GLM-5.3 Flash API: pricing, base URL and quick setup

Specifications and pricing

Prices synced with platform billing (USD per 1M tokens).

Quick setup

curl https://a2agent.me/v1/chat/completions \
  -H "content-type: application/json" \
  -H "authorization: Bearer sk-your-a2agent-key" \
  -d '{
    "model": "glm-5.3-flash",
    "messages": [{"role": "user", "content": "Reply with OK"}]
  }'

Using it from a coding client

Good as the fast tier in a two-model setup: Flash does the reading, GLM-5.3 does the writing. Most clients let you set a different model per profile, so the switch is one string.

• Run it in Cline
• Run it in Kilo Code

How it compares within its family

GLM-5.3 Flash is the low-cost member of the GLM line: $0.15 per million input tokens and $0.50 output, against $1.40 and $4.40 for GLM-5.3 proper. It keeps the full 1M window, so the saving costs you no context, and it is the only Z.ai model here tagged for vision. That combination suits work that is wide but shallow. Reading long documents, sorting screenshots, first-pass triage before a stronger model sees what survives. The GLM models tagged for coding are 5.1, 5.2 and 5.3; Flash is not one of them, and long code-writing sessions are where a cheaper token stops paying for itself. Within Z.ai it is the lowest rate on both sides by a wide margin.

Other models on this platform

• GLM-5200K
• GLM-5.1200K
• GLM-5.21M
• GLM-5.31M

Questions