Claude Haiku 4.5 vs Claude Opus 5
Compare Claude Haiku 4.5 and Claude Opus 5, both from Anthropic, context windows of 200K vs 1.0M, tested across 53 shared challenges.
Our Verdict
Claude Opus 5
Claude Haiku 4.5Runner-up
No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window.
Claude Haiku 4.5 is 5.0x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Claude Haiku 4.5
Input
$1.00
5.0× cheaper
Output
$5.00
5.0× cheaper
Claude Opus 5
Input
$5.00
Output
$25.00
Claude Haiku 4.5 is cheaper on both — 5.0× input, 5.0× output
Writing DNA
Style Comparison
Similarity
45%
Claude Haiku 4.5 uses 11.9x more emoji
Claude Haiku 4.5
Claude Opus 5
61%Vocabulary54%
47wSentence Length21w
0.64Hedging0.40
5.1Bold3.9
6.3Lists1.9
0.20Emoji0.02
2.46Headings0.71
0.17Transitions0.05
Based on 24 + 27 text responses
Research
What we learned reading every model
FAQ
