GLM-5.2 vs GPT-5.3-Codex

GLM-5.2 leads in 2 of 8 categories

Arena ELO

Tie

Cheaper

GLM-5.2

Faster

Tie

Detailed Comparison

Category	GLM-5.2	GPT-5.3-Codex
Provider	Z.ai	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$1.4 WIN	$1.75
Output Price ($/1M)	$4.4 WIN	$14
Arena ELO	N/A	N/A
Coding	N/A	N/A
Reasoning	N/A	N/A
Speed (tokens/sec)	N/A	N/A
Open Source	Yes	No

Frequently Asked Questions

Which is cheaper, GLM-5.2 or GPT-5.3-Codex?

GLM-5.2 is approximately 63% cheaper than GPT-5.3-Codex per million tokens.

Which has a larger context window?

GLM-5.2 supports 128K context, while GPT-5.3-Codex supports 128K.

Is GLM-5.2 or GPT-5.3-Codex open source?

GLM-5.2 is open source. GPT-5.3-Codex is proprietary.

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