---
language:
- en
library_name: mlx
license: other
license_name: qwen-community-1.0
license_link: LICENSE
pipeline_tag: image-text-to-text
base_model: Qwen/Qwen3.8-Flash-Next
tags:
- mlx
- jang
- jang-4m
- quantized
- apple-silicon
- vision
- video
- reasoning
- agent
- tool-use
- qwen4_exp
- moe
- ngram-embedding
- imatrix
- awq
---

<p align="center">
  <img src="./jangq-logo.png" alt="JANGQ" width="220">
  &nbsp;&nbsp;&nbsp;
  <img src="./vmlx-logo.png" alt="vMLX" width="90">
</p>

# JANGQ-AI/Qwen3.8-Flash-Next-JANG_4M

**The recommended quality/size balance — median KL 0.0042 vs bf16 at 96.0 GiB (~73 GiB resident with the SSD-served table).**

A JANG bundle of [Qwen/Qwen3.8-Flash-Next](https://huggingface.co/Qwen/Qwen3.8-Flash-Next)
— the Qwen4-architecture preview: a 125B mixture-of-experts (512 experts,
6B active) with a 51B hashed n-gram embedding, Gated DeltaNet + Qwen Sparse
Attention hybrid layers, gated-residual streams, and vision+video towers —
quantized for Apple Silicon / MLX. Text, image and video weights are all
present in this exact bundle. Native multi-token-prediction head preserved (4-bit).

> **Best experienced in vMLX.** This bundle's layout — the SSD-served n-gram
> table, per-module mixed precision, and the native MTP head — is designed for
> the vMLX serving path. Access is gated (manual approval) while runtime
> support rolls out.

## Quality (measured, 5,931 held-out positions vs bf16)

![JANG ladder](./jang_ladder_wide.png)

| Tier | Size | RAM w/ SSD-table | median KL | top-1 | top-5 | top-10 |
|---|---|---|---|---|---|---|
| JANG_1L | 59.8 GiB | ~41 GiB | 0.0362 | 86.7% | 97.5% | 98.8% |
| JANG_2L | 65.3 GiB | ~48 GiB | 0.0260 | 88.2% | 98.2% | 99.0% |
| JANG_4S | 71.8 GiB | ~53 GiB | 0.0161 | 89.4% | 98.7% | 99.4% |
| **JANG_4M** | **96.0 GiB** | **~73 GiB** | **0.0042** | **94.4%** | **99.7%** | **99.9%** |
| JANG_6S | 106.3 GiB | ~83 GiB | 0.0035 | 94.7% | 99.7% | 99.9% |

Margin-conditioned flip curves are monotone-decreasing on every tier —
quantization noise lives in the reference model's own uncertainty band, with
zero disagreement at high-confidence positions on the upper tiers.

## The n-gram table & memory — SSD caching, fixed and fast

The 51B n-gram embedding streams **directly from SSD** on supporting runtimes
(16 row-reads per token) — the "RAM w/ SSD-table" column above is the true
resident footprint in that mode. Early runtime builds throttled in this mode;
**SSD-table caching is now fixed**: decode runs at full speed with the table
on disk — 40+ tok/s on an M5 Max for the 4-bit tier — so the biggest tiers fit
comfortably on 64–128 GB machines without giving up the table.


## What's in the bundle

- **Vision + video:** the full vision tower and both image and video
  preprocessors ship in this exact bundle — image-text-to-text and video
  understanding work out of the box on supporting runtimes (image and video
  token ids, mRoPE positions, and the merger are all present).
- **Multi-token prediction:** the model's native MTP head is preserved (trained multi-step). Enables self-speculative decode on supporting runtimes.
- **Thinking + agentic:** thinking mode on by default with three reasoning
  efforts and preserved thinking history; Hermes-style tool calling; the
  instruct preset gives direct non-thinking responses.
- **Long context:** 262,144 tokens native, extensible to 1M with YaRN.

## Serving contract

- Thinking mode ON by default: `temperature=1.0, top_p=0.95, top_k=20`
- Instruct mode: `temperature=0.7, top_p=0.80, top_k=20, presence_penalty=1.5`
- Reasoning efforts `low / medium / xhigh` (default **xhigh**) and
  `preserve_thinking` (default **on**) via chat-template kwargs
- Context 262,144 native, extensible to 1M with YaRN
- EOS `[248046, 248044]` · tool calls: Hermes-style `<tool_call>`

Quantized and validated by **Jinho Jang** — eric@jangq.ai