GPT-5.4 vs GPT-5.5
Compare GPT-5.4 and GPT-5.5, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-5.4
GPT-5.5
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
API pricing
Cost per 1M tokens
GPT-5.4
Input
$2.50
2.0× cheaper
Output
$15.00
2.0× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
GPT-5.4 is cheaper on both — 2.0× input, 2.0× output
Writing DNA
Style Comparison
Similarity
67%
GPT-5.5 uses 1.9x more transitions
GPT-5.4
GPT-5.5
54%Vocabulary58%
28wSentence Length18w
0.69Hedging0.74
4.1Bold2.9
8.1Lists5.1
0.00Emoji0.00
1.84Headings1.68
0.02Transitions0.03
Based on 22 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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