ChatGPT-4o (March 2025) vs Z.ai: GLM 5.2
Compare ChatGPT-4o (March 2025) by OpenAI against Z.ai: GLM 5.2 by Zhipu AI, context windows of 128K vs 1.0M, tested across 32 shared challenges.
Our Verdict
Z.ai: GLM 5.2
ChatGPT-4o (March 2025)Runner-up
No community votes yet. On paper, Z.ai: GLM 5.2 has the edge — newer, bigger context window.
Z.ai: GLM 5.2 is 3.4x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Z.ai: GLM 5.2
Input
$1.40
3.6× cheaper
Output
$4.40
3.4× cheaper
Z.ai: GLM 5.2 is cheaper on both — 3.6× input, 3.4× output
Writing DNA
Style Comparison
Similarity
39%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
Z.ai: GLM 5.2
55%Vocabulary56%
24wSentence Length18w
0.52Hedging0.27
3.3Bold3.7
6.0Lists2.8
0.94Emoji0.00
0.63Headings0.56
0.05Transitions0.24
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
