Claude Opus 4.8 vs GPT-5.4 Pro
Compare Claude Opus 4.8 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 4.8
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 4.8 is 7.2x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.8
Input
$5.00
6.0× cheaper
Output
$25.00
7.2× cheaper
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Claude Opus 4.8 is cheaper on both — 6.0× input, 7.2× output
Writing DNA
Style Comparison
Similarity
47%
Claude Opus 4.8 uses 77.6x more emoji
Claude Opus 4.8
GPT-5.4 Pro
60%Vocabulary50%
19wSentence Length35w
0.46Hedging0.70
4.7Bold7.5
3.2Lists8.3
0.78Emoji0.00
1.15Headings2.52
0.04Transitions0.01
Based on 27 + 12 text responses
Research
What we learned reading every model
FAQ
