---
license: other
license_name: tencent-hy-community
license_link: LICENSE
library_name: mlx
tags:
  - mlx
  - jang
  - jangtq
  - hy3
  - hunyuan
  - hy_v3
  - moe
  - apple-silicon
  - 2bit
  - 295b
  - osaurus
pipeline_tag: text-generation
base_model: tencent/Hy3-preview
base_model_relation: quantized
---

<p align="center"><img src="osaurus-x-banner.png" width="100%" alt="OsaurusAI"/></p>

# Hy3-preview-JANGTQ

**Tencent Hy3-preview — 79 GB on disk** (down from the ~557 GB BF16 source) —
2-bit **JANGTQ** quantization on routed experts + 8-bit affine elsewhere.

- **Source:** [tencent/Hy3-preview](https://huggingface.co/tencent/Hy3-preview)
  (Hy3 architecture, 295B total / 21B active, BF16 native, 256K context,
  80 transformer layers + 1 MTP, 192 routed experts top-8 + 1 shared)
- **Quantization:** **JANGTQ** — 2-bit MXTQ codebook (Hadamard-rotated,
  Lloyd-Max optimized) on routed-expert weights + 8-bit affine on
  attention / shared expert / dense layer-0 / embed / lm_head / MTP
  matmuls + fp16 passthrough on RMSNorms / router gate / `expert_bias`
- **MTP:** layer 80 weights preserved (`mtp_mode=preserved_disabled`);
  decode is one-token-per-forward until accept/reject speculative loop
  ships
- **Bundle size:** **79 GB on-disk** across 85 shards
- **Runs on:** M4 Max 128 GB / M5 Max 128 GB / Mac Studio 192 GB+

## What's in the bundle

| Module | Source dtype | Bundle dtype |
|---|---|---|
| Routed experts (192 × 3 mats × 79 sparse layers, per-expert layout) | BF16 | **2-bit MXTQ** + sidecar codebook |
| Attention q/k/v/o + q/k norms | BF16 | 8-bit affine g=64 |
| Shared expert (gate/up/down) | BF16 | 8-bit affine g=64 |
| Dense layer-0 MLP | BF16 | 8-bit affine g=64 |
| `embed_tokens` / `lm_head` | BF16 | 8-bit affine g=64 |
| MTP layer matmuls | BF16 | 8-bit affine g=64 (preserved_disabled) |
| RMSNorms / `router.gate.weight` / `expert_bias` | BF16 / F32 | fp16 passthrough |

`jangtq_runtime.safetensors` sidecar (~22 KB) for Swift runtimes — covers
`(in_features={1536, 4096}, seed=42, bits=2)` codebooks + sign-flip vectors.

## Loading (Python)

```bash
pip install jang-tools mlx-lm
```

```python
from jang_tools.load_jangtq import load_jangtq_model

model, tokenizer = load_jangtq_model("OsaurusAI/Hy3-preview-JANGTQ")

chat = tokenizer.apply_chat_template(
    [{"role": "user", "content": "What is 2 + 2? Answer briefly."}],
    tokenize=False,
    add_generation_prompt=True,
    reasoning_effort="no_think",
)
```

`load_jangtq_model` auto-registers `model_type=hy_v3` via
`jang_tools.hy3` before building the MLX skeleton. The loader applies
the standard SwitchGLU fused gate+up + P15 router compile + P18 QKV
fusion patches automatically. Two Hy3-specific runtime fixes are baked
in:

1. **fp32 lm_head**. `enable_lm_head_fp32=True` in the bundle config —
   `Model.__call__` dequantizes the quantized lm_head and accumulates
   the 4096-dim contraction in fp32 (mirrors DSV4's pattern). bf16
   accumulation drifts logits by ~0.5/elem and flips top-k token picks
   toward high-baseline-energy junk tokens.
2. **qk_norm under JANGTQ P18 QKV fusion**. JANGTQ's QKV-fusion patch
   replaces the attention `__call__`; `Hy3Attention` declares
   `use_qk_norm=True` and uses `Hy3HeadRMSNorm` to auto-reshape flat
   `[B, L, n_heads * head_dim]` input to per-head shape so RMSNorm
   normalizes over `head_dim`, not over the entire flat dimension.

Decode ~15 tok/s greedy on M5 Max 128 GB at `reasoning_effort=no_think`.

## Reasoning + tools

- **Reasoning parser:** `qwen3` (extracts `<think>...</think>` blocks)
- **Tool parser:** `hunyuan` (Tencent XML-like:
  `<tool_calls><tool_call>name<tool_sep><arg_key>k</arg_key><arg_value>v</arg_value></tool_call></tool_calls>`)
- **Reasoning effort:** `no_think` (default) | `low` | `high` — pass via
  `apply_chat_template(..., reasoning_effort="…")`
- **Default rendering:** template emits a closed `<think></think>` for
  `no_think` mode; the runtime should NOT auto-open a reasoning prefix
  unless `low` or `high` is explicitly requested
- **Cache:** `kv` (standard GQA cache; no MLA, no SSM, no sliding-window)

## Top-K runtime override

`JANGTQ_TOPK_OVERRIDE=4 python serve.py` lowers per-token expert count
from the trained 8 to 4 for ~10% decode speedup. Coherence holds on
short prompts in our smoke tests; long-form quality is not benchmarked.
The patcher refuses to set K above the trained value and logs the
attribute count it modified.

## Credits

- **Quantization + MLX runtime:** Jinho Jang ([eric@osaurus.ai](mailto:eric@osaurus.ai))
- **Source model:** Tencent Hy3-preview team
- **License:** [Tencent Hy Community License](LICENSE) — non-commercial, EU/UK/SK
  excluded; consult the LICENSE for full terms

## Validated runtime contract

- 80 layers materialize; 79 routed-expert SwitchGLU instances hydrate via
  TurboQuantLinear (2-bit MXTQ).
- Capabilities verify: `family=hy_v3`, `reasoning_parser=qwen3`,
  `tool_parser=hunyuan`, `think_in_template=False`, `supports_thinking=True`,
  `cache_type=kv`, `modality=text`.
- Coherence smoke (M5 Max 128 GB):
  - "What is 2 + 2?" → `4<｜hy_eos｜>` (15.2 tok/s)
  - "The capital of France is" → top-1 ` Paris` (logit 19.13)
  - "def fibonacci(n):" → top-1 `\n`, top-3 includes ` return`
- Hard-prompt benchmark coverage (HumanEval, MMLU, long-context) is
  pending. This bundle is shipped on smoke evidence; treat results
  beyond short prompts as preview-quality until benchmarks land.

## Runtime support matrix

| Surface | Status |
|---|---|
| `jang-tools` Python (`load_jangtq_model`) | ✅ working — this README's load snippet |
| `vmlx-swift-lm` Swift | ✅ working — `Libraries/MLXLLM/Models/Hy3.swift` + JANGTQ codebook dispatch. Same family path that ships ZAYA and Bailing/Ling. |
| `vmlx_engine` Python via re-export | pending — `vmlx_engine.loaders.load_jangtq_hy3` re-export of `jang_tools.hy3.runtime.load_hy3_model` not yet wired |
| MTP speculative decode | preserved-disabled — weights present in bundle, accept/reject loop not yet implemented in any JANG runtime |