GPT-5 Codex
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Codex vs Gemini 3.1 Pro Preview
Compare GPT-5 Codex by OpenAI against Gemini 3.1 Pro Preview by Google AI, tested across 49 shared challenges. Updated April 2026.
Which is better, GPT-5 Codex or Gemini 3.1 Pro Preview?
GPT-5 Codex and Gemini 3.1 Pro Preview are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-5 Codex and Gemini 3.1 Pro Preview
GPT-5 Codex is made by openai while Gemini 3.1 Pro Preview is from google.
Our Verdict
GPT-5 Codex
Gemini 3.1 Pro Preview
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
Writing DNA
Style Comparison
Similarity
99%
GPT-5 Codex uses 14.6x more emoji
GPT-5 Codex
Gemini 3.1 Pro Preview
64%Vocabulary54%
17wSentence Length18w
0.38Hedging0.29
2.3Bold4.9
3.5Lists3.3
0.15Emoji0.00
0.49Headings0.72
0.05Transitions0.14
Based on 13 + 23 text responses
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
Model Similarity Index
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ