GLM 4.5 Air (free)
Z.ai GLM 4.5 Air (free) — pricing, 131k context window, API cost calculator and alternatives.
By Z.ai
Specs
- Provider
- Z.ai
- Slug
- z-ai/glm-4-5-air-free
- Capabilities
- tools
Pricing freshness
- Tier
- standard
- Currency
- USD
- As of
- 2026-05-08 17:08 UTC
Pricing history
Tracking GLM 4.5 Air (free) pricing since 2026-05-08. We'll plot the chart here once it changes.
Quickstart — call GLM 4.5 Air (free) from your app
curl https://openrouter.ai/api/v1/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-d '{
"model": "z-ai/glm-4-5-air-free",
"messages": [{"role": "user", "content": "Hello!"}]
}'Official docs: https://openrouter.ai/docs
# pip install openai
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key=os.environ["OPENROUTER_API_KEY"],
)
resp = client.chat.completions.create(
model="z-ai/glm-4-5-air-free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(resp.choices[0].message.content)Official docs: https://openrouter.ai/docs
// npm install openai
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://openrouter.ai/api/v1",
apiKey: process.env.OPENROUTER_API_KEY,
});
const resp = await client.chat.completions.create({
model: "z-ai/glm-4-5-air-free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(resp.choices[0].message.content);Official docs: https://openrouter.ai/docs
Related models
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Frequently asked questions
What is GLM 4.5 Air (free)?
GLM 4.5 Air (free) is a large language model API from Z.ai with a 131k-token context window. It costs $0 per 1M input tokens and $0 per 1M output tokens.
How much does GLM 4.5 Air (free) cost?
GLM 4.5 Air (free) is priced at $0 per 1M input tokens and $0 per 1M output tokens via the Z.ai API. A 50/50 input/output workload of 1M total tokens costs about $0.
What is the context window of GLM 4.5 Air (free)?
GLM 4.5 Air (free) supports up to 131k tokens of context per request — roughly 262 pages of English text or 16384 lines of code at a typical density.
Does GLM 4.5 Air (free) support vision, tool use, or JSON mode?
GLM 4.5 Air (free) supports tool/function calling. It does not support image input (vision) and structured JSON mode.
Who makes GLM 4.5 Air (free)?
GLM 4.5 Air (free) is built and operated by Z.ai. Pricing, context window, and capabilities on this page are refreshed nightly from Z.ai's public catalog.
Can I self-host GLM 4.5 Air (free)?
GLM 4.5 Air (free) is API-only — its weights are not publicly distributed by Z.ai, so it cannot be self-hosted today.