Models
zen5-ultra
Deepest reasoning model in the Zen family. Multi-pass chain-of-thought with self-verification.
zen5-ultra
Deepest Reasoning
The deepest reasoning model in the Zen family. Multi-pass chain-of-thought with self-verification enables unprecedented accuracy on hard problems -- mathematics, scientific reasoning, complex code analysis, and long-horizon planning.
Specifications
| Property | Value |
|---|---|
| Model ID | zen5-ultra |
| Parameters | TBA |
| Architecture | MoDE + Deep CoT |
| Context Window | 1M tokens |
| Tier | ultra max |
| Status | Contact Sales |
Capabilities
- Multi-pass chain-of-thought with self-verification
- 1M token context for the largest documents and codebases
- Frontier-class mathematical and scientific reasoning
- Complex code analysis and refactoring at scale
- Long-horizon autonomous planning
- Self-correcting reasoning with iterative refinement
Access
zen5-ultra is currently available via enterprise agreement.
Contact Sales to request access.
Resources
See Also
- zen5-pro -- High-throughput agentic production model
- zen5 -- Zen5 flagship
- zen4-ultra -- Available now: maximum reasoning