Claude Opus 5 vs GPT-5.4
Compare Claude Opus 5 by Anthropic against GPT-5.4 by OpenAI, context windows of 1.0M vs 1.1M, tested across 53 shared challenges.
Our Verdict
Claude Opus 5
GPT-5.4
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
Claude Opus 5
Input
$5.00
Output
$25.00
GPT-5.4
Input
$2.50
2.0× cheaper
Output
$15.00
1.7× cheaper
GPT-5.4 is cheaper on both — 2.0× input, 1.7× output
Writing DNA
Style Comparison
Similarity
44%
Claude Opus 5 uses 1.7x more emoji
Claude Opus 5
GPT-5.4
54%Vocabulary54%
21wSentence Length28w
0.40Hedging0.69
3.9Bold4.1
1.9Lists8.1
0.02Emoji0.00
0.71Headings1.84
0.05Transitions0.02
Based on 27 + 22 text responses
Research
What we learned reading every model
FAQ
