GPT-4.5vsGPT-5 Pro
GPT-5 Pro is cheaper than GPT-4.5 at $15/M vs $75/M input tokens.
| Spec | GPT-4.5 | GPT-5 Pro |
|---|---|---|
| Input price | $75/M tokens | $15/M tokens |
| Output price | $150/M tokens | $120/M tokens |
| Context window | 128K tokens | 400K tokens |
| Released | Feb 2025 | Oct 2025 |
| SWE-bench Verified | 28.0% | 74.9% |
Our Verdict
GPT-5 Pro
GPT-4.5Runner-up
Not enough votes to call it. On the specs, GPT-5 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
GPT-5 Pro
Input
$15.00
5.0× cheaper
Output
$120.00
1.3× cheaper
GPT-5 Pro is cheaper on both — 5.0× input, 1.3× output
Writing DNA
Style Comparison
Similarity
44%
GPT-4.5 uses 466.6x more bold
GPT-4.5
GPT-5 Pro
63%Vocabulary65%
16wSentence Length15w
0.57Hedging0.32
4.7Bold0.0
6.4Lists2.9
0.00Emoji0.00
1.30Headings0.00
0.54Transitions0.01
Based on 11 + 11 text responses
Research
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