---
id: pr-vllm-12093
repo: vllm-project/vllm
pr: 12093
title: '[Kernel] Flash Attention 3 Support'
author: LucasWilkinson
date: '2025-01-23'
url: https://github.com/vllm-project/vllm/pull/12093
source_category: upstream-code
architectures:
- sm100
tags:
- attention
techniques: []
hardware_features: []
kernel_types:
- attention
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 978b45f39970f81d2857fbb8aada5b44619d258c
inclusion_reason: kernel file changes
changed_paths:
- CMakeLists.txt
- setup.py
- tests/kernels/test_cascade_flash_attn.py
- tests/kernels/test_flash_attn.py
- vllm/attention/backends/flash_attn.py
- vllm/envs.py
- vllm/v1/attention/backends/flash_attn.py
- vllm/v1/worker/gpu_model_runner.py
head_ref_oid: eafde62d6d74165ed08308494cc637e46ad43c77
artifact_dir: evidence/pull-bundles/vllm/gh-12093
---
# [Kernel] Flash Attention 3 Support

- Repository: `vllm-project/vllm`
- PR: [12093](https://github.com/vllm-project/vllm/pull/12093)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `CMakeLists.txt`
- `setup.py`
- `tests/kernels/test_cascade_flash_attn.py`
- `tests/kernels/test_flash_attn.py`
- `vllm/attention/backends/flash_attn.py`
- `vllm/envs.py`
- `vllm/v1/attention/backends/flash_attn.py`
- `vllm/v1/worker/gpu_model_runner.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-12093`
