GPT-5.4 Mini vs GPT-5.5
Compare GPT-5.4 Mini and GPT-5.5, both from OpenAI, context windows of 400K vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-5.5
GPT-5.4 MiniRunner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier, newer, bigger context window.
GPT-5.4 Mini is 6.7x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.4 Mini
Input
$0.75
6.7× cheaper
Output
$4.50
6.7× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
GPT-5.4 Mini is cheaper on both — 6.7× input, 6.7× output
Writing DNA
Style Comparison
Similarity
66%
GPT-5.4 Mini uses 2.1x more bold
GPT-5.4 Mini
GPT-5.5
54%Vocabulary58%
20wSentence Length18w
0.72Hedging0.74
6.0Bold2.9
8.3Lists5.1
0.00Emoji0.00
2.11Headings1.68
0.04Transitions0.03
Based on 23 + 26 text responses
Research
What we learned reading every model
FAQ
