GLM 5.1 API: Pricing and Specs

GLM 5.1 API

GLM 5.1 is a large language model by Z.ai, available on the Venice API as zai-org-glm-5-1. It runs privately, with zero data retention.GLM-5.1, the successor to GLM-5, is a large language model developed by Z.ai, featuring significantly enhanced reasoning capabilities, improved instruction following, and support for multiple languages. Supports large context windows for processing extensive text and detailed analysis with fast inference speed.

GLM 5.1 API pricing

Model ID	Variant	Privacy	Price
`zai-org-glm-5-1`	Standard	Private	$1.54 / $4.84 per 1M

GLM 5.1 specifications

Spec	Value
Provider	Z.ai
Released	Apr 7, 2026
Privacy	Private
Status	Stable
Open weights	Yes
Context window	200K tokens
Max output	80K tokens
Reasoning effort	none, low, medium, high
Served precision	FP8

How to use the GLM 5.1 API

Send requests to POST https://api.venice.ai/api/v1/chat/completions with "model": "zai-org-glm-5-1" and your API key.

curl https://api.venice.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai-org-glm-5-1",
    "messages": [{ "role": "user", "content": "Explain TEE attestation in two sentences." }],
    "reasoning_effort": "low"
  }'

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GLM 5.1 API