Claude Sonnet 4 vs GPT-4.5
Compare Claude Sonnet 4 by Anthropic against GPT-4.5 by OpenAI, context windows of 200K vs 128K, tested across 25 shared challenges.
Our Verdict
Claude Sonnet 4
GPT-4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Claude Sonnet 4 is 10x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
25× cheaper
Output
$15.00
10× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
Claude Sonnet 4 is cheaper on both — 25× input, 10× output
Writing DNA
Style Comparison
Similarity
60%
Claude Sonnet 4 uses 87.9x more emoji
Claude Sonnet 4
GPT-4.5
62%Vocabulary63%
111wSentence Length16w
0.40Hedging0.57
5.0Bold4.7
9.3Lists6.4
0.88Emoji0.00
2.16Headings1.30
0.33Transitions0.54
Based on 17 + 11 text responses
Research
What we learned reading every model
FAQ
Common questions
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