GLM 5.3 FlashX

GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s. Built on the same hybrid sparse and linear attention architecture (320B total parameters, 18B active), it is suited for efficient coding, visual understanding, and long-horizon agent tasks with a 1M-token context window.

ChatZhipu1M tokens$0.4033 / $1.3626 · 1M

z-ai/glm-5.3-flashx

Context
1M tokens
Completion cap
131,072
Tools
Yes
JSON
Yes
Released
2026-09-18

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-flashx",
    "messages": [{"role": "user", "content": "Hola"}]
  }'
Get an API key

Frequently asked questions

What is GLM 5.3 FlashX?
GLM-5.3-FlashX is the high-speed variant of Z.ai's GLM-5.3-Flash, a native multimodal model delivering inference speeds of up to 200 tokens/s. Built on the same hybrid sparse and linear attention architecture (320B total parameters, 18B active), it is suited for efficient coding, visual understanding, and long-horizon agent tasks with a 1M-token context window. GLM 5.3 FlashX runs on the Geek Hub API (OpenAI-compatible). Model id: z-ai/glm-5.3-flashx.
Is GLM 5.3 FlashX free?
No. Input is $0.4033 per 1M tokens and output is $1.3626 per 1M tokens on Geek Hub (markup included).
What is the context length of GLM 5.3 FlashX?
GLM 5.3 FlashX has a 1M tokens context window. It supports up to 131,072 completion tokens.
Does GLM 5.3 FlashX support tool calling and structured outputs?
GLM 5.3 FlashX 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 FlashX released?
GLM 5.3 FlashX was released on 2026-09-18.

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