GPT-5.1 vs GPT-5.4
Compare GPT-5.1 and GPT-5.4, both from OpenAI, context windows of 400K vs 1.1M, tested across 51 shared challenges.
Our Verdict
GPT-5.4
GPT-5.1Runner-up
No community votes yet. On paper, GPT-5.4 has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.1
Input
$1.25
2.0× cheaper
Output
$10.00
1.5× cheaper
GPT-5.4
Input
$2.50
Output
$15.00
GPT-5.1 is cheaper on both — 2.0× input, 1.5× output
Writing DNA
Style Comparison
Similarity
64%
GPT-5.4 uses 3.0x more headings
GPT-5.1
GPT-5.4
62%Vocabulary54%
19wSentence Length28w
0.29Hedging0.69
3.5Bold4.1
7.2Lists8.1
0.00Emoji0.00
0.61Headings1.84
0.03Transitions0.02
Based on 14 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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