GPT-5 vs GPT-5.5
Compare GPT-5 and GPT-5.5, both from OpenAI, context windows of 400K vs 1.1M, tested across 51 shared challenges.
Our Verdict
GPT-5.5
GPT-5Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.
GPT-5 is 3.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5
Input
$1.25
4.0× cheaper
Output
$10.00
3.0× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
GPT-5 is cheaper on both — 4.0× input, 3.0× output
Writing DNA
Style Comparison
Similarity
50%
GPT-5.5 uses 15.1x more bold
GPT-5
GPT-5.5
65%Vocabulary58%
13wSentence Length18w
0.20Hedging0.74
0.2Bold2.9
4.6Lists5.1
0.00Emoji0.00
0.16Headings1.68
0.03Transitions0.03
Based on 16 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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