GLM 5 Turbo vs GPT-5.5
Compare GLM 5 Turbo by Z-ai against GPT-5.5 by OpenAI, context windows of 203K vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-5.5
GLM 5 TurboRunner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier, newer, bigger context window, major provider backing.
GLM 5 Turbo is 9.4x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GLM 5 Turbo
Input
$0.96
5.2× cheaper
Output
$3.20
9.4× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
GLM 5 Turbo is cheaper on both — 5.2× input, 9.4× output
Writing DNA
Style Comparison
Similarity
38%
GLM 5 Turbo uses 4.9x more transitions
GLM 5 Turbo
GPT-5.5
54%Vocabulary58%
18wSentence Length18w
0.24Hedging0.74
4.0Bold2.9
3.0Lists5.1
0.00Emoji0.00
0.72Headings1.68
0.17Transitions0.03
Based on 23 + 26 text responses
Research
What we learned reading every model
FAQ
