GLM 4.5 Air (free)
GLM 4.5 Air (free) is a chat model from Z.ai, released July 25, 2025. GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. Like GLM-4.5, it adopts the Mixture-of-Experts (MoE) architecture but with a more compact parameter...
by Z.ai · 131K token context window
Best for
- low-latency chat and routing
- request routing and triage
- text classification
Ways to use GLM 4.5 Air (free) in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your Z.ai API key. osFoundry discovers GLM 4.5 Air (free) automatically — assign it to a Maestro role (router, direct, orchestrator, or fallback) in the Pipeline tab and it is live in every chat. Your key, your provider account — no token markup.
Use it in a Room App
Room Apps declare AI features in their manifest, then call them with invokeAI:
import { invokeAI } from '@osfoundry/app-sdk'
// 'summarize' is an AI feature declared in your app manifest.
const result = await invokeAI('summarize', userText)
Call it from your own apps
Once a model is wired into your workspace you can host it as an API and reach it from your own services, scripts, or CI — outside osFoundry.
Run GLM 4.5 Air (free) yourself
GLM 4.5 Air (free) is also available as open weights — self-host it for full data control and no per-token cost. See that page for GPU requirements and a cost comparison against API pricing.
GLM 4.5 Air (free) vs similar models
Licence
Hosted — usage subject to provider terms — Hosted-only model — usage governed by the provider's API terms. Bring your own provider key.
No weights distributed; usage subject to provider terms.
Frequently asked about GLM 4.5 Air (free)
How much does GLM 4.5 Air (free) cost?
GLM 4.5 Air (free) is metered at Free for input, and Free for output. Bring your own Z.ai API key — osFoundry passes through provider pricing without markup.
Can I use GLM 4.5 Air (free) commercially?
Commercial use is allowed with conditions. Hosted-only model — usage governed by the provider's API terms. Bring your own provider key. No weights distributed; usage subject to provider terms.
What is the context window of GLM 4.5 Air (free)?
GLM 4.5 Air (free) supports a 131K token context window.
Can I run GLM 4.5 Air (free) locally?
No — GLM 4.5 Air (free) is hosted only and accessed via the Z.ai API. An open-weights equivalent is available to self-host — see the cross-link above.
What is GLM 4.5 Air (free) best at?
GLM 4.5 Air (free) is well-suited to low-latency chat and routing, request routing and triage, text classification.
How do I use GLM 4.5 Air (free) in osFoundry?
Paste your Z.ai API key in the key dialog (or deploy the open weights for self-hostable models), assign GLM 4.5 Air (free) to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by Z.ai on July 25, 2025. Source: https://openrouter.ai/z-ai/glm-4.5-air:free