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

Z.ai: GLM 5.1

z-ai/glm-5.1

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

Changes · 19 entries
z-ai/glm-5.1updateca7a400Nov 2, 2026, 03:02 AM
context_window202752→204800
pricinginput$1.05→$1.4output$3.5→$4.4cached input$0.525→$0.26
max_output_tokens65535→131072
z-ai/glm-5.1update4e8b6afOct 21, 2026, 06:35 AM
pricinginput$0.966→$1.4output$3.036→$4.4cached input$0.179→$0.26
max_output_tokens128000→131072
z-ai/glm-5.1updateb92059eOct 15, 2026, 06:37 AM
pricinginput$1.33→$0.966output$4.18→$3.036cached input$0.247→$0.179
max_output_tokens131072→128000
z-ai/glm-5.1update0d5a9a1Oct 14, 2026, 06:38 AM
pricinginput$0.966→$1.33output$3.036→$4.18cached input$0.179→$0.247
max_output_tokens128000→131072
z-ai/glm-5.1updateb61df6aOct 7, 2026, 06:39 AM
pricinginput$1.4→$0.966output$4.4→$3.036cached input$0.26→$0.179
max_output_tokens131072→128000
z-ai/glm-5.1update02333c9Oct 3, 2026, 06:38 AM
pricinginput$0.965→$1.4output$3.032→$4.4cached input$0.179→$0.26
z-ai/glm-5.1update8c801e2Oct 1, 2026, 06:40 AM
pricinginput$1.4→$0.965output$4.4→$3.032cached input$0.26→$0.179
z-ai/glm-5.1updatef41f4c4Sep 28, 2026, 06:53 AM
pricinginput$0.965→$1.4output$3.032→$4.4cached input$0.179→$0.26
z-ai/glm-5.1update99b2555Sep 25, 2026, 06:38 AM
pricinginput$0.966→$0.965output$3.036→$3.032
max_output_tokens128000→131072
z-ai/glm-5.1updatebe35184Aug 17, 2026, 04:02 AM
pricinginput$1.4→$0.966output$4.4→$3.036cached input$0.26→$0.179
max_output_tokens131072→128000
z-ai/glm-5.1update3cddff5Aug 13, 2026, 02:54 AM
pricinginput$0.966→$1.4output$3.036→$4.4cached input$0.179→$0.26
max_output_tokens128000→131072
z-ai/glm-5.1updatebf78dcfJul 25, 2026, 05:49 AM
context_window202752→204800
z-ai/glm-5.1update53ef452Jul 9, 2026, 02:32 AM
pricinginput$0.98→$0.966output$3.08→$3.036cached input$0.182→$0.179
max_output_tokens131072→128000
z-ai/glm-5.1updated657a45Jun 3, 2026, 03:19 AM
max_output_tokens65535→131072
z-ai/glm-5.1update73d11c6May 18, 2026, 03:39 AM
pricinginput$1.05→$0.98output$3.5→$3.08cached input$0.525→$0.182
z-ai/glm-5.1update80802beApr 22, 2026, 02:56 PM
pricinginput$0.698→$1.05output$4.4→$3.5cached input$0.26→$0.525
max_output_tokens131072→65535
z-ai/glm-5.1update6231fb5Apr 22, 2026, 02:50 AM
pricinginput$0.95→$0.698output$3.15→$4.4cached input$0.475→$0.26
max_output_tokens65535→131072
z-ai/glm-5.1update14e5cfdApr 13, 2026, 02:40 AM
pricinginput$1.26→$0.95output$3.96→$3.15cached input$0.475
max_output_tokens65535
z-ai/glm-5.1create5c578c7Apr 8, 2026, 03:30 PM