How much does GLM 4.5 Air cost?

GLM 4.5 Air costs $0.13/M input tokens and $0.85/M output tokens, with separate rates for Cache Read at $0.025/M tokens.

What is the context length of GLM 4.5 Air?

GLM 4.5 Air has a 131,072 token context window. It supports up to 98,304 completion tokens.

Does GLM 4.5 Air support tool calling and structured outputs?

Yes. GLM 4.5 Air accepts tools and tool_choice for function calling. It does not support response_format, so JSON output is not enforced.

Which providers serve GLM 4.5 Air?

GLM 4.5 Air is served by 3 providers on OpenRouter: NovitaAI, SiliconFlow, and Z.ai. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was GLM 4.5 Air released?

GLM 4.5 Air was released on July 25, 2025. Its knowledge cutoff is December 31, 2024.

Z.ai: GLM 4.5 Air

z-ai/glm-4.5-air

Model weights

Compare

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 size. GLM-4.5-Air also supports hybrid inference modes, offering a "thinking mode" for advanced reasoning and tool use, and a "non-thinking mode" for real-time interaction. Users can control the reasoning behaviour with the reasoning enabled boolean. Learn more in our docs

Modalities

In / out price

$0.13 / $0.85per 1M

Context

131K

Released

Jul 25, 2025

Knowledge cutoff

Dec 2024

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick: Balanced (price + speed), Nitro (fastest), or Floor (cheapest).

Latency / throughput


$0.20	$1.10	$0.03	0.55s	65 tok/s	99.95%
$0.13	$0.85	$0.025	1.20s	51 tok/s	100.00%
$0.14	$0.86	--	1.27s	53 tok/s	100.00%

Input $0.20Output $1.10
65 tok/s99.95% uptime
Input $0.13Output $0.85
51 tok/s100.00% uptime
Input $0.14Output $0.86
53 tok/s100.00% uptime

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Weighted average

Input

$0.07715/M tokens

Output

$0.9717/M tokens

GLM 4.5 Air — Price history

Price history

No effective price data for this selection

$0.0625	$1.098	80.8%	59.1%
$0.0792	$0.848	48.3%	27.7%
$0.1399	$0.859	52.3%	13.3%

Effective in $0.0625Effective out $1.098
Token share
59.1%
Effective in $0.0792Effective out $0.848
Token share
27.7%
Effective in $0.1399Effective out $0.859
Token share
13.3%

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

99.22%

Availability over the last 3 days

Last 72 hours

Availability 99.22%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

98.65%

Without Routing

96.21%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and provider routing options.

Benchmarks

Scores on standardized evaluations and this model’s own outputs on shared benchmark prompts. Higher percentages are better — and each rank shows where this model lands among the models evaluated on that source.

Benchmark score summary for Z.ai: GLM 4.5 Air (Artificial Analysis and Design Arena)
Source	Benchmark	Score
Artificial Analysis	GLM-4.5-Air GPQA Diamond	73.3%
Artificial Analysis	GLM-4.5-Air HLE	7.0%
Artificial Analysis	GLM-4.5-Air IFBench	37.6%
Artificial Analysis	GLM-4.5-Air τ²-Bench Telecom	46.5%
Artificial Analysis	GLM-4.5-Air AA-LCR	46.7%
Artificial Analysis	GLM-4.5-Air CritPt	0.0%
Artificial Analysis	GLM-4.5-Air LiveCodeBench	68.4%
Artificial Analysis	GLM-4.5-Air Terminal-Bench Hard	20.5%
Artificial Analysis	GLM-4.5-Air MMLU-Pro	81.5%
Artificial Analysis	GLM-4.5-Air AIME 2025	80.7%
Artificial Analysis	GLM-4.5-Air AIME	67.3%
Artificial Analysis	GLM-4.5-Air MATH-500	96.5%
Design Arena	GLM 4.5 Air Models Arena 3D Elo	1102
Design Arena	GLM 4.5 Air Models Arena Code Categories Elo	1127
Design Arena	GLM 4.5 Air Models Arena Data Visualization Elo	1183
Design Arena	GLM 4.5 Air Models Arena Game Development Elo	1083
Design Arena	GLM 4.5 Air Models Arena SVG Elo	1060
Design Arena	GLM 4.5 Air Models Arena UI Component Elo	1113
Design Arena	GLM 4.5 Air Models Arena Website Elo	1138

Apps

Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

OpenClaw

OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.

893Mtokens

Claude Code

Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.

776Mtokens

Hermes Agent

Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.

401Mtokens

OpenHands

AI coding agent that can run commands, browse the web, call APIs

399Mtokens

Nous Research API

Nous Research is an AI research team focused on advancing open-source AI.

240Mtokens

Rest of OpenRouter

47.7M

Top 5 Apps

8.79M

Not currently available through EU in-region routing. In-region routing docs

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Z.ai: GLM 4.5 Air

Providers