Models
zen4-ultra
Maximum reasoning model with 744B MoE (40B active) + extended chain-of-thought. 202K context.
zen4-ultra
Maximum Reasoning
The highest-capability Zen reasoning model. 744B MoE architecture with 40B active parameters and extended chain-of-thought for complex problems requiring deep multi-step reasoning.
Specifications
| Property | Value |
|---|---|
| Model ID | zen4-ultra |
| Parameters | 744B (40B active) |
| Architecture | MoE + CoT |
| Context Window | 202K tokens |
| Tier | ultra max |
| Input Price | $3.00 / 1M tokens |
| Output Price | $9.60 / 1M tokens |
Capabilities
- Extended chain-of-thought reasoning
- Complex mathematical and scientific problem solving
- Multi-step logical deduction
- Research-grade analysis and synthesis
- 202K context window for large documents
API Usage
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": "Prove that the square root of 2 is irrational."}]
}'from hanzoai import Hanzo
client = Hanzo(api_key="hk-your-api-key")
response = client.chat.completions.create(
model="zen4-ultra",
messages=[{"role": "user", "content": "Prove that the square root of 2 is irrational."}],
)
print(response.choices[0].message.content)See Also
- zen4 -- Standard flagship without thinking mode
- zen4-thinking -- Lightweight reasoning alternative
- Pricing -- Full pricing table