GLM-5.3 Flash is Z.AI's fast, low-cost member of the GLM-5.3 family, and is natively multimodal — it accepts text, image, and video input and returns text. It is built for efficient coding and long-horizon agent tasks where throughput and price matter more than absolute peak capability.
A hybrid sparse and linear attention architecture keeps long-context behavior accurate across its 1M-token window, so it stays reliable on large codebases and document sets. Reasoning is always on with selectable effort levels, and native tool calling plus structured JSON output make it a strong pick for high-volume agentic workflows.
Capabilities
How to use
Tip: Give context and say what format you want the answer in.
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