Every model, one endpoint
Enso is our frontier family, and it answers here only. Zen is Zoo Labs Foundation’s open-weight family — call it here, or download the weights and run it yourself. Every other lab answers on the same address, under the same key.
Zen
The open-weight family from Zoo Labs Foundation. We serve it first-party — and the weights are published, so you can run it yourself and never call us at all.
Browse by lab
Every model on the endpoint, grouped by who trained it. Prices and context windows come from the live catalog, so what you read here is what you will be billed.
Try it
Pick any model and start a thread, signed in with your Hanzo account.
Sign in to chat with Enso, Zen, or any model on the endpoint. Pick a model, start a thread, billed to your account and kept private.
One key, one host
Changing model is changing one string. The endpoint takes and returns the chat-completions JSON shape, so an HTTP client already written against that shape works once its base URL points at api.hanzo.ai/v1.
curl https://api.hanzo.ai/v1/chat/completions \
-H "Authorization: Bearer $HANZO_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "zen5",
"messages": [{ "role": "user", "content": "Hello" }]
}'