GPT-4 vs GPT-5.5
Compare GPT-4 and GPT-5.5, both from OpenAI, context windows of 8K vs 1.1M, tested across 26 shared challenges.
Our Verdict
GPT-5.5
GPT-4Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-4
Input
$30.00
Output
$60.00
GPT-5.5
Input
$5.00
6.0× cheaper
Output
$30.00
2.0× cheaper
GPT-5.5 is cheaper on both — 6.0× input, 2.0× output
Writing DNA
Style Comparison
Similarity
82%
GPT-5.5 uses 167.8x more headings
GPT-4
GPT-5.5
59%Vocabulary58%
18wSentence Length18w
1.10Hedging0.74
0.8Bold2.9
2.5Lists5.1
0.00Emoji0.00
0.00Headings1.68
0.45Transitions0.03
Based on 15 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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