GLM-5.1 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-5.1",
    "messages": [{"role": "user", "content": "Reply with OK"}]
  }'

Using it from a coding client

200K covers most single-repository work in Cline or Claude Code without chunking. For a cheap second opinion on the same diff, the coding-tagged MiniMax models run at a fraction of this rate.

• Run it in Cline
• Run it in Claude Code

How it compares within its family

GLM-5.1 shares its 200K window with GLM-5 and carries the coding tag where GLM-5 carries agent. It lists at $1.15 per million input tokens and $4.00 output, a little above the $1.00 and $3.20 of GLM-5, and a little under the $1.40 and $4.40 that GLM-5.2 and GLM-5.3 both list. What the extra money does not buy is context: 5.1 stays at 200K while 5.2 and 5.3 reach 1M. That makes 5.1 the pick when the work is code, the repository fits, and you would rather not pay 1M rates for a window you will not fill. Once sessions start spilling past 200K, GLM-5.3 is the next step rather than another round of prompt trimming.

Other models on this platform

• GLM-5200K
• GLM-5.21M
• GLM-5.31M
• GLM-5.3 Flash1M

Questions