Claude Haiku 4.5 vs Z.ai: GLM 5.1
Compare Claude Haiku 4.5 by Anthropic against Z.ai: GLM 5.1 by Z-ai, context windows of 200K vs 203K, tested across 52 shared challenges.
Our Verdict
Claude Haiku 4.5
Z.ai: GLM 5.1
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
Claude Haiku 4.5
Input
$1.00
1.4× cheaper
Output
$5.00
Z.ai: GLM 5.1
Input
$1.40
Output
$4.40
1.1× cheaper
Claude Haiku 4.5 wins input (1.4× cheaper)·Z.ai: GLM 5.1 wins output (1.1× cheaper)
Writing DNA
Style Comparison
Similarity
31%
Claude Haiku 4.5 uses 20.4x more emoji
Claude Haiku 4.5
Z.ai: GLM 5.1
61%Vocabulary54%
47wSentence Length18w
0.64Hedging0.31
5.1Bold3.6
6.3Lists2.6
0.20Emoji0.00
2.46Headings0.43
0.17Transitions0.11
Based on 24 + 27 text responses
Research
What we learned reading every model
FAQ
