Z.ai: GLM 4.5 Air pricing and alternatives

Paid / limited

Available from OpenRouter

★★★★★★★★★★ 3.5 Benchmark-backed score

GLM-4.5 Air is the lightweight Mixture-of-Experts variant of Zhipu AI's (Z.ai) flagship GLM model family, available free on OpenRouter.

Paid / limitedOpenAI compatibleReasoningTool callingTextReasoning

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API Details

Copy-ready connection details

Use these values in your client or SDK.

Base URL

https://openrouter.ai/api/v1

Model ID

z-ai/glm-4.5-air

API format OpenAI Chat Completions + OpenAI Responses

Technical Details

Z.ai: GLM 4.5 Air specifications

Provider catalog

Context window 131K

Max output 98K

Status Online

Family glm-air

Knowledge cutoff 2024-12-31

Released Jul 28, 2025

Last updated Oct 6, 2026

Free listing since Jul 25, 2025

Input text, reasoning

Output text

Capabilities reasoning, tool calling

Open weights Yes

AI Recommendation

Should you use Z.ai: GLM 4.5 Air?

Z.ai: GLM 4.5 Air is listed for chat workloads and supports a 131K context window.

Use the comparison and availability sections before choosing this listing, because it is not currently marked as free.

Best for

Chat

Strengths & Weaknesses

Strengths

Long context window
Reasoning mode listed
Tool calling support
Works with OpenAI-style SDKs

Watch outs

No current free listing on this provider
Free-tier rate limits apply
Vision support is not listed

Benchmark Overview

Benchmark signals for Z.ai: GLM 4.5 Air

Measured data

Intelligence General reasoning and instruction following

11.1/100

Speed Observed generation speed

69 tok/s

Context Maximum listed context window

131K

Pricing

Z.ai: GLM 4.5 Air pricing per 1M tokens

Provider pricing

Input $0.17 per 1M tokens

Output $0.98 per 1M tokens

Access Not listed OpenRouter

Rate limit 200 req/day (free tier) provider policy

Availability

Z.ai: GLM 4.5 Air availability by provider

Current provider only

We only found this glm-air listing on OpenRouter in the current catalog. Use the related models section for nearby alternatives.

Provider	Model listing	Access	Context	API	Limits
OpenRouter	Z.ai: GLM 4.5 Air	Paid	131K	OpenAI-style	200 req/day (free tier)

View OpenRouter setup guide →

Compare

Z.ai: GLM 4.5 Air alternatives to consider

Open comparison

Model	Provider	Context	Access
inclusionAI: Ling 3.1 Flash	OpenRouter	262K	Free tier
Apodex: Apodex 1.1 Mini (free)	OpenRouter	262K	Free tier
inclusionAI: Ling 3.0 Flash Sante (free)	OpenRouter	262K	Free tier
Dots Studio: Dots3-Note Preview (free)	OpenRouter	512K	Free tier
LiquidAI: LFM2.5-2.6B (free)	OpenRouter	66K	Free tier

Typical Use Cases

Z.ai: GLM 4.5 Air use cases

Chat

Z.ai: GLM 4.5 Air is tagged for chat in this catalog and works with OpenAI-compatible client libraries.

FAQ

Z.ai: GLM 4.5 Air free API FAQ

Is Z.ai: GLM 4.5 Air free to use?

Z.ai: GLM 4.5 Air is not currently marked as free on OpenRouter.

What is the Z.ai: GLM 4.5 Air model ID?

The model ID shown in this catalog is z-ai/glm-4.5-air.

What are the Z.ai: GLM 4.5 Air free tier rate limits on OpenRouter?

The listed free tier limit is 200 req/day (free tier). Limits can change per account tier, so confirm against the provider dashboard.

What context window does Z.ai: GLM 4.5 Air support?

The listed context window is 131K tokens with up to 98K output tokens.

More about Z.ai: GLM 4.5 Air

GLM-4.5 Air is the lightweight Mixture-of-Experts variant of Zhipu AI's (Z.ai) flagship GLM model family, available free on OpenRouter. Purpose-built for agent-centric applications with 131K context window. Supports hybrid inference modes — a thinking mode for reasoning and tool use, plus a non-thinking mode for real-time interaction, toggled via a reasoning.enabled parameter. Compact MoE architecture for efficient deployment. Text-only. Also available directly from Z AI's platform. OpenAI-compatible via OpenRouter. Free tier: 200 RPD.

For API keys, setup steps, and provider-level limits, see the OpenRouter provider page.