LLM Perks

GLM 5.3 Flash

Z.ai (Zhipu AI) · All GLM models
Free right now Mid-size
ReasoningCodingTool useLong contextOpen weights

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.

ProviderContextLimitCard
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!"}]
  }'

Example for OrcaRouter. Any OpenAI-compatible client works: Cursor, Cline, OpenCode, Open WebUI.

Benchmarks

Intelligence Index
41.8
GPQA Diamond
91.2%
Humanity's Last Exam
39.9%
Long context (LCR)
80.0%

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.