ChatGPT-4o (March 2025) vs Claude Sonnet 5
Compare ChatGPT-4o (March 2025) by OpenAI against Claude Sonnet 5 by Anthropic, context windows of 128K vs 1.0M, tested across 32 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
Claude Sonnet 5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Claude Sonnet 5
Input
$2.00
2.5× cheaper
Output
$10.00
1.5× cheaper
Claude Sonnet 5 is cheaper on both — 2.5× input, 1.5× output
Writing DNA
Style Comparison
Similarity
68%
Claude Sonnet 5 uses 2.0x more headings
ChatGPT-4o (March 2025)
Claude Sonnet 5
55%Vocabulary59%
24wSentence Length35w
0.52Hedging0.53
3.3Bold3.5
6.0Lists3.5
0.94Emoji0.79
0.63Headings1.25
0.05Transitions0.06
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
