Google: Gemini 2.5 Flash Preview 09-2025 vs GPT-5.1 Codex Max
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against GPT-5.1 Codex Max by OpenAI, tested across 51 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
GPT-5.1 Codex Max
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
Output
$2.50
GPT-5.1 Codex Max
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
34%
Google: Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Google: Gemini 2.5 Flash Preview 09-2025
GPT-5.1 Codex Max
53%Vocabulary60%
19wSentence Length16w
0.30Hedging0.36
5.8Bold2.3
3.1Lists4.2
0.14Emoji0.00
0.93Headings0.12
0.22Transitions0.03
Based on 22 + 13 text responses
Research
What we learned reading every model
FAQ
