GLM 5.3 Flash

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while reducing compute overhead.

ChatZhipu1M tokens$0.0818 / $0.2725 · 1M

z-ai/glm-5.3-flash

Context
1M tokens
Completion cap
131,072
Tools
Yes
JSON
Yes
Released
2026-08-26

Call it from Geek Hub

Same OpenAI SDK. Change the base URL and the model id.

curl https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer $GEEKHUB_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.3-flash",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GLM 5.3 Flash?
GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while reducing compute overhead. GLM 5.3 Flash runs on the Geek Hub API (OpenAI-compatible). Model id: z-ai/glm-5.3-flash.
Is GLM 5.3 Flash free?
No. Input is $0.0818 per 1M tokens and output is $0.2725 per 1M tokens on Geek Hub (markup included).
What is the context length of GLM 5.3 Flash?
GLM 5.3 Flash has a 1M tokens context window. It supports up to 131,072 completion tokens.
Does GLM 5.3 Flash support tool calling and structured outputs?
GLM 5.3 Flash accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
When was GLM 5.3 Flash released?
GLM 5.3 Flash was released on 2026-08-26.

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