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OpenRouter

GLM 4.5 Air (free) API

OpenRouter
About

Build advanced reasoning agents with GLM 4.5 Air (free), a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers available completely free of charge, open weights architecture. Access GLM 4.5 Air (free) via the OpenRouter API with up to 96K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
Tool Use
No
WeightsOpen
Temperature
Adjustable
Attachment
Not Supported
Limits
Context Window
128K

Tokens

Input Limit
128K

Tokens

Max Output
96K

Tokens

Pricing

Standard (per 1M tokens)

Input
Free
Output
Free
Frequently Asked Questions

GLM 4.5 Air (free) by OpenRouter costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
z-ai/glm-4.5-air:free
Provider
OpenRouter
Family
glm-air
Release Date
Jul 28, 2025
Knowledge Cutoff
Apr 1, 2025
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1
Documentation