GLM 5.3 Flash
GLM 5.3 Flash is a language model from Z.ai (Zhipu AI). It is currently free at 4 providers with up to 1M tokens of context. The model supports step-by-step reasoning, is suited to coding, supports tool calling. Its weights are open, so it can also run locally.
- Developer
- Z.ai (Zhipu AI)
- Context
- 1M tokens
- Type
- Text
- License
- Open weights
- Free since
- September 19, 2026
Where to use GLM 5.3 Flash for free
Each row is a separate free endpoint with its own limits.
| Provider | Context | Limit | Card | |
|---|---|---|---|---|
OrcaRouter z-ai/glm-5.3-flash-free |
— | Free tier | — | Open |
NVIDIA Build z-ai/glm-5.3-flash |
— | Free serverless inference for development; limits and model availability may change. | No | Open |
UnoRouter glm-5.3-flash:free |
1M | No-card free models use shared capacity and per-model limits; availability can change. | No | Open |
OpenCode Zen glm-5.3-flash-free |
— | Free models are available for a limited time; prompts may be used to improve the model. | — | Open |
Quick start
curl https://api.orcarouter.ai/v1/chat/completions \
-H "Authorization: Bearer $ORCAROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "z-ai/glm-5.3-flash-free",
"messages": [{"role": "user", "content": "Hello!"}]
}'from openai import OpenAI
client = OpenAI(
base_url="https://api.orcarouter.ai/v1",
api_key="YOUR_ORCAROUTER_API_KEY",
)
reply = client.chat.completions.create(
model="z-ai/glm-5.3-flash-free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.orcarouter.ai/v1",
apiKey: process.env.ORCAROUTER_API_KEY,
});
const reply = await client.chat.completions.create({
model: "z-ai/glm-5.3-flash-free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(reply.choices[0].message.content);Example for OrcaRouter. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.
Benchmarks
Source: Artificial Analysis · GLM-5.3-Flash
Similar free models
FAQ
Is GLM 5.3 Flash free?
Yes. As of October 24, 2026, GLM 5.3 Flash is free at OrcaRouter, NVIDIA Build, UnoRouter, OpenCode Zen. Each provider has its own limits — see the table above.
What is the context window of GLM 5.3 Flash?
The largest context among free routes is 1,000,000 tokens. Some providers cap it lower.
How do I call GLM 5.3 Flash via API?
Use any OpenAI-compatible client with base URL https://api.orcarouter.ai/v1, model ID z-ai/glm-5.3-flash-free, and a OrcaRouter key.
How good is GLM 5.3 Flash?
Artificial Analysis Intelligence Index: 41.8, GPQA Diamond: 91%. For comparison, the strongest free model in the catalog right now is DeepSeek V4.1 Flash.
Is GLM 5.3 Flash open-weight?
Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.