AX-Qwen3.8-2.4T-A95B-MLX-AXQ-2bit

Experimental AXQ 2-bit MLX pack of Qwen/Qwen3.8-2.4T-A95B-FP8.

Not certified. Will not be certified in this revision. Layer-stack SSD expert paging is too slow for practical serving, so this pack is a hobby / curiosity artifact: a 2.4T-class Qwen MoE that can exist on a Mac only because experts are paged from disk. If that sounds fun, enjoy. If you need something you can actually work with, use a smaller certified AXQ pack (Qwen 3.6, Flash, Coder-Next, GPT-OSS). No AXQ 4-bit sibling will be published for this base.

This card is convert evidence, not a quality or speed claim. Quality vs BF16 / FP8 was not measured.

This is an AXQuant pack (qwen38-moe-v1), not mlx-optiq. Do not load the OptiQ Qwen 3.8 repos in AX Engine.

Full convert notes: docs/qwen38-axq-2bit.md.

Why it is slow

The full table is ~1.13 TiB. No shipping Mac can resident-load it (512 GB unified memory is still too small). AX Engine pages one fused expert layer at a time (ax_expert_stream.json, required=true). Every token waits on SSD I/O for routed experts. That is why this revision is not a product path.

Estimated streamed peak: ~56 GiB resident trunk + ~12 GiB one layer + KV (about 100 GiB with headroom). You still need AX_ENGINE_2BIT_EXPERIMENTAL=1.

Do not mlx_lm.load this pack as a fully resident model.

Recipe

Affine, group size 32 (qwen38-experimental-2bit-v0.1.yaml):

Role Bits
Expert, attention, shared MLP 2
Embedding, router (mlp.gate) 8
Norms, LM head 16 (BF16)
MTP 16, byte-preserved into mtp.safetensors

Source: official FP8 revision d2dc35658bcf77e66643428cb52e774cc3b5bd29 (128×128 weight_scale_inv, unfused per-expert tensors). Convert uses the AXQuant stream backend because mlx_lm.load cannot ingest that snapshot.

Measured artifact

From axquant_manifest.json after weight verification (2026-08-13):

Quantity Value
Plan effective BPW 3.157
Measured total BPW 4.074
Measured main BPW 4.030
Logical parameters 2,446,182,725,504
Weight files 1,245,853,341,088 bytes (1.13 TiB)
MTP sidecar 26,989,794,744 bytes
Product class 2bit-experimental

Stream contract: 512 experts, 10 per token, 828 streamed tensors, layer-stack mode. Converted model_type is qwen3_5_moe (92 hybrid-attention layers, hidden 8192, MoE intermediate 2048, one MTP layer).

Status

Item Status
Convert + ax_expert_stream.json Done on df-macstudio-m2
Hub weights Uploaded
Quality vs BF16 / FP8 Not measured
AX Engine cert Will not certify this revision (too slow to be practical)
MTP acceleration Not claimed

Hobby use only. Not a supported product pack.

Downloads last month
-
Safetensors
Model size
305B params
Tensor type
F32
·
U32
·
MLX
Hardware compatibility
Log In to add your hardware

2-bit

Inference Providers NEW
This model isn't deployed by any Inference Provider. 🙋 Ask for provider support

Model tree for AutomatosX/AX-Qwen3.8-2.4T-A95B-MLX-AXQ-2bit

Quantized
(2)
this model