GLM 5.3 Flash Thinking
GLM 5.3 Flash Thinking is a language model from Z.ai (Zhipu AI). It is currently free at 1 provider 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
Where to use GLM 5.3 Flash Thinking for free
Each row is a separate free endpoint with its own limits.
Quick start
curl https://api.unorouter.com/v1/chat/completions \
-H "Authorization: Bearer $UNOROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "glm-5.3-flash-thinking:free",
"messages": [{"role": "user", "content": "Hello!"}]
}'from openai import OpenAI
client = OpenAI(
base_url="https://api.unorouter.com/v1",
api_key="YOUR_UNOROUTER_API_KEY",
)
reply = client.chat.completions.create(
model="glm-5.3-flash-thinking:free",
messages=[{"role": "user", "content": "Hello!"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.unorouter.com/v1",
apiKey: process.env.UNOROUTER_API_KEY,
});
const reply = await client.chat.completions.create({
model: "glm-5.3-flash-thinking:free",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(reply.choices[0].message.content);Example for UnoRouter. 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 Thinking free?
Yes. As of November 2, 2026, GLM 5.3 Flash Thinking is free at UnoRouter. Each provider has its own limits — see the table above.
What is the context window of GLM 5.3 Flash Thinking?
The largest context among free routes is 1,000,000 tokens. Some providers cap it lower.
How do I call GLM 5.3 Flash Thinking via API?
Use any OpenAI-compatible client with base URL https://api.unorouter.com/v1, model ID glm-5.3-flash-thinking:free, and a UnoRouter key.
How good is GLM 5.3 Flash Thinking?
Artificial Analysis Intelligence Index: 41.8, GPQA Diamond: 91%. For comparison, the strongest free model in the catalog right now is GLM 5.3 Flash.
Is GLM 5.3 Flash Thinking open-weight?
Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.