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

# Zen4 Thinking

**Zen LM by Hanzo AI** — Chain-of-thought reasoning model with explicit thinking traces. Excels at math, logic, and step-by-step analysis.

## Specs

| Property | Value |
|----------|-------|
| Parameters | 562B MoE |
| Context Length | 262K tokens |
| Architecture | Zen MoDE (Mixture of Distilled Experts) |
| Generation | Zen4 |

## API Access

This model is served exclusively via the Hanzo AI API. Weight downloads are not available for this model tier.

```python
from openai import OpenAI

client = OpenAI(base_url="https://api.hanzo.ai/v1", api_key="YOUR_KEY")
response = client.chat.completions.create(
    model="zen4-thinking",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)
```

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.*