GPT-5.1 vs Gemini 2.5 Pro (I/O Edition)

Compare GPT-5.1 by OpenAI against Gemini 2.5 Pro (I/O Edition) by Google AI, in 21 community votes, gemini 2.5 pro (i/o edition) wins 62% of head-to-head duels, tested across 35 shared challenges. Updated February 2026.

In 21 community votes, Gemini 2.5 Pro (I/O Edition) wins 62% of head-to-head duels. Gemini 2.5 Pro (I/O Edition) leads in Reasoning, Web Design. Based on blind community voting from the RIVAL open dataset of 21+ human preference judgments for this pair.

Image Generation: GPT-5.1 and Gemini 2.5 Pro (I/O Edition) are tied
Reasoning: Gemini 2.5 Pro (I/O Edition) wins 67% of votes
Web Design: Gemini 2.5 Pro (I/O Edition) wins 100% of votes
FAQ