Claude Sonnet 4.5 vs GPT-5.4 Nano
Compare Claude Sonnet 4.5 by Anthropic against GPT-5.4 Nano by OpenAI, context windows of 200K vs 400K, tested across 42 shared challenges.
Our Verdict
Claude Sonnet 4.5
GPT-5.4 Nano
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.4 Nano is 12x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
GPT-5.4 Nano
Input
$0.20
15× cheaper
Output
$1.25
12× cheaper
GPT-5.4 Nano is cheaper on both — 15× input, 12× output
Writing DNA
Style Comparison
Similarity
55%
Claude Sonnet 4.5 uses 45.2x more emoji
Claude Sonnet 4.5
GPT-5.4 Nano
64%Vocabulary51%
94wSentence Length21w
0.48Hedging0.58
4.9Bold7.1
8.0Lists5.5
0.45Emoji0.01
1.91Headings1.39
0.07Transitions0.05
Based on 20 + 23 text responses
Research
What we learned reading every model
FAQ
