---
id: pr-vllm-27255
repo: vllm-project/vllm
pr: 27255
title: 'Bugfix: Cutlass FP8 FusedMoE bad scaling factors'
author: amirkl94
date: '2025-11-05'
url: https://github.com/vllm-project/vllm/pull/27255
source_category: upstream-code
architectures:
- sm100
tags:
- fp8
- kernel-fusion
- moe
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp8
kernel_types:
- moe
- quantization
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 6b7a81185d7e0f0fbad23d59db857eeafee688f7
inclusion_reason: kernel file changes
changed_paths:
- tests/kernels/moe/test_flashinfer.py
- vllm/model_executor/layers/fused_moe/config.py
- vllm/model_executor/layers/fused_moe/flashinfer_cutlass_prepare_finalize.py
- vllm/model_executor/layers/quantization/modelopt.py
head_ref_oid: d7932ce60bcba6728261e387d914fe61cff3662a
artifact_dir: evidence/pull-bundles/vllm/gh-27255
---
# Bugfix: Cutlass FP8 FusedMoE bad scaling factors

- Repository: `vllm-project/vllm`
- PR: [27255](https://github.com/vllm-project/vllm/pull/27255)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/kernels/moe/test_flashinfer.py`
- `vllm/model_executor/layers/fused_moe/config.py`
- `vllm/model_executor/layers/fused_moe/flashinfer_cutlass_prepare_finalize.py`
- `vllm/model_executor/layers/quantization/modelopt.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-27255`
