Is GLM 5.3 FlashX Legal available on FastMetal?

Not at the moment. GLM 4.7, from the same lab, is available on the FastMetal API today.

What is the context window of GLM 5.3 FlashX Legal?

1,048,576 tokens, shared between the prompt and the response.

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Z.ai

z-ai/glm-5-3-flashx-legal

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GLM 5.3 FlashX Legal

GLM-5.3-FlashX-Legal (GLM-Legal) is Z.ai's legal-domain variant of GLM-5.3-FlashX, a native multimodal model that accepts text, image, and video input and produces text. It adds legal-domain mid-training and post-training with reinforcement...

11/2/2026

1,048,576 tokens

Specifications

Modalities

Input

text

image

video

Output

text

Supported Parameters

include_reasoning

max_tokens

reasoning

reasoning_effort

response_format

structured_outputs

temperature

tool_choice

tools

top_k

top_p

Max Output Tokens

131,072

Reasoning Configuration

Default: Thinking on (effort: max)
Selectable effort levels: max
high
low
Turning thinking off: Not possible (always thinks)

How to control thinking, and what it costs

Data policy

Prompt retention: Unknown: we could not confirm
Training: Unknown: not declared

"Unknown" does not mean "safe". It means we could not confirm it.

Whether a provider trains on prompts is a declared value from our terms with them. Retention is determined from the upstream listing for every host this model can reach. Neither is guessed.

Frequently asked questions

Is GLM 5.3 FlashX Legal available on FastMetal?: Not at the moment. GLM 4.7, from the same lab, is available on the FastMetal API today.
What is the context window of GLM 5.3 FlashX Legal?: 1,048,576 tokens, shared between the prompt and the response.

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