Z.ai: GLM 5.1 vs GPT-5.1 Codex Max
Compare Z.ai: GLM 5.1 by Z-ai against GPT-5.1 Codex Max by OpenAI, tested across 51 shared challenges.
Our Verdict
GPT-5.1 Codex Max
Z.ai: GLM 5.1Runner-up
No community votes yet. On paper, GPT-5.1 Codex Max has the edge — bigger model tier, major provider backing.
Too close to call
API pricing
Cost per 1M tokens
Z.ai: GLM 5.1
Input
$1.40
Output
$4.40
GPT-5.1 Codex Max
Input
—
Output
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Writing DNA
Style Comparison
Similarity
65%
Z.ai: GLM 5.1 uses 4.0x more transitions
Z.ai: GLM 5.1
GPT-5.1 Codex Max
54%Vocabulary60%
18wSentence Length16w
0.31Hedging0.36
3.6Bold2.3
2.6Lists4.2
0.00Emoji0.00
0.43Headings0.12
0.11Transitions0.03
Based on 27 + 13 text responses
Research
What we learned reading every model
FAQ
