benchlm.ai

GLM-4.5-Air vs GPT-5.3 Codex

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

GPT-5.3 Codex wins overall with a score of 85 vs 26 (59 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GLM-4.5-Air

CreatorTsinghua
TypeProprietary
Context128K
Score26

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

GLM-4.5-Air

32.8

GPT-5.3 Codex

96

35
MMLU
99
34
GPQA
97
32
SuperGPQA
95
30
OpenBookQA
93

Coding

GPT-5.3 Codex

GLM-4.5-Air

27

GPT-5.3 Codex

95

27
HumanEval
95

Mathematics

GPT-5.3 Codex

GLM-4.5-Air

34

GPT-5.3 Codex

97.1

35
AIME 2023
99
37
AIME 2024
99
36
AIME 2025
98
31
HMMT Feb 2023
95
33
HMMT Feb 2024
97
32
HMMT Feb 2025
96
34
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

GLM-4.5-Air

32

GPT-5.3 Codex

94

33
SimpleQA
95
31
MuSR
93

Frequently Asked Questions

Which is better, GLM-4.5-Air or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 26, a difference of 59 points across all benchmarks.

Which is better for knowledge tasks, GLM-4.5-Air or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 32.8.

Which is better for coding, GLM-4.5-Air or GPT-5.3 Codex?

GPT-5.3 Codex leads in coding with an average score of 95 vs 27.

Which is better for math, GLM-4.5-Air or GPT-5.3 Codex?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 34.

Which is better for reasoning, GLM-4.5-Air or GPT-5.3 Codex?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 32.

Related Comparisons

GLM-4.5-Air vs GPT-5.4GLM-4.5-Air vs Gemini 3.1 ProGLM-4.5-Air vs Claude Opus 4.6GLM-4.5-Air vs Grok 4.1GLM-4.5-Air vs GPT-5.2GLM-4.5-Air vs GPT-5.2-Codex