Z.ai: GLM 5.1 vs Sonar Pro Search
Compare Z.ai: GLM 5.1 by Z-ai against Sonar Pro Search by Perplexity, context windows of 203K vs 200K, tested across 51 shared challenges.
Our Verdict
Z.ai: GLM 5.1
Sonar Pro Search
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Z.ai: GLM 5.1 is 3.4x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Z.ai: GLM 5.1
Input
$1.40
2.1× cheaper
Output
$4.40
3.4× cheaper
Sonar Pro Search
Input
$3.00
Output
$15.00
Z.ai: GLM 5.1 is cheaper on both — 2.1× input, 3.4× output
Writing DNA
Style Comparison
Similarity
41%
Sonar Pro Search uses 4.8x more headings
Z.ai: GLM 5.1
Sonar Pro Search
54%Vocabulary60%
18wSentence Length22w
0.31Hedging0.30
3.6Bold2.7
2.6Lists2.6
0.00Emoji0.00
0.43Headings2.08
0.11Transitions0.07
Based on 27 + 25 text responses
Research
What we learned reading every model
FAQ
