---
library_name: transformers
pipeline_tag: text-generation
tags:
  - text-generation
  - reasoning
  - zen
  - zen4
  - hanzo
  - zenlm
license: apache-2.0
---

# Zen4 Ultra

**Zen LM by Hanzo AI** — Extended reasoning model with chain-of-thought. Optimized for complex multi-step problems.

## Specs

| Property | Value |
|----------|-------|
| Parameters | 744B MoE |
| Context | 262K |
| Architecture | Zen MoDE (Mixture of Distilled Experts) |
| Generation | Zen4 |

## API Access

```bash
curl https://api.hanzo.ai/v1/chat/completions \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "zen4-ultra", "messages": [{"role": "user", "content": "Hello"}]}'
```

Get your API key at [console.hanzo.ai](https://console.hanzo.ai) — $5 free credit on signup.

## License

Apache 2.0

---

*Zen LM is developed by [Hanzo AI](https://hanzo.ai) — Frontier AI infrastructure.*