Claude Sonnet 4.5 vs GPT-5.2
Compare Claude Sonnet 4.5 by Anthropic against GPT-5.2 by OpenAI, in 12 community votes, claude sonnet 4.5 wins 67% of head-to-head duels, context windows of 200K vs 400K, tested across 43 shared challenges.
Image Generation: Claude Sonnet 4.5 and GPT-5.2 are tied
Reasoning: Claude Sonnet 4.5 wins 100% of votes
Conversation: Claude Sonnet 4.5 and GPT-5.2 are tied
Our Verdict
Claude Sonnet 4.5Winner
GPT-5.2Runner-up
Pick Claude Sonnet 4.5. In 12 blind votes, Claude Sonnet 4.5 wins 67% of the time. That's not luck.
Claude Sonnet 4.5 particularly excels in Reasoning.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
GPT-5.2
Input
$1.75
1.7× cheaper
Output
$14.00
1.1× cheaper
GPT-5.2 is cheaper on both — 1.7× input, 1.1× output
Writing DNA
Style Comparison
Similarity
45%
Claude Sonnet 4.5 uses 7.8x more emoji
Claude Sonnet 4.5
GPT-5.2
64%Vocabulary64%
94wSentence Length16w
0.48Hedging0.34
4.9Bold9.4
8.0Lists3.9
0.45Emoji0.06
1.91Headings0.89
0.07Transitions0.31
Based on 20 + 15 text responses
Research
What we learned reading every model
FAQ
