GLM-5.2 vs GPT-5.5

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-5.5
Provider	Z.ai	OpenAI
Context Window	128K	128K
Input Price ($/1M)	$3 WIN	N/A
Output Price ($/1M)	$80 WIN	N/A
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 has a larger context window?

GLM-5.2 supports 128K context, while GPT-5.5 supports 128K.

Is GLM-5.2 or GPT-5.5 open source?

GLM-5.2 is open source. GPT-5.5 is proprietary.

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More Comparisons

GLM-5.2 vs Claude Opus 4.5 GLM-5.2 vs Llama 4 Scout GLM-5.2 vs Claude Sonnet 4.6 GLM-5.2 vs Claude Haiku 4.5 GLM-5.2 vs Qwen 3.6 GLM-5.2 vs GPT-4o GLM-5.2 vs DeepSeek R1 GLM-5.2 vs Claude Opus 4.6 GPT-5.5 vs Claude Opus 4.5 GPT-5.5 vs Llama 4 Scout GPT-5.5 vs Claude Sonnet 4.6 GPT-5.5 vs Claude Haiku 4.5 GPT-5.5 vs Qwen 3.6 GPT-5.5 vs GPT-4o GPT-5.5 vs DeepSeek R1 GPT-5.5 vs Claude Opus 4.6