Z.ai: GLM 4.5 Air pricing and alternatives

Paid / limited

Available from OpenRouter

★★★★★★★★★★ 3.5 Benchmark-backed score

Lighter GLM-4.5 variant for fast coding assistance and cheaper agents

Paid / limitedOpenAI compatibleReasoningTool callingTextReasoning

Check Provider Compare Save API Key

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 Aug 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

16.5/100

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

Free 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
Poolside: Laguna S 2.1 (free)	OpenRouter	262K	Free tier
Poolside: Laguna XS 2.1 (free)	OpenRouter	262K	Free tier
Cohere: North Mini Code (free)	OpenRouter	256K	Free tier
NVIDIA: Nemotron 3.5 Content Safety (free)	OpenRouter	128K	Free tier
NVIDIA: Nemotron 3 Ultra (free)	OpenRouter	1.0M	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