AX-Qwen3.8-Flash-Next-MLX-AXQ-MXFP4-MTP — 5.73 BPW measured main

An AXQuant (AXQ) mixed-precision MLX checkpoint for Apple Silicon, converted directly from the BF16 source model. The language path is quantized while the multi-token-prediction (MTP) head and vision tower are preserved at BF16 in the checkpoint (or a bound sidecar when present).

Development evidence — not a certified AXQuant release. This package has conversion and artifact-integrity records, but it does not publish measured quality, long-context, kernel-speed, or MTP-speed evidence. Do not interpret the AXQ product label as a benchmark claim.

Model details

Property	Value
Base model	Qwen/Qwen3.8-Flash-Next
Source revision	de4b8e4d43b917e7706784d8bb445c9af86a3540
Product family	qwen4-exp
Source architecture	Qwen4ExpForConditionalGeneration (mixture of experts (MoE)); text path optimized
Main-model parameters	177.39B logical parameters
Quantizer	AXQuant 1.9.0
Hub budget class	MXFP4
AXQuant base precision class	6p8bpw
Planned storage-adjusted BPW	6.3924
Measured main-model BPW	5.7281
Measured total BPW, including MTP	5.8769
Safetensors weight size	132.23 GB
Approximate complete download	132.26 GB
Configured maximum context	262,144 tokens; practical limits depend on unified memory
Primary MLX runtime	MLX-LM
AX Engine native execution	Not established; no validated native manifest is included
MTP present	True
Vision present	True
Audio present	False

This repository contains MLX Safetensors. It does not contain PyTorch or GGUF weights.

Choosing an AXQ pack

AXQ names describe a storage-budget product class, not one uniform precision applied to every tensor. Protected tensors remain at higher precision, so the exact measured BPW is authoritative. In particular, a 6bit-named mixed plan may retain 4bit as its base precision while selecting 6-bit, 8-bit, or BF16 for other tensors to meet an approximately 6-BPW total budget. Protection floors can also raise a 4bit-named pack close to (or above) a 6bit budget on small or heavily protected models. When that collapse happens, AutomatosX does not publish a separate misleading 4bit sibling for that base.

Sibling	Intended trade-off
4bit sibling	Lower-storage AXQ budget; check its exact BPW
6bit sibling	Higher average precision near the 6-BPW budget

See the AutomatosX collections for the family catalog, or the complete index.

Download

python -m pip install -U huggingface_hub
hf download AutomatosX/AX-Qwen3.8-Flash-Next-MLX-AXQ-MXFP4-MTP --local-dir ./AX-Qwen3.8-Flash-Next-MLX-AXQ-MXFP4-MTP

Allow at least 132.26 GB of free disk space. Pin the resulting Hub commit in reproducible deployments rather than relying indefinitely on main.

Run with MLX-LM

python -m pip install -U mlx-lm
mlx_lm.generate \
  --model AutomatosX/AX-Qwen3.8-Flash-Next-MLX-AXQ-MXFP4-MTP \
  --prompt "Explain mixed-precision quantization in three sentences." \
  --max-tokens 128 \
  --temp 0.0

MLX-LM compatibility covers standard text/backbone inference. It may ignore AXQuant runtime metadata and optional sidecars (vision.safetensors, mtp.safetensors); this command therefore does not establish MTP acceleration or vision-language quality. The artifact records MLX 0.32.1 and MLX-LM 0.31.3 from conversion.

AX Engine status

This package does not include a validated native model-manifest.json, so AX Engine execution is not established by this release. The AX Engine fields in axquant_runtime.json describe the intended compatibility contract, not observed runtime evidence. Use the architecture-specific MLX runtime path above. The artifact records AX Engine version 7.5.7, but version discovery alone is not a runtime check.

Use the packaged Qwen MTP head with oMLX or MTPLX

Use the explicit runtime branch rather than importing this original layout:

Runtime	Verified variant	Download revision
oMLX 0.7.0.dev4	oMLX branch	omlx
MTPLX 2.11.3	MTPLX branch	mtplx

hf download AutomatosX/AX-Qwen3.8-Flash-Next-MLX-AXQ-MXFP4-MTP --revision omlx --local-dir ./flash-next-omlx
hf download AutomatosX/AX-Qwen3.8-Flash-Next-MLX-AXQ-MXFP4-MTP --revision mtplx --local-dir ./flash-next-mtplx

Download each branch into a fresh directory and follow its model card and manifest launch requirements. The oMLX branch indexes native Qwen4 MTP and requires per-model qwen4_ple_ssd_offload=true on the tested host. The MTPLX branch supplies a canonical n-gram table plus adapted norms/native MTP experts; image input requires MTP mode. Original MXFP4 precision is retained.

Both variants passed short text generation with MTP off/on, plus image generation in supported modes, on 2026-10-06. Branch smoke summaries bind the exact tested artifacts. These are development compatibility checks, not quality, MTP exactness, throughput, or AXQuant certification. The historical qwen3-next-mtp label in this original main branch does not establish native Flash-Next compatibility. Original checkpoint files and historical evidence remain on main; peer variants carry their own manifests.

Quantization layout

Main-weight precision	Parameters	Share
4bit	123.73B	68.74%
8bit	52.57B	29.20%
bf16	3.70B	2.05%

• Quantization methods: affine, bf16.
• Group sizes used by quantized assignments: 32, 64.
• MTP sidecar: 31 tensors, 2.61B parameters, 5.21 GB, BF16.
• Vision sidecar: not included.
• Vision weights: protected BF16 in main shards.
• Optimization scope: text-path.
• Support tier: convertible.

BF16 sidecars, when present, are included in total download size. Their presence does not by itself establish MTP acceleration or vision-language quality.

Evidence and validation status

Check	Status
Planning evidence	architecture_prior
Calibration	none; the allocation is based on architecture priors
Quantizer execution	708/708 recorded module conversions succeeded; 0 fallbacks
AX Engine native manifest	not included
Quality versus BF16 or uniform baselines	Not published; no quality-retention claim
MTP acceptance and speed	not measured; no MTP speedup claim
AX Engine kernel evidence	unmeasured
Vision-language quality	Not evaluated or claimed; vision tensors are preserved at BF16
Speech-recognition quality	Not applicable
Long-context quality	262,144-token capacity is config metadata, not a validated claim
Release certification	Not certified; formal AXQuant M0-M8 gates are not closed

Intended use and limitations

• Intended for local development and evaluation on Apple Silicon with MLX-compatible runtimes.

• No minimum unified-memory figure is claimed; loadability depends on model size, context length, KV-cache policy, runtime buffers, and other processes using unified memory.

• Architecture-prior allocation is not measured sensitivity. It must not be presented as measured model quality.

• MTP requires a sidecar-aware runtime. oMLX/MTPLX discovery compatibility does not establish exactness or speed certification for those runtimes.

• Vision weights are preserved at BF16, but this release does not claim validated VLM quality.

• The configured context window can require substantially more memory as the KV cache grows.

• AX Engine execution is not established because this package has no validated native manifest.

• Upstream capabilities, limitations, biases, and responsible-use guidance still apply.

Provenance and audit files

• axquant_manifest.json: package identity, byte accounting, runtime contract, software versions, and file checksums.
• axquant_plan.json: per-tensor precision decisions and planning evidence.
• axquant_quantizer_execution.json: conversion coverage and fallback records.
• axquant_runtime.json: declared AX Engine and MLX compatibility metadata; runtime checks remain separate evidence.
• axquant_mtp_sidecar_manifest.json: MTP tensor provenance.

All published provenance uses repository-relative paths. Local source paths are stripped before publication. The checkpoint was converted from BF16 rather than re-quantized from an OptiQ artifact. If an OptiQ repository is published separately, it uses a different quantizer and should not be assumed to have identical BPW or quality.

License

The checkpoint follows the upstream model license where applicable (often Apache License 2.0). See LICENSE and the Qwen/Qwen3.8-Flash-Next model card for license terms, model limitations, and responsible-use guidance.

Catalog runtime audit (2026-10-06)

See runtime_audit.json for pinned source config/index/header bindings and immutable measured runtime-variant references. Main retains the original checkpoint layout; download the named peer branch for its runtime.