GLM-5.3 Flash Free API

Call GLM-5.3 Flash Free

Set the model to glm-5.3-flash-free in any OpenAI- or Anthropic-compatible client. Both base URLs accept the same apmix key.

curl https://api.apmix.ai/v1/chat/completions \
  -H "Authorization: Bearer apx_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "glm-5.3-flash-free", "messages": [{"role": "user", "content": "Hello"}]}'

curl https://api.apmix.ai/v1/messages \
  -H "x-api-key: apx_live_YOUR_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{"model": "glm-5.3-flash-free", "max_tokens": 1024, "messages": [{"role": "user", "content": "Hello"}]}'

Questions about GLM-5.3 Flash Free

Is GLM-5.3 Flash Free free on apmix?

Yes. Every new account gets 2M free tokens that can be spent on GLM-5.3 Flash Free (glm-5.3-flash-free) and the other free models, with no daily limit and no expiry date. No card needed.

Which plan includes GLM-5.3 Flash Free?

Starter, Pro, Max. Each plan is a monthly allowance of weighted tokens shared across every model and every key; GLM-5.3 Flash Free counts at 1.5× per token.

How do I use GLM-5.3 Flash Free in Claude Code, Codex CLI or Cursor?

Point the tool at apmix — https://api.apmix.ai/v1 for OpenAI-compatible clients, https://api.apmix.ai for Anthropic-compatible ones — with your apmix key, and set the model to glm-5.3-flash-free. The Docs page has copy-paste setup for each tool.

More Z.ai (GLM) models

• GLM-5.3 Flash
• GLM-5.3
• GLM-5.2
• GLM-5 Turbo