Question 1

What is GLM 4.5 Air?

Accepted Answer

GLM 4.5 Air is a model from Z.ai, released on Jul 28, 2025. GLM-4.5-Air is the lightweight variant of our latest flagship model family, also purpose-built for agent-centric applications. $0.13 per million input tokens, $0.85 per million output tokens. 131,072 token context window, maximum output of 98,304 tokens. Higher uptime with 3 providers. Includes independent benchmarks from Artificial Analysis.

Question 2

How much does GLM 4.5 Air cost?

Accepted Answer

On the Respan gateway, input starts at $0.12 per 1M tokens on Novita, and output starts at $0.77 per 1M tokens on Novita, after gateway discounts. Averaged across 5 providers, it costs $0.16 per 1M input tokens and $0.95 per 1M output tokens.

Question 3

Which providers serve GLM 4.5 Air on Respan?

Accepted Answer

5 providers serve GLM 4.5 Air: Novita, OpenRouter, IO.net, TogetherAI, and Z.ai. TogetherAI requires your own provider API key (BYOK).

Question 4

What is GLM 4.5 Air's context window?

Accepted Answer

GLM 4.5 Air accepts up to 131K tokens of context on its largest provider route.

Question 5

How do I use GLM 4.5 Air with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "zai/glm-4.5-air". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is GLM 4.5 Air?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was Novita at 44 tokens per second, and the lowest response latency was 1.3 seconds on Z.ai. Speed varies with request size and provider.

Question 7

How does GLM 4.5 Air score on benchmarks?

Accepted Answer

GLM 4.5 Air has 3 published benchmark scores, including GSO Opt@1 1%, AIME 2025 83.3%, and LMArena Elo 1373. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
NovitaSave 10%`novita/zai-org/glm-4.5-air`	131K	$0.12/M	$0.77/M
OpenRouter`openrouter/z-ai/glm-4.5-air`	131K	$0.13/M	$0.85/M
IO.net`ionet/zai-org/GLM-4.5-Air`	131K	$0.16/M	$0.94/M
TogetherAIBYOK only`together_ai/zai-org/GLM-4.5-Air-FP8`	131K	$0.20/M	$1.10/M
Z.ai`zai/glm-4.5-air`	128K	$0.20/M	$1.10/M

GLM 4.5 Air

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Coding1

Math1

Arena1

Apps

GLM 4.5 Air FAQ

Works with your entire stack

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