GPT-4.5 vs GPT-5.4 Pro
Compare GPT-4.5 and GPT-5.4 Pro, both from OpenAI, context windows of 128K vs 1.1M, tested across 4 shared challenges.
Our Verdict
GPT-5.4 Pro
GPT-4.5Runner-up
No community votes yet. On paper, GPT-5.4 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
1.2× cheaper
GPT-5.4 Pro
Input
$30.00
2.5× cheaper
Output
$180.00
GPT-5.4 Pro wins input (2.5× cheaper)·GPT-4.5 wins output (1.2× cheaper)
Writing DNA
Style Comparison
Similarity
51%
GPT-4.5 uses 53.6x more transitions
GPT-4.5
GPT-5.4 Pro
63%Vocabulary50%
16wSentence Length35w
0.57Hedging0.70
4.7Bold7.5
6.4Lists8.3
0.00Emoji0.00
1.30Headings2.52
0.54Transitions0.01
Based on 11 + 12 text responses
Research
What we learned reading every model
FAQ
Common questions
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