Skip to content
CheapestInference

GLM 5.2 API — retired (upgraded to GLM 5.3)

GLM 5.2 was Zhipu AI’s (Z.ai) frontier open-source coding and reasoning model. It was served in the Frontier Pool until August 30, 2026, when the pool’s GLM slot was upgraded in place to GLM 5.3 — the same base model with extended post-training, at the same flat price. Frontier subscriptions were not interrupted and nothing changed on existing keys.

What this means

Section titled “What this means”
  • Requests with model: "glm-5.2" are served by GLM 5.3 until September 30, 2026. After that date the id returns an invalid-model error.
  • Frontier Pool subscriptions are unchanged: GLM 5.3 and MiniMax M3 remain served with no token caps.
  • GET /v1/models is always the authoritative live list.

Migrate in one line

Section titled “Migrate in one line”

Change the model id — the endpoint, key, and subscription stay the same:

from openai import OpenAI


client = OpenAI(
    base_url="https://api.cheapestinference.com/v1",
    api_key="sk-..."  # your subscriber key
)


response = client.chat.completions.create(
    model="glm-5.3",  # was "glm-5.2"
    messages=[{"role": "user", "content": "Write a unit test for..."}],
)
Terminal window
curl https://api.cheapestinference.com/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "glm-5.3", "messages": [{"role": "user", "content": "Hello"}]}'

Coding agents: set the model to glm-5.3 in your tool’s config — see GLM with Claude Code, Cline / Roo Code and OpenCode, Roo & Aider.

GLM 5.2 in brief (historical)

Section titled “GLM 5.2 in brief (historical)”
Model IDglm-5.2 (retired — use glm-5.3)
ServedFrontier Pool, until 2026-08-30
Context window198K tokens
Open weightsYes — zai-org/GLM-5.2, MIT license
SuccessorGLM 5.3 — same 753B base, scaled post-training, open-weighted under the GLM-5.3 License

Common questions

Section titled “Common questions”

Is there still a GLM 5.2 API? Not as a separate model. Requests for glm-5.2 are served by GLM 5.3 until September 30, 2026; use glm-5.3 going forward.

Do I lose anything with the upgrade? No — GLM 5.3 is the same base model with more post-training, at the same price and with a far larger context window as served here (1M tokens, against 198K for GLM 5.2). The upgrade was applied to every Frontier subscription automatically.

Is there a GLM coding plan? Yes — a Frontier Pool subscription works as a GLM coding plan: unlimited GLM 5.3 through Claude Code, Cline, Roo Code or any OpenAI-compatible coding agent, plus MiniMax M3 on the same subscription.

Section titled “Related”