GLM 5 Turbo vs GPT-5.3-Codex
Compare GLM 5 Turbo by Z-ai against GPT-5.3-Codex by OpenAI, context windows of 203K vs 400K, tested across 53 shared challenges.
Our Verdict
GPT-5.3-Codex
GLM 5 TurboRunner-up
No community votes yet. On paper, GPT-5.3-Codex has the edge — bigger model tier, bigger context window, major provider backing.
GLM 5 Turbo is 4.4x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GLM 5 Turbo
Input
$0.96
1.8× cheaper
Output
$3.20
4.4× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00
GLM 5 Turbo is cheaper on both — 1.8× input, 4.4× output
Writing DNA
Style Comparison
Similarity
24%
GPT-5.3-Codex uses 15.8x more emoji
GLM 5 Turbo
GPT-5.3-Codex
54%Vocabulary65%
18wSentence Length23w
0.24Hedging0.51
4.0Bold6.5
3.0Lists6.2
0.00Emoji0.16
0.72Headings1.90
0.17Transitions0.03
Based on 23 + 23 text responses
Research
What we learned reading every model
FAQ
