---
license: apache-2.0
language:
- en
- zh
tags:
- zen
- zenlm
- hanzo-ai
- zen-2
pipeline_tag: text-generation
library_name: transformers
---

# Zen 2 72B — Instruct

> **Originally released**: 2024-06-08
> **Parameters**: 72B | **Architecture**: Zen 2 Architecture | **Context**: 128K | **License**: Apache 2.0

Second generation of the Zen LM family (Q2 2024). Key breakthrough: **128K context window** via improved positional encoding and sliding window attention.

Instruction-tuned via RLHF and supervised fine-tuning.

## Research Lineage

| Generation | Release | Architecture | Key Advancement |
|------------|---------|--------------|-----------------|
| Zen 1 | Q4 2023 | Zen 1 Architecture | Foundation, dense transformer, 4K context |
| Zen 2 | Q2 2024 | Zen 2 Architecture | 128K context window |
| Zen 3 | Q3–Q4 2024 | Zen 3 Architecture | Sparse MoE routing, multimodal |
| Zen 4 | Q1 2025 | Zen 4 Architecture | 256K–1M context, extended families |
| Zen 5 | 2025+ | Zen MoDE | Next-generation frontier |


---
## The Zen LM Family

Joint research collaboration:
- **Hanzo AI** (Techstars '17) — AI infrastructure, API gateway, inference optimization
- **Zoo Labs Foundation** (501c3) — Open AI research, ZIPs governance, decentralized training
- **Lux Partners Limited** — Compute coordination and settlement layer

All weights Apache 2.0. Download, run locally, fine-tune, deploy commercially.

[HuggingFace](https://huggingface.co/zenlm) · [Chat free](https://hanzo.chat) · [API](https://api.hanzo.ai) · [Docs](https://zenlm.org)