GPT-5 Nano vs Gemini 2.5 Flash Preview (thinking)

Compare GPT-5 Nano by OpenAI against Gemini 2.5 Flash Preview (thinking) by Google AI, in 3 community votes, gemini 2.5 flash preview (thinking) wins 100% of head-to-head duels, tested across 20 shared challenges. Updated February 2026.

In 3 community votes, Gemini 2.5 Flash Preview (thinking) wins 100% of head-to-head duels. Based on blind community voting from the RIVAL open dataset of 3+ human preference judgments for this pair.

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