Z.ai: GLM 5.1 — pricing & benchmarks

By z-ai · Updated 2026-10-06 · Open weights · mitstep-by-step reasoningopen weights / self-hostable

What Z.ai: GLM 5.1 is used for

Z.ai: GLM 5.1 is best suited for step-by-step reasoning, open weights / self-hostable. Access it through one Appmo API key alongside 458 other models — Appmo's optimizer can route to it automatically when it is the best value for a request. Weights: huggingface.co/zai-org/GLM-5.1.

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"z-ai/glm-5.1","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does Z.ai: GLM 5.1 cost?
Z.ai: GLM 5.1 costs $1.4 per 1M input tokens and $4.4 per 1M output tokens ($2.15 blended), as of 2026-10-06. Prices are expected to fall as competition increases.

What is Z.ai: GLM 5.1 best for?
Z.ai: GLM 5.1 is best suited for step-by-step reasoning, open weights / self-hostable.

How do I use Z.ai: GLM 5.1?
Send requests to Appmo's OpenAI-compatible endpoint with model id "z-ai/glm-5.1" and one API key — no separate provider account needed.

Is Z.ai: GLM 5.1 open source?
Yes — its weights are public on Hugging Face (zai-org/GLM-5.1) under the mit license; check the license terms before commercial use.

Can Z.ai: GLM 5.1 create images?
No, Z.ai: GLM 5.1 works with text.