---
id: pr-sglang-19391
repo: sgl-project/sglang
pr: 19391
title: '[Qwen3.5] Enable MTP spec_v2 and add test for nvidia/Qwen3.5-397B-A17B-NVFP4'
author: hlu1
date: '2026-03-04'
url: https://github.com/sgl-project/sglang/pull/19391
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 9457c049e19e1cfa75833ef4351ac5aa26941c2c
inclusion_reason: defer
changed_paths:
- python/sglang/srt/disaggregation/decode.py
- python/sglang/srt/mem_cache/memory_pool.py
- python/sglang/srt/model_executor/forward_batch_info.py
- python/sglang/srt/models/qwen3_5_mtp.py
- python/sglang/srt/server_args.py
- python/sglang/srt/speculative/eagle_worker_v2.py
- test/registered/4-gpu-models/test_qwen35_models.py
- test/registered/4-gpu-models/test_qwen3_next_models_mtp.py
artifact_dir: evidence/pull-bundles/sglang/gh-19391
head_ref_oid: 1b8739c7edd161dbdbd52c131c1a1a392f4d0edc
---
# [Qwen3.5] Enable MTP spec_v2 and add test for nvidia/Qwen3.5-397B-A17B-NVFP4

- Repository: `sgl-project/sglang`
- PR: [19391](https://github.com/sgl-project/sglang/pull/19391)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `python/sglang/srt/disaggregation/decode.py`
- `python/sglang/srt/mem_cache/memory_pool.py`
- `python/sglang/srt/model_executor/forward_batch_info.py`
- `python/sglang/srt/models/qwen3_5_mtp.py`
- `python/sglang/srt/server_args.py`
- `python/sglang/srt/speculative/eagle_worker_v2.py`
- `test/registered/4-gpu-models/test_qwen35_models.py`
- `test/registered/4-gpu-models/test_qwen3_next_models_mtp.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-19391`
