GLM-5.3 Flash API
GLM-5.3-Flash is Zhipu's low-cost native multimodal model: 320B total parameters, 18B active, a hybrid sparse/linear attention design, and open-source frontier positioning. The FlashX variant is specified at up to 200 tokens/s.
Official source: model page · verified 2026-10-22
Pricing
Prices can change with upstream providers; the rate at settlement is authoritative.
Call the API
Use the OpenAI-compatible endpoint; no model-specific SDK setup is required.
curl https://api.kimiseek.app/v1/chat/completions \
-H "Authorization: Bearer $KIMISEEK_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "glm-5.3-flash",
"messages": [{"role": "user", "content": "Hello from KimiSeek"}]
}'Where it fits
Best for
- Cost-sensitive multimodal coding and GUI work
- Visual feedback loops in code generation
- Office and document workflows
Tradeoffs
- Flash tier trades some capability for cost and speed
- For the full GLM-5.3 tier, compare the non-Flash model
Model details
FAQ
What makes GLM-5.3-Flash different?
It combines native image/video/text input with a 320B total / 18B active architecture, open-source positioning and a faster FlashX option.
Is it suitable for GUI agents?
The official page highlights visual coding and interaction with interfaces; evaluate it on your own GUI tasks.
How do I call this model?
Use KimiSeek's OpenAI-compatible API and set the model field to glm-5.3-flash with your KimiSeek API key.