Z.ai: GLM 5.2 vs GPT-5.1-Codex-Mini
Compare Z.ai: GLM 5.2 by Zhipu AI against GPT-5.1-Codex-Mini by OpenAI, context windows of 1.0M vs 400K, tested across 54 shared challenges.
Our Verdict
Z.ai: GLM 5.2
GPT-5.1-Codex-MiniRunner-up
No community votes yet. On paper, Z.ai: GLM 5.2 has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Z.ai: GLM 5.2
Input
$1.40
1.1× cheaper
Output
$4.40
1.4× cheaper
GPT-5.1-Codex-Mini
Input
$1.50
Output
$6.00
Z.ai: GLM 5.2 is cheaper on both — 1.1× input, 1.4× output
Writing DNA
Style Comparison
Similarity
50%
Z.ai: GLM 5.2 uses 7.2x more headings
Z.ai: GLM 5.2
GPT-5.1-Codex-Mini
56%Vocabulary65%
18wSentence Length20w
0.27Hedging0.56
3.7Bold3.3
2.8Lists3.4
0.00Emoji0.00
0.56Headings0.08
0.24Transitions0.05
Based on 27 + 13 text responses
Research
What we learned reading every model
FAQ
