Z.ai: GLM 5.1

GLM-5.1 delivers a major leap in coding capability, with particularly significant gains in handling long-horizon tasks.

Context
205K
Max output
131K
Input price
$1.4/1M tokens
Output price
$4.4/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode

Details

Model IDz-ai/glm-5.1
Provider OpenRouter
Creator z-ai
Familyglm-5.1
License—
Status—
Typechat
Input modalitiestext
Output modalitiestext
Open weight—
Parameters—
Architecture—
Context window205K tokens
Max input—
Max output131K tokens
Reasoning tokens—
Knowledge cutoff—
Release date
Sourceofficial

Tools

Function Callingfunction_calling
Call external functions and APIs

Pricing

Input
$1.4
Output
$4.4
Cache write
—
Cache read
$0.26
Batch in
—
Batch out
—

API

GET/v1/models/openrouter/z-ai/glm-5.1