GLM 5.3 Flash

Z.ai· released 26 Aug 2026

z-ai/glm-5.3-flash

Input / 1M tokens: $0.15
Output / 1M tokens: $0.5

Context window1M tokens

Longest answer: 944K tokens

reads textreads imagereads videoopen weightstool callingvisionreasoning

About

GLM 5.3 Flash is a Z.ai native multimodal model aimed at efficient coding and long-horizon agent tasks. It accepts text, images, and video, and returns text. The model supports vision, tools, and reasoning, with a context window of 1,048,576 tokens and a maximum output of 943,717 tokens. It is listed at $0.15 USD per 1M input tokens and $0.5 USD per 1M output tokens. Its model ID is z-ai/glm-5.3-flash, and its Hugging Face ID is zai-org/GLM-5.3-Flash. Open weights are listed. Z.ai lists its release and creation date as 2026-08-26. For stack decisions, the combination of video input, tool support, and a context window above one million tokens distinguishes its stated scope; output is text. The listed pricing separates input and output token rates.

Who it is for

It suits teams working on coding and long-running agent tasks that can use text, image, or video inputs. Open weights and tool support may matter to builders evaluating model integration options.

What is good

Accepts text, image, and video inputs
Open weights are listed
1,048,576-token context window
Tool support and reasoning are listed

What to know first

Output is text only
Output costs $0.5 USD per 1M tokens

Verdict

GLM 5.3 Flash pairs multimodal inputs and open weights with a large context window. Its listed prices are $0.15 USD per 1M input tokens and $0.5 USD per 1M output tokens.

Details

Lab: Z.aiopenrouter.ai · 3 Oct 2026
Context: 1,049Kopenrouter.ai · 3 Oct 2026
Input price: $0.15 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $0.5 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 943,717 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, image, videoopenrouter.ai · 3 Oct 2026
Open weights: Yesopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/z-ai/glm-5.3-flash· checked 3 Oct 2026