Gemini 2.5 Pro (I/O Edition) vs GPT-5 Codex
Compare Gemini 2.5 Pro (I/O Edition) by Google AI against GPT-5 Codex by OpenAI, in 4 community votes, gemini 2.5 pro (i/o edition) and gpt-5 codex are closely matched, tested across 38 shared challenges.
Reasoning: Gemini 2.5 Pro (I/O Edition) wins 67% of votes
Our Verdict
GPT-5 CodexWinner
Gemini 2.5 Pro (I/O Edition)Runner-up
Votes are tied. GPT-5 Codex is newer and likely incorporates more recent improvements.
Gemini 2.5 Pro (I/O Edition) particularly excels in Reasoning.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00
GPT-5 Codex
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
41%
GPT-5 Codex uses 14.6x more emoji
Gemini 2.5 Pro (I/O Edition)
GPT-5 Codex
58%Vocabulary64%
16wSentence Length17w
0.38Hedging0.38
5.8Bold2.3
5.0Lists3.5
0.00Emoji0.15
0.63Headings0.49
0.01Transitions0.05
Based on 16 + 13 text responses
Research
What we learned reading every model
FAQ
