GPT-5.1
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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 April 2026.
Which is better, GPT-5.1 or Gemini 2.5 Pro (I/O Edition)?
Gemini 2.5 Pro (I/O Edition) is the better choice overall, winning 62% of 21 blind community votes on Rival. GPT-5.1 costs $1.25/M input tokens vs $1.25/M for Gemini 2.5 Pro (I/O Edition). Compare their real outputs side by side below.
Key Differences Between GPT-5.1 and Gemini 2.5 Pro (I/O Edition)
GPT-5.1 is made by openai while Gemini 2.5 Pro (I/O Edition) is from google. On pricing, GPT-5.1 costs $1.25/M input tokens vs $1.25/M for Gemini 2.5 Pro (I/O Edition). In community voting, In 21 community votes, Gemini 2.5 Pro (I/O Edition) wins 62% of head-to-head duels.
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
Our Verdict
Gemini 2.5 Pro (I/O Edition)Winner
GPT-5.1Runner-up
Pick Gemini 2.5 Pro (I/O Edition). In 21 blind votes, Gemini 2.5 Pro (I/O Edition) wins 62% of the time. That's not luck.
Gemini 2.5 Pro (I/O Edition) particularly excels in Web Design, Reasoning.
Clear winner
Writing DNA
Style Comparison
Similarity
97%
GPT-5.1 uses 2.3x more transitions
GPT-5.1
Gemini 2.5 Pro (I/O Edition)
62%Vocabulary58%
19wSentence Length16w
0.29Hedging0.38
3.5Bold5.8
7.2Lists5.0
0.00Emoji0.00
0.61Headings0.63
0.03Transitions0.01
Based on 14 + 16 text responses
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