Claude Opus 5 vs GPT-5.4 Pro
Compare Claude Opus 5 by Anthropic against GPT-5.4 Pro by OpenAI, context windows of 1.0M vs 1.1M, tested across 18 shared challenges.
Our Verdict
Claude Opus 5
GPT-5.4 Pro
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Claude Opus 5 is 7.2x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
6.0× cheaper
Output
$25.00
7.2× cheaper
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Claude Opus 5 is cheaper on both — 6.0× input, 7.2× output
Writing DNA
Style Comparison
Similarity
48%
Claude Opus 5 uses 1.7x more emoji
Claude Opus 5
GPT-5.4 Pro
54%Vocabulary50%
21wSentence Length35w
0.40Hedging0.70
3.9Bold7.5
1.9Lists8.3
0.02Emoji0.00
0.71Headings2.52
0.05Transitions0.01
Based on 27 + 12 text responses
Research
What we learned reading every model
FAQ
