---
license: apache-2.0
base_model: tencent/Hy3
library_name: mlx
pipeline_tag: text-generation
language: en
tags:
  - mlx
  - apple-silicon
  - hy3
  - mixture-of-experts
  - mtp
  - speculative-decoding
  - mtplx
---

# Hy3-Demolition-MLX lite-v1-mtp

[Explore the model guide](https://huggingface.co/spaces/philipjohnbasile/local-ai-guide) · [All public work](https://huggingface.co/philipjohnbasile)

## Release at a glance

| | This artifact |
|---|---|
| Purpose | The Lite trunk with Hy3's NextN sidecar restored for MTP experiments. |
| Runtime | Requires a compatible Hy3 model implementation and MTPLX runtime contract. The upstream backend shipped, but that does not qualify this artifact. |
| Status | Runtime verification pending; see the evidence and limits below. |
| Tensor download | 112.57 GB (104.84 GiB) of root `.safetensors` files, including any root sidecars. This is a file-size total, not peak RAM. |
| Read first | Use the AR sibling for the documented generation path. No current end-to-end MTP speedup is established here. |

The **MTP-equipped** variant of [lite-v1](https://huggingface.co/philipjohnbasile/hy3-demolition-mlx-lite-v1): its fused trunk with the Hy3 **NextN (Multi-Token-Prediction) sidecar** grafted back on (`num_nextn_predict_layers=1`, num_experts=192), for self-speculative decoding on MTPLX.

## Runtime status — reviewed September 10, 2026

The original `recognized-backend-pending` observation came from MTPLX
2.0.1. It is historical: the maintainer subsequently confirmed that the
Hy3 and Qwen MTP backend work shipped in 2.1.0 through the release branch.
[Read the upstream shipping record](https://github.com/youssofal/MTPLX/pull/142).

That code shipment does not qualify this exact checkpoint. The source
Hy3 implementation, runtime contract, loading, output agreement, and
performance still need to be checked together. No fresh end-to-end MTP
qualification of this artifact is claimed here. Upstream mlx-lm PR
[#1211](https://github.com/ml-explore/mlx-lm/pull/1211) remained open at review.

The documented AR path is the [sibling model](https://huggingface.co/philipjohnbasile/hy3-demolition-mlx-lite-v1).

## How it was built

The MTP head consumes the trunk's final hidden state (hidden_size 4096, unchanged by pruning) and runs its own MoE on the global `num_experts`. So the base checkpoint's `mtp.*` sidecar grafts directly onto the fused AR trunk — no re-heal, no re-prune of the trunk.

Graft script + `mtplx inspect` receipts: https://github.com/PhilipJohnBasile/hy3-demolition-mlx (`scripts/38_mtp_sidecar_graft.py`, `eval/receipts/mtplx_inspect_*.json`).

## Limitations

- **Does not run on stock mlx_lm as MTP.** The fast MTP path needs the MTPLX backend; mlx-lm's own per-token self-speculative loop is ~4.7× *slower* than AR (measured), which is why the MTPLX batched-verify backend is the target.
- Everything from the base lite-v1 card applies (quantized MoE, English/agent focus, no tool execution).
- End-to-end MTP behavior is **unverified** until the backend loads it; recognition is structural (`mtplx inspect`), not a live run.

Base recipe + receipts: https://github.com/PhilipJohnBasile/hy3-demolition-mlx

## Other serving applications

No current LM Studio or Ollama qualification of this artifact is recorded
here. An architecture becoming available in one library does not establish
support in every application. Use the AR sibling's pinned release recipe
as the documented starting point.

## Experimental streaming

The source project's SSD pager measurements concern an AR serving path.
They do not qualify this MTP variant on a smaller-memory machine.
[Read the AR streaming experiment](https://github.com/PhilipJohnBasile/hy3-demolition-mlx/blob/main/docs/64gb-feasibility.md).