Claude Sonnet 4.5 vs GPT-5
Compare Claude Sonnet 4.5 by Anthropic against GPT-5 by OpenAI, in 53 community votes, claude sonnet 4.5 wins 64% of head-to-head duels, context windows of 200K vs 400K, tested across 42 shared challenges.
Web Design: Claude Sonnet 4.5 wins 74% of votes
Reasoning: Claude Sonnet 4.5 wins 89% of votes
Image Generation: GPT-5 wins 75% of votes
Conversation: GPT-5 wins 67% of votes
Our Verdict
Claude Sonnet 4.5Winner
GPT-5Runner-up
Pick Claude Sonnet 4.5. In 53 blind votes, Claude Sonnet 4.5 wins 64% of the time. That's not luck.
Pick Claude Sonnet 4.5 for Reasoning, Web Design. Pick GPT-5 for Image Generation, Conversation.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
GPT-5
Input
$1.25
2.4× cheaper
Output
$10.00
1.5× cheaper
GPT-5 is cheaper on both — 2.4× input, 1.5× output
Writing DNA
Style Comparison
Similarity
46%
Claude Sonnet 4.5 uses 45.2x more emoji
Claude Sonnet 4.5
GPT-5
64%Vocabulary65%
94wSentence Length13w
0.48Hedging0.20
4.9Bold0.2
8.0Lists4.6
0.45Emoji0.00
1.91Headings0.16
0.07Transitions0.03
Based on 20 + 16 text responses
Research
What we learned reading every model
FAQ
