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Claude Haiku 4.5 vs Claude Sonnet 4

Compare Claude Haiku 4.5 and Claude Sonnet 4, both from Anthropic, in 14 community votes, claude haiku 4.5 wins 78% of head-to-head duels, context windows of 200K vs 200K, tested across 34 shared challenges. Updated April 2026.

Which is better, Claude Haiku 4.5 or Claude Sonnet 4?

Claude Haiku 4.5 is the better choice overall, winning 78% of 14 blind community votes on Rival. Claude Haiku 4.5 costs $1/M input tokens vs $3/M for Claude Sonnet 4. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Haiku 4.5 and Claude Sonnet 4

Claude Haiku 4.5 is made by anthropic while Claude Sonnet 4 is from anthropic. Claude Haiku 4.5 has a 200K token context window compared to Claude Sonnet 4's 200K. On pricing, Claude Haiku 4.5 costs $1/M input tokens vs $3/M for Claude Sonnet 4. In community voting, In 14 community votes, Claude Haiku 4.5 wins 78% of head-to-head duels.

In 14 community votes, Claude Haiku 4.5 wins 78% of head-to-head duels. Claude Haiku 4.5 leads in Web Design. Based on blind community voting from the Rival open dataset of 14+ human preference judgments for this pair.

Web Design: Claude Haiku 4.5 wins 83% of votes
Our Verdict
Claude Haiku 4.5
Claude Haiku 4.5Winner
Claude Sonnet 4
Claude Sonnet 4Runner-up

Pick Claude Haiku 4.5. In 14 blind votes, Claude Haiku 4.5 wins 78% of the time. That's not luck.

Claude Haiku 4.5 particularly excels in Web Design. Claude Haiku 4.5 is 3.0x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
100%

Claude Sonnet 4 uses 4.3x more emoji

Claude Haiku 4.5
Claude Sonnet 4
61%Vocabulary62%
47wSentence Length111w
0.64Hedging0.40
5.1Bold5.0
6.3Lists9.3
0.20Emoji0.88
2.46Headings2.16
0.17Transitions0.33
Based on 24 + 17 text responses
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