Claude Sonnet 5 vs GPT-5.4 Pro
Compare Claude Sonnet 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 Sonnet 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 Sonnet 5 is 18x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 5
Input
$2.00
15× cheaper
Output
$10.00
18× cheaper
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Claude Sonnet 5 is cheaper on both — 15× input, 18× output
Writing DNA
Style Comparison
Similarity
56%
Claude Sonnet 5 uses 79.4x more emoji
Claude Sonnet 5
GPT-5.4 Pro
59%Vocabulary50%
35wSentence Length35w
0.53Hedging0.70
3.5Bold7.5
3.5Lists8.3
0.79Emoji0.00
1.25Headings2.52
0.06Transitions0.01
Based on 27 + 12 text responses
Research
What we learned reading every model
FAQ
