GLM-5.1

deprecatedmit754B

GLM-5.1 is Z.AI’s latest flagship model, designed for long-horizon tasks. It can work continuously and autonomously on a single task for up to 8 hours, completing the full loop from planning and execution to iterative optimization and delivering production-grade results. \ \ In both general capability and coding performance, GLM-5.1 is overall aligned with Claude Opus 4.6. It demonstrates stronger sustained execution in long-horizon autonomous tasks, complex engineering optimization, and real...

Context
203K
Max output
128K
Input price
$1.4/1M tokens
Output price
$4.4/1M tokens

Capabilities

Reasoning & Interaction
Reasoning
Tool Calling
Output Control
Structured Output
JSON Mode
Infrastructure
Streaming
Prompt Caching
Fine-tuning

Details

Model IDzai-org/GLM-5.1
Provider Hugging Face
Creator Z.AI (Zhipu)
FamilyGLM-5.1
Licensemit
Statusdeprecated
Typechat
Input modalitiestext
Output modalitiestext
Open weightYes
Parameters754B
Architecturemoe
Context window203K tokens
Max input—
Max output128K 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
—

Family Comparison: GLM-5.1

ModelContextMax out
GLM-5.1-FP8203K—
GLM-5.1203K128K

API

GET/v1/models/huggingface/zai-org/GLM-5.1