---
id: pr-sglang-9559
repo: sgl-project/sglang
pr: 9559
title: Update CUTLASS 4.2 & Enable K-Major Scale Factor for SM90 FP8 Blockwise Group GEMM
author: HydraQYH
date: '2025-08-25'
url: https://github.com/sgl-project/sglang/pull/9559
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- fp8
- gemm
- moe
techniques: []
hardware_features:
- fp8
kernel_types:
- gemm
- moe
languages:
- cuda-cpp
- python
captured_at: '2026-04-27'
status: merged
merge_sha: fda47926208e8d22b56894da21031228fae4b81d
inclusion_reason: kernel file changes
changed_paths:
- python/sglang/srt/layers/moe/cutlass_moe.py
- python/sglang/test/test_cutlass_moe.py
- sgl-kernel/CMakeLists.txt
- sgl-kernel/csrc/moe/fp8_blockwise_moe_kernel.cu
- sgl-kernel/tests/test_fp8_blockwise_moe.py
head_ref_oid: 16c858f64c1e0e637b62da1d410895d19bbd1a08
artifact_dir: evidence/pull-bundles/sglang/gh-9559
---
# Update CUTLASS 4.2 & Enable K-Major Scale Factor for SM90 FP8 Blockwise Group GEMM

- Repository: `sgl-project/sglang`
- PR: [9559](https://github.com/sgl-project/sglang/pull/9559)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `python/sglang/srt/layers/moe/cutlass_moe.py`
- `python/sglang/test/test_cutlass_moe.py`
- `sgl-kernel/CMakeLists.txt`
- `sgl-kernel/csrc/moe/fp8_blockwise_moe_kernel.cu`
- `sgl-kernel/tests/test_fp8_blockwise_moe.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-9559`
