Gemini 2.5 Flash Preview (thinking) vs GPT-4o (Omni)

Compare Gemini 2.5 Flash Preview (thinking) by Google AI against GPT-4o (Omni) by OpenAI, in 2 community votes, gemini 2.5 flash preview (thinking) and gpt-4o (omni) are closely matched, context windows of 1.0M vs 128K, tested across 19 shared challenges. Updated February 2026.

In 2 community votes, Gemini 2.5 Flash Preview (thinking) and GPT-4o (Omni) are closely matched. Based on blind community voting from the RIVAL open dataset of 2+ human preference judgments for this pair.

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