---
id: pr-flash-attention-1791
repo: Dao-AILab/flash-attention
pr: 1791
title: ABI stable fa3
author: mikaylagawarecki
date: '2025-09-12'
url: https://github.com/Dao-AILab/flash-attention/pull/1791
source_category: upstream-code
architectures:
- sm90
tags:
- cuda kernel
- hopper
techniques: []
hardware_features:
- hopper
kernel_types:
- attention
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: b3846b059bf6b143d1cd56879933be30a9f78c81
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- hopper/flash_api_stable.cpp
- hopper/setup.py
artifact_dir: evidence/pull-bundles/flash-attention/gh-1791
head_ref_oid: 712b6bc8aa283cf753c937c1b67eef5171490e0b
---
# ABI stable fa3

- Repository: `Dao-AILab/flash-attention`
- PR: [1791](https://github.com/Dao-AILab/flash-attention/pull/1791)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `hopper/flash_api_stable.cpp`
- `hopper/setup.py`

## Evidence Bundle

`evidence/pull-bundles/flash-attention/gh-1791`
