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OpenAI o3 vs Gemini 2.5 Pro (I/O Edition)

Compare OpenAI o3 by OpenAI against Gemini 2.5 Pro (I/O Edition) by Google AI, in 38 community votes, gemini 2.5 pro (i/o edition) wins 73% of head-to-head duels, tested across 35 shared challenges. Updated March 2026.

Which is better, OpenAI o3 or Gemini 2.5 Pro (I/O Edition)?

Gemini 2.5 Pro (I/O Edition) is the better choice overall, winning 73% of 38 blind community votes on Rival. OpenAI o3 costs $10/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 OpenAI o3 and Gemini 2.5 Pro (I/O Edition)

OpenAI o3 is made by openai while Gemini 2.5 Pro (I/O Edition) is from google. On pricing, OpenAI o3 costs $10/M input tokens vs $1.25/M for Gemini 2.5 Pro (I/O Edition). In community voting, In 38 community votes, Gemini 2.5 Pro (I/O Edition) wins 73% of head-to-head duels.

In 38 community votes, Gemini 2.5 Pro (I/O Edition) wins 73% of head-to-head duels. Gemini 2.5 Pro (I/O Edition) leads in Web Design, Reasoning, Image Generation. Based on blind community voting from the Rival open dataset of 38+ human preference judgments for this pair.

Web Design: Gemini 2.5 Pro (I/O Edition) wins 64% of votes
Reasoning: Gemini 2.5 Pro (I/O Edition) wins 67% of votes
Image Generation: Gemini 2.5 Pro (I/O Edition) wins 100% of votes
Conversation: Gemini 2.5 Pro (I/O Edition) wins 75% of votes
Our Verdict
Gemini 2.5 Pro (I/O Edition)
Gemini 2.5 Pro (I/O Edition)Winner
OpenAI o3
OpenAI o3Runner-up

Pick Gemini 2.5 Pro (I/O Edition). In 38 blind votes, Gemini 2.5 Pro (I/O Edition) wins 73% of the time. That's not luck.

Gemini 2.5 Pro (I/O Edition) particularly excels in Image Generation, Conversation, Reasoning. Gemini 2.5 Pro (I/O Edition) is 4.0x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
99%

OpenAI o3 uses 9.9x more transitions

OpenAI o3
Gemini 2.5 Pro (I/O Edition)
68%Vocabulary58%
14wSentence Length16w
0.26Hedging0.38
0.7Bold5.8
3.0Lists5.0
0.00Emoji0.00
0.38Headings0.63
0.12Transitions0.01
Based on 16 + 16 text responses
vs

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OpenAI o3Gemini 2.5 Pro (I/O Edition)
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