free-ai-api-keys

z-ai/glm-5.3-flashx

Z.ai: GLM 5.3 FlashX

Context length
1049K
Input / 1M tokens
$0.37
Output / 1M tokens
$1.25
Released
2026-09-18
Modality
text+image+video->text

About Z.ai: 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...

Call Z.ai: GLM 5.3 FlashX

Via OpenRouter: one base URL for every provider.

curl https://openrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $OPENROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "z-ai/glm-5.3-flashx",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Direct on Zhipu / Z.ai (GLM):

curl https://api.z.ai/api/paas/v4/chat/completions \
  -H "Authorization: Bearer $ZHIPU_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "glm-5.3-flashx",
    "messages": [{"role": "user", "content": "Say hello"}]
  }'

Zhipu / Z.ai (GLM) keys

OpenRouter keys

OpenRouter keys work for z-ai/glm-5.3-flashx regardless of the upstream provider.