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Text modelsZ.ai

GLM-5.3-Flash: model overview

GLM-5.3 Flash from Z.ai accepts text and images and produces text. The developer reports 320 billion parameters, with 18 billion active per token. Reasoning effort is a separate choice: low, high, or max. The Flash name does not establish response time in a particular service.

External model reference page. This page does not confirm availability in Neiron.

Content updated:

Capabilities

Analyze an image together with a written question.

Explain code and draft technical material.

Choose reasoning effort in a supporting API.

Use cases

Use GLM-5.3-Flash when you need repository work, code repair, or a multi-step engineering task.Compare GLM-5.3-Flash with related GLM-5 models if the task allows a different input or output format.Before starting, confirm the input format and expected result (text, code, or an implementation plan).

Reviewed facts

Developer
Z.ai
Purpose
Language model, Vision, Coding, Reasoning
Input
Text, Images
Output
Text
Verified
2026-09-15

Benchmarks

No comparable benchmark is recorded in this card.

Sources

What to verify before use

Multimodal input means image understanding, not generation of a new image.
Reproducing published evaluations requires max effort and the stated environment; a chat session is not that evaluation setup.
Weights license: MIT. Check the developer repository for the applicable terms.

Prompts

These are example briefs for your own evaluation, not test results. A reference page does not imply Neiron access to the model.

Prompt example

Compare this diagram with the process description. Separate visible stages, contradictions, and details that cannot be determined from the image.

Prompt example

This function sometimes drops the final value. Propose a minimal reproducing input and one test; do not claim to have executed the program.

Prompt example

Turn these notes into an API description. Preserve field names, separate required and optional parameters, and mark unknowns.

FAQ

What can GLM-5.3-Flash be used for?

GLM-5.3 Flash from Z.ai accepts text and images and produces text. The developer reports 320 billion parameters, with 18 billion active per token. Reasoning effort is a separate choice: low, high, or max. The Flash name does not establish response time in a particular service.

How do I distinguish variants and capabilities?

Flash is a separate multimodal model. A GLM-5.3 score must not be attributed to Flash; check the exact variant and reasoning mode in the source table.

How should I compare outputs on my own task?

Use the same source material and prompt. Write down which facts or details must be preserved. The examples on this page are evaluation briefs, not results of a Neiron test.