LLM Perks

GLM 5.3

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

GLM 5.3 is a language model from Z.ai (Zhipu AI). It is currently free at 2 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

Where to use GLM 5.3 for free

Each row is a separate free endpoint with its own limits.

ProviderContextLimitCard
Together AI
zai-org/GLM-5.3-FP8
1M Fair use (depends on server load) — Open
Together AI
zai-org/GLM-5.3-FP8-Lora
1M Fair use (depends on server load) — Open
NVIDIA Build
z-ai/glm-5.3
— Free serverless inference for development; limits and model availability may change. No Open

Quick start

curl https://api.together.xyz/v1/chat/completions \
  -H "Authorization: Bearer $TOGETHER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai-org/GLM-5.3-FP8",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

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

Benchmarks

Intelligence Index
44.8
GPQA Diamond
91.7%
Humanity's Last Exam
42.3%
Long context (LCR)
79.7%

Source: Artificial Analysis · GLM-5.3 (Max)

Similar free models

FAQ

Is GLM 5.3 free?

Yes. As of October 24, 2026, GLM 5.3 is free at Together AI, NVIDIA Build. Each provider has its own limits — see the table above.

What is the context window of GLM 5.3?

The largest context among free routes is 1,048,576 tokens. Some providers cap it lower.

How do I call GLM 5.3 via API?

Use any OpenAI-compatible client with base URL https://api.together.xyz/v1, model ID zai-org/GLM-5.3-FP8, and a Together AI key.

How good is GLM 5.3?

Artificial Analysis Intelligence Index: 44.8, GPQA Diamond: 92%. For comparison, the strongest free model in the catalog right now is DeepSeek V4.1 Flash.

Is GLM 5.3 open-weight?

Yes, the weights are published — you can download and run it locally, for example with Ollama or LM Studio.