GPT-4.5 vs GPT-5.2 Pro
Compare GPT-4.5 and GPT-5.2 Pro, both from OpenAI, context windows of 128K vs 400K, tested across 10 shared challenges.
Our Verdict
GPT-5.2 Pro
GPT-4.5Runner-up
No community votes yet. On paper, GPT-5.2 Pro has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.5
Input
$75.00
Output
$150.00
1.1× cheaper
GPT-5.2 Pro
Input
$21.00
3.6× cheaper
Output
$168.00
GPT-5.2 Pro wins input (3.6× cheaper)·GPT-4.5 wins output (1.1× cheaper)
Writing DNA
Style Comparison
Similarity
50%
GPT-4.5 uses 33.5x more transitions
GPT-4.5
GPT-5.2 Pro
63%Vocabulary62%
16wSentence Length19w
0.57Hedging0.39
4.7Bold8.6
6.4Lists3.8
0.00Emoji0.00
1.30Headings1.17
0.54Transitions0.02
Based on 11 + 10 text responses
Research
What we learned reading every model
FAQ
Common questions
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