Google: Gemini 2.5 Flash Preview 09-2025 vs GPT-5.1-Codex-Mini
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against GPT-5.1-Codex-Mini by OpenAI, context windows of 1.0M vs 400K, tested across 51 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
GPT-5.1-Codex-Mini
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
5.0× cheaper
Output
$2.50
2.4× cheaper
GPT-5.1-Codex-Mini
Input
$1.50
Output
$6.00
Google: Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 5.0× input, 2.4× output
Writing DNA
Style Comparison
Similarity
32%
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-Mini
53%Vocabulary65%
19wSentence Length20w
0.30Hedging0.56
5.8Bold3.3
3.1Lists3.4
0.14Emoji0.00
0.93Headings0.08
0.22Transitions0.05
Based on 22 + 13 text responses
Research
What we learned reading every model
FAQ
