GPT-5 Codex
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Codex vs GPT-5.1-Codex-Mini
Compare GPT-5 Codex and GPT-5.1-Codex-Mini, both from OpenAI, tested across 50 shared challenges. Updated April 2026.
Which is better, GPT-5 Codex or GPT-5.1-Codex-Mini?
GPT-5 Codex and GPT-5.1-Codex-Mini are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-5 Codex and GPT-5.1-Codex-Mini
GPT-5 Codex is made by openai while GPT-5.1-Codex-Mini is from openai.
Our Verdict
GPT-5 Codex
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
Writing DNA
Style Comparison
Similarity
99%
GPT-5 Codex uses 14.6x more emoji
GPT-5 Codex
GPT-5.1-Codex-Mini
64%Vocabulary65%
17wSentence Length20w
0.38Hedging0.56
2.3Bold3.3
3.5Lists3.4
0.15Emoji0.00
0.49Headings0.08
0.05Transitions0.05
Based on 13 + 13 text responses
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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