About GLM 5.3
GLM-5.3 is a large reasoning language model from Z AI built for complex software engineering and long-horizon agent tasks. It keeps the 1M-token context window of GLM-5.2 and improves on it in coding and in the balance between quality and token efficiency.
The model supports function calling and sustained multi-step workflows, and suits agentic engineering, code assistance, and reasoning over very long contexts. Weights have not been published.
| Metric | Value |
|---|---|
| Context Length | 1,048,576 tokens |
| Multilingual | Yes |
Ready to build with GLM 5.3?
Try GLM 5.3 in the Workbench to prompt it, compare outputs, and iterate on prompts without writing any code. When you're ready to ship, call the same model from our API and build your own apps on top of it.
curl -sSf -X POST https://hub.oxen.ai/api/ai/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $OXEN_API_KEY" \
-d '{
"model": "zai-org-glm-5-3",
"messages": [
{
"role": "user",
"content": "Try sending a message."
}
]
}'API endpoint
See the API reference for request and response formats.
POST
https://hub.oxen.ai/api/ai/chat/completions