ChatGPT-4o (March 2025) vs GPT-4.5
Compare ChatGPT-4o (March 2025) and GPT-4.5, both from OpenAI, context windows of 128K vs 128K, tested across 15 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
GPT-4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
ChatGPT-4o (March 2025) is 10x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
15× cheaper
Output
$15.00
10× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
ChatGPT-4o (March 2025) is cheaper on both — 15× input, 10× output
Writing DNA
Style Comparison
Similarity
39%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
GPT-4.5
55%Vocabulary63%
24wSentence Length16w
0.52Hedging0.57
3.3Bold4.7
6.0Lists6.4
0.94Emoji0.00
0.63Headings1.30
0.05Transitions0.54
Based on 15 + 11 text responses
Research
What we learned reading every model
FAQ
