Z.ai
GLM-5.3 Flash
A smaller, lower-cost GLM model that reads text and images, for coding and agent work such as browser and computer use.
- Context window
- 1M tokens
- Accepts
- Text and images
- Input per 1M tokens
- $0.20
- Output per 1M tokens
- $0.50
Send your first request
Set LYCEUM_API_KEY to your API key, then run this request. Usage is billed to your account.
- Base URL
https://api.lyceum.technology/openai/v1- Model ID
z-ai/glm-5.3-flash- Request fields
model, messages, stream, max_tokens, tools, tool_choice
Documented request fields for this endpoint. See the documentation for model-specific controls and limits.
app.py · Install openai and set LYCEUM_API_KEY
import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["LYCEUM_API_KEY"],
base_url="https://api.lyceum.technology/openai/v1",
)
response = client.chat.completions.create(
model="z-ai/glm-5.3-flash",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)app.ts · Install openai and set LYCEUM_API_KEY in Node.js
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.LYCEUM_API_KEY,
baseURL: "https://api.lyceum.technology/openai/v1",
});
const response = await client.chat.completions.create({
model: "z-ai/glm-5.3-flash",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0]?.message.content);Terminal · Set LYCEUM_API_KEY in your terminal
curl https://api.lyceum.technology/openai/v1/chat/completions \
-H "Authorization: Bearer $LYCEUM_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "z-ai/glm-5.3-flash",
"messages": [
{"role": "user", "content": "Hello!"}
]
}'What it costs and how fast it runs
You pay only for the tokens you use. Speed figures come from our own status checks.
Token pricing
| USD per million tokens | |
|---|---|
| Input | $0.20 |
| Cached input | $0.05 |
| Output | $0.50 |
No base fee. Caching applies only where listed. Check the model's processing region before sending data.
Speed on Lyceum
| Last 7 days | |
|---|---|
| Time to first token | 302 ms |
| Output speed | 45 tokens/s |
Median over the last 7 days from our status checks: short requests. Measured 6 October 2026, 09:41 UTC. Reasoning tokens count towards both figures. Live status and availability
The model in detail
Checked against the sources below. Anything they don't state is left out.
Capabilities
- Input and output
- Text and images in, text out
- Context window
- 1M tokens
- Reasoning
- On by default
- Tool calling
- Supported
Architecture and licence
- Total parameters
- 320B
- Active parameters
- 18B
- Architecture
- Mixture of experts
- Licence
- MIT
- Released
- 26 August 2026
Availability
- API model ID
z-ai/glm-5.3-flash- Provider
- Z.ai
- Processing region
- EU-hosted
- Input and output types: official model card, checked 10 September 2026.
- Capabilities and request fields: Lyceum API documentation, checked 9 September 2026.
- Parameters, licence and release date: Z.ai’s own sources, including its model card and announcement, checked 29 September 2026.
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