benchlm.ai

GLM-5 (Reasoning) 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 75 (10 point difference).GPT-5.3 Codex wins 4 out of 4 categories.

GLM-5 (Reasoning)

CreatorZhipu AI
TypeOpen Weight
Context200K
Score75

GPT-5.3 Codex

CreatorOpenAI
TypeProprietary
Context400K
Score85

Knowledge

GPT-5.3 Codex

GLM-5 (Reasoning)

93

GPT-5.3 Codex

96

96
MMLU
99
94
GPQA
97
92
SuperGPQA
95
90
OpenBookQA
93

Coding

GPT-5.3 Codex

GLM-5 (Reasoning)

88

GPT-5.3 Codex

95

88
HumanEval
95

Mathematics

GPT-5.3 Codex

GLM-5 (Reasoning)

96.6

GPT-5.3 Codex

97.1

98
AIME 2023
99
99
AIME 2024
99
98
AIME 2025
98
94
HMMT Feb 2023
95
96
HMMT Feb 2024
97
95
HMMT Feb 2025
96
96
BRUMO 2025
96

Reasoning

GPT-5.3 Codex

GLM-5 (Reasoning)

91

GPT-5.3 Codex

94

92
SimpleQA
95
90
MuSR
93

Frequently Asked Questions

Which is better, GLM-5 (Reasoning) or GPT-5.3 Codex?

GPT-5.3 Codex scores higher overall with 85 vs 75, a difference of 10 points across all benchmarks.

Which is better for knowledge tasks, GLM-5 (Reasoning) or GPT-5.3 Codex?

GPT-5.3 Codex leads in knowledge tasks with an average score of 96 vs 93.

Which is better for coding, GLM-5 (Reasoning) or GPT-5.3 Codex?

GPT-5.3 Codex leads in coding with an average score of 95 vs 88.

Which is better for math, GLM-5 (Reasoning) or GPT-5.3 Codex?

GPT-5.3 Codex leads in math with an average score of 97.1 vs 96.6.

Which is better for reasoning, GLM-5 (Reasoning) or GPT-5.3 Codex?

GPT-5.3 Codex leads in reasoning with an average score of 94 vs 91.

Related Comparisons

GLM-5 (Reasoning) vs GPT-5.4GLM-5 (Reasoning) vs Gemini 3.1 ProGLM-5 (Reasoning) vs Claude Opus 4.6GLM-5 (Reasoning) vs Grok 4.1GLM-5 (Reasoning) vs GPT-5.2GLM-5 (Reasoning) vs GPT-5.2-Codex