---
id: pr-sglang-15182
repo: sgl-project/sglang
pr: 15182
title: '[NVIDIA] upstream FA4'
author: johnnynunez
date: '2026-01-11'
url: https://github.com/sgl-project/sglang/pull/15182
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- attention
- flash-attention
techniques: []
hardware_features: []
kernel_types:
- attention
- flash-attention
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: b5493f65be22447af02edbfb6eb4cee71f2bc779
inclusion_reason: kernel file changes
changed_paths:
- sgl-kernel/CMakeLists.txt
- sgl-kernel/python/sgl_kernel/_fa4_interface.py
- sgl-kernel/python/sgl_kernel/flash_attn.py
- sgl-kernel/tests/test_flash_attention_4.py
head_ref_oid: a02e62d80a03e3b4f446a83bf77e130c520f9171
artifact_dir: evidence/pull-bundles/sglang/gh-15182
---
# [NVIDIA] upstream FA4

- Repository: `sgl-project/sglang`
- PR: [15182](https://github.com/sgl-project/sglang/pull/15182)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `sgl-kernel/CMakeLists.txt`
- `sgl-kernel/python/sgl_kernel/_fa4_interface.py`
- `sgl-kernel/python/sgl_kernel/flash_attn.py`
- `sgl-kernel/tests/test_flash_attention_4.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-15182`
