> GLM-4.5-Air is an open-weights AI model from Zhipu, released 20 Jul 2025. API price $0.13 in / $0.85 out per million tokens, 131K context.

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# GLM-4.5-Air

Zhipu

Released 20 Jul 2025

Open

[Compare](https://themodelindex.org/compare/glm-4-5-air-vs-gpt-5/)

–

Index score

Not yet evaluated independently

1/ 8

Core tests taken

1 of 6 areas · plus 0 anchor tests

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Versus the frontier at release

$0.13/ $0.85

Price per million tokens

input / output, list price

131K

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_

o1-mini reached this score 10 months earlier.

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

Reasoning & knowledge

evidence

GPQA Diamond

no result

Humanity's Last Exam

8%

Maths

no evidence yet

FrontierMath T1-3

no result

Coding

no evidence yet

SWE-bench Verified

no result

Terminal-Bench

no result

Agents

no evidence yet

APEX-Agents

no result

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

LMArena · Maths

maths questions in chat

#158

of 373 · 1387

LMArena · Coding

coding questions in chat

#166

of 383 · 1427

LMArena · Text

overall chat quality, judged by people

#172

of 388 · 1373

LMArena · Creative writing

creative writing

#182

of 386 · 1327

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

Not in the top three among current models on any category we track.

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 · 3 · per million tokens, in / out

N

Novita

$0.13 / $0.85 · bf16

cheapest

S

SiliconFlow

$0.14 / $0.86 · fp8

↗

Z

Z.AI

$0.20 / $1.1 · fp8

↗

#### Run it yourself

🤗

Official weights

zai-org/GLM-4.5-Air

↗

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

20 Jul 2025

Announcement

not linked yet

Release entry

–

Scored as

GLM-4.5-Air

Artificial Analysis index

–

Output speed

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Hugging Face

[zai-org/GLM-4.5-Air ↗](https://huggingface.co/zai-org/GLM-4.5-Air)

## Zhipu releases · around this one

ChatGLM-6B

Open

14 MAR 2023

GLM-4

Closed

16 JAN 2024

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Source: https://themodelindex.org/models/glm-4-5-air/ · The Model Index · data as of 2026-10-01