) vs OpenAI o4 Mini High

Compare Gemini 2.5 Flash Preview (thinking) by Google AI against OpenAI o4 Mini High by OpenAI, in 1 community votes, openai o4 mini high wins 100% of head-to-head duels, context windows of 1.0M vs 200K, tested across 15 shared challenges. Updated February 2026.

In 1 community votes, OpenAI o4 Mini High 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.

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