Name: zai-org/GLM-5.2
Author: zai-org

Question 1

What does this zai-org/GLM-5.2 vs GPT-5.1 comparison cover?

Accepted Answer

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

Question 2

Which is cheaper: zai-org/GLM-5.2 or GPT-5.1?

Accepted Answer

zai-org/GLM-5.2 lists $1.40 input and $4.40 output per 1M tokens. GPT-5.1 lists $1.25 input and $10.00 output. The cheaper workload depends on the mix of input and output. Long-context tiers, caching, batch processing and retries can change the bill.

Question 3

Which has the larger context window: zai-org/GLM-5.2 or GPT-5.1?

Accepted Answer

zai-org/GLM-5.2 lists 1M tokens and GPT-5.1 lists 400K. zai-org/GLM-5.2 therefore has the larger recorded context window, but capacity alone is not a quality score.

Question 4

Which is faster: zai-org/GLM-5.2 or GPT-5.1?

Accepted Answer

There is no matched speed measurement for both models with the same source, host, region and date. Test the same prompts at your expected concurrency and measure time to the first useful response as well as complete task time.

Question 5

What input and output types do zai-org/GLM-5.2 and GPT-5.1 support?

Accepted Answer

zai-org/GLM-5.2 records text input and text output. GPT-5.1 records text, image input and text output. “Not documented” means the current source record is incomplete; it does not prove that a modality is unsupported.

Question 6

Should I choose zai-org/GLM-5.2 or GPT-5.1?

Accepted Answer

Consider zai-org/GLM-5.2 if you need larger context or larger maximum output or a lower listed output rate. Consider GPT-5.1 if you need a lower listed input rate. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Specification	zai-org/GLM-5.2	GPT-5.1
Provider	zai-org	OpenAI
Listed pricing route	zai-org	OpenAI
Model family	—	gpt
Accepted inputs	text	text, image
Produced outputs	text	text
Context window	1MHigher	400K
Max output	131.07KHigher	128K
Input price / 1M	$1.40	$1.25Lower
Output price / 1M	$4.40Lower	$10.00
Reasoning mode	Documented	Documented
Tool calling	Documented	Documented
Image input	Not documented	Documented
Audio input	Not documented	Not documented
Structured output	Not documented	Documented
License	Not documented	Proprietary

zai-org/GLM-5.2 vs GPT-5.1

zai-org/GLM-5.2

GPT-5.1

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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