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

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

In 2 community votes, GPT-4o (Omni) and Gemini 2.5 Flash Preview (thinking) 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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