benchlm.ai

GLM-4.5 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 28 (57 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GLM-4.5

CreatorTsinghua
TypeProprietary
Context128K
Score28

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

GLM-4.5

34.8

GPT-5.3 Codex

96

37
MMLU
99
36
GPQA
97
34
SuperGPQA
95
32
OpenBookQA
93

Coding

GPT-5.3 Codex

GLM-4.5

29

GPT-5.3 Codex

95

29
HumanEval
95

Mathematics

GPT-5.3 Codex

GLM-4.5

36

GPT-5.3 Codex

97.1

37
AIME 2023
99
39
AIME 2024
99
38
AIME 2025
98
33
HMMT Feb 2023
95
35
HMMT Feb 2024
97
34
HMMT Feb 2025
96
36
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

GLM-4.5

34

GPT-5.3 Codex

94

35
SimpleQA
95
33
MuSR
93

Frequently Asked Questions

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

GPT-5.3 Codex scores higher overall with 85 vs 28, a difference of 57 points across all benchmarks.

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

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 34.8.

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

GPT-5.3 Codex leads in coding with an average score of 95 vs 29.

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

GPT-5.3 Codex leads in math with an average score of 97.1 vs 36.

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

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 34.

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