GPT-4.1 vs GPT-5 Nano

Compare GPT-4.1 and GPT-5 Nano, both from OpenAI, tested across 37 shared challenges. Updated April 2026.

Which is better, GPT-4.1 or GPT-5 Nano?

GPT-4.1 and GPT-5 Nano are both competitive models. Compare their real outputs side by side below.

Key Differences Between GPT-4.1 and GPT-5 Nano

GPT-4.1 is made by openai while GPT-5 Nano is from openai.

Our Verdict
GPT-4.1
GPT-4.1
GPT-5 Nano
GPT-5 Nano

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
100%

GPT-4.1 uses 902.6x more bold

GPT-4.1
GPT-5 Nano
58%Vocabulary59%
19wSentence Length25w
0.38Hedging0.23
9.0Bold0.0
6.1Lists4.2
0.24Emoji0.00
1.01Headings0.00
0.07Transitions0.01
Based on 25 + 14 text responses
vs

Ask them anything yourself

GPT-4.1GPT-5 Nano

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

Common questions