ChatGPT-4o (March 2025) vs Claude 3 Opus
Compare ChatGPT-4o (March 2025) by OpenAI against Claude 3 Opus by Anthropic, context windows of 128K vs 200K, tested across 7 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
Claude 3 Opus
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 5.0x 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
3.0× cheaper
Output
$15.00
5.0× cheaper
Claude 3 Opus
Input
$15.00
Output
$75.00
ChatGPT-4o (March 2025) is cheaper on both — 3.0× input, 5.0× output
Writing DNA
Style Comparison
Similarity
45%
ChatGPT-4o (March 2025) uses 329.7x more bold
ChatGPT-4o (March 2025)
Claude 3 Opus
55%Vocabulary54%
24wSentence Length14w
0.52Hedging0.48
3.3Bold0.0
6.0Lists3.0
0.94Emoji0.00
0.63Headings0.00
0.05Transitions0.06
Based on 15 + 3 text responses
Research
What we learned reading every model
FAQ
