---
id: pr-vllm-21408
repo: vllm-project/vllm
pr: 21408
title: Update flashinfer CUTLASS NVFP4 MoE Kernel to use per expert global scaling factor
author: wenscarl
date: '2025-07-24'
url: https://github.com/vllm-project/vllm/pull/21408
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- kernel-fusion
- moe
- nvfp4
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp4
- nvfp4
kernel_types:
- moe
- quantization
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 1b25f1fe757b0f0f877004f299f30dc079f81881
inclusion_reason: kernel file changes
changed_paths:
- vllm/model_executor/layers/fused_moe/flashinfer_cutlass_prepare_finalize.py
- vllm/model_executor/layers/quantization/modelopt.py
- vllm/utils/flashinfer.py
head_ref_oid: c7344a7fa95e5366cb79972a7bb2dc3893ac776a
artifact_dir: evidence/pull-bundles/vllm/gh-21408
---
# Update flashinfer CUTLASS NVFP4 MoE Kernel to use per expert global scaling factor

- Repository: `vllm-project/vllm`
- PR: [21408](https://github.com/vllm-project/vllm/pull/21408)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `vllm/model_executor/layers/fused_moe/flashinfer_cutlass_prepare_finalize.py`
- `vllm/model_executor/layers/quantization/modelopt.py`
- `vllm/utils/flashinfer.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21408`
