GPT-4.1 Nano vs GPT-5.1 Codex Max
Compare GPT-4.1 Nano and GPT-5.1 Codex Max, both from OpenAI, tested across 53 shared challenges. Updated April 2026.
Which is better, GPT-4.1 Nano or GPT-5.1 Codex Max?
GPT-4.1 Nano and GPT-5.1 Codex Max are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-4.1 Nano and GPT-5.1 Codex Max
GPT-4.1 Nano is made by openai while GPT-5.1 Codex Max is from openai.
No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier, newer.
Style Comparison
GPT-4.1 Nano uses 8.6x more transitions
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
