Claude Sonnet 4.5 vs Claude Haiku 4.5
Compare Claude Sonnet 4.5 and Claude Haiku 4.5, both from Anthropic, in 122 community votes, claude sonnet 4.5 wins 59% of head-to-head duels, context windows of 200K vs 200K, tested across 43 shared challenges.
Web Design: Claude Sonnet 4.5 wins 62% of votes
Image Generation: Claude Sonnet 4.5 wins 57% of votes
Reasoning: Claude Sonnet 4.5 and Claude Haiku 4.5 are tied
Conversation: Claude Sonnet 4.5 wins 75% of votes
Analysis: Claude Sonnet 4.5 and Claude Haiku 4.5 are tied
Our Verdict
Claude Sonnet 4.5Winner
Claude Haiku 4.5Runner-up
Pick Claude Sonnet 4.5. In 122 blind votes, Claude Sonnet 4.5 wins 59% of the time. That's not luck.
Claude Sonnet 4.5 particularly excels in Conversation, Web Design, Image Generation. Claude Haiku 4.5 is 3.0x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Claude Haiku 4.5
Input
$1.00
3.0× cheaper
Output
$5.00
3.0× cheaper
Claude Haiku 4.5 is cheaper on both — 3.0× input, 3.0× output
Writing DNA
Style Comparison
Similarity
83%
Claude Haiku 4.5 uses 2.3x more transitions
Claude Sonnet 4.5
Claude Haiku 4.5
64%Vocabulary61%
94wSentence Length47w
0.48Hedging0.64
4.9Bold5.1
8.0Lists6.3
0.45Emoji0.20
1.91Headings2.46
0.07Transitions0.17
Based on 20 + 24 text responses
Research
What we learned reading every model
FAQ
