> GLM-5.1 is an open-weights AI model from Zhipu, released 7 Apr 2026. Index score 153 (GPT-4 = 100), rank 53 of 229 ranked models. API price $0.96 in / $3.03 out per million tokens, 205K context.

[Models](https://themodelindex.org/models/) /[Zhipu](https://themodelindex.org/labs/zhipu/)

# GLM-5.1

Zhipu

Released 7 Apr 2026

Open

[Compare](https://themodelindex.org/compare/glm-5-1-vs-gpt-5-5/) [Announcement](https://huggingface.co/zai-org/GLM-5.1)

153141–164

Index score

#53 of 229 models

4/ 8

Core tests taken

4 of 6 areas · plus 8 anchor tests

−18

Versus the frontier at release

best then: GPT-5.4

Replaced by [GLM-5.2](https://themodelindex.org/models/glm-5-2/)

$0.96/ $3.03

Price per million tokens

input / output, list price

205K

Context window

tokens it reads at once

## Where it sits · on the frontier

_Chart: Model Index score of every scored model since late 2022, with the best closed and best open model over time_

GPT-5 reached this score 8 months earlier.

## Test results · by area · tick = best by any model

Show 7 anchor tests

Reasoning & knowledge

evidence

GPQA Diamond

90%

Humanity's Last Exam

no result

Maths

evidence

FrontierMath T1-3

37%

Coding

evidence

SWE-bench Verified

74%

Terminal-Bench

no result

Agents

evidence

APEX-Agents

41%

Novel problems

no evidence yet

ARC-AGI-2

no result

Long tasks

no evidence yet

METR time horizon

no result

Independent results from the Epoch AI benchmarking hub, best reasoning setting. The core tests are shown here; anchor tests also inform the score and can be shown above.

## What others say · rank on each leaderboard

The Model Index

independent tests, our method

#53

of 219 · 153

LMArena · Creative writing

creative writing

#40

of 386 · 1447

LMArena · Maths

maths questions in chat

#39

of 373 · 1475

LMArena · Coding

coding questions in chat

#47

of 383 · 1513

LMArena · Text

overall chat quality, judged by people

#49

of 388 · 1465

Epoch Capabilities Index

overall capability from many benchmarks

#51

of 239 · 149.9

LMArena · WebDev

building web apps and front ends

#49

of 123 · 1508

Further left is better. Leaderboards measure different things: LMArena is people voting blind between two answers, the others are test scores. Click any row for the source.

## Best at · top three among current models

3rd

SWE-bench Verified

Epoch AI · independent

Where this model places in the top three of today's models, on category leaderboards and on our core tests.

## Where to use it · prices checked 1 Oct 2026

#### From the lab

Z.ai Chat

app · subscription

↗

Z.ai API

API

↗

#### API providers · 14 · per million tokens, in / out

B

Baidu

$0.96 / $3.03 · fp8

cheapest

S

StreamLake

$0.97 / $3.04 · fp8

↗

C

Chutes

$0.98 / $3.08 · fp8

↗

D

DeepInfra

$1.05 / $3.5 · fp4

↗

S

SiliconFlow

$1.19 / $3.74 · fp8

↗

A

AtlasCloud

$1.26 / $3.96 · fp8

↗

P

Phala

$1.21 / $4.2

↗

A

Alibaba

$1.33 / $4.18 · fp8

↗

#### Run it yourself

🤗

Official weights

zai-org/GLM-5.1

↗

Provider prices come from OpenRouter's live listing; going direct to a provider can differ. Subscriptions are the lab's own apps.

## Facts and sources

Released

7 Apr 2026

Announcement

[huggingface.co ↗](https://huggingface.co/zai-org/GLM-5.1)

Release entry

GLM-5.1

Scored as

GLM-5.1

Artificial Analysis index

–

Output speed

–

Hugging Face

[zai-org/GLM-5.1 ↗](https://huggingface.co/zai-org/GLM-5.1)

## Zhipu releases · around this one

GLM-4.7

Open

22 DEC 2025

index 139

GLM-5

Open

11 FEB 2026

index 144

GLM-5.1

Open

7 APR 2026

index 153

GLM-5.2

Open

16 JUN 2026

index 158

GLM-5.3

Open

14 AUG 2026

index 167

---
Source: https://themodelindex.org/models/glm-5-1/ · The Model Index · data as of 2026-10-01