Claude 3.7 Sonnet vs Z.ai: GLM 5.1
Compare Claude 3.7 Sonnet by Anthropic against Z.ai: GLM 5.1 by Z-ai, in 7 community votes, z.ai: glm 5.1 wins 83% of head-to-head duels, context windows of 200K vs 203K, tested across 53 shared challenges.
Reasoning: Z.ai: GLM 5.1 wins 75% of votes
Image Generation: Z.ai: GLM 5.1 wins 100% of votes
Our Verdict
Z.ai: GLM 5.1Winner
Claude 3.7 SonnetRunner-up
Pick Z.ai: GLM 5.1. In 7 blind votes, Z.ai: GLM 5.1 wins 83% of the time. That's not luck.
Z.ai: GLM 5.1 particularly excels in Image Generation, Reasoning. Z.ai: GLM 5.1 is 3.4x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude 3.7 Sonnet
Input
$3.00
Output
$15.00
Z.ai: GLM 5.1
Input
$1.40
2.1× cheaper
Output
$4.40
3.4× cheaper
Z.ai: GLM 5.1 is cheaper on both — 2.1× input, 3.4× output
Writing DNA
Style Comparison
Similarity
39%
Claude 3.7 Sonnet uses 4.1x more headings
Claude 3.7 Sonnet
Z.ai: GLM 5.1
62%Vocabulary54%
35wSentence Length18w
0.99Hedging0.31
1.2Bold3.6
4.3Lists2.6
0.00Emoji0.00
1.78Headings0.43
0.23Transitions0.11
Based on 13 + 27 text responses
Research
What we learned reading every model
FAQ
