---
id: pr-vllm-21626
repo: vllm-project/vllm
pr: 21626
title: '[Attention] Make CutlassMLA the default backend for SM100 (blackwell)'
author: alexm-redhat
date: '2025-07-27'
url: https://github.com/vllm-project/vllm/pull/21626
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 8f605ee30912541126c0fe46d0c8c413101b600a
inclusion_reason: defer
changed_paths:
- vllm/platforms/cuda.py
artifact_dir: evidence/pull-bundles/vllm/gh-21626
head_ref_oid: 9153e79d60bdc1e4726c6f2d7426a18c46ad8bc6
---
# [Attention] Make CutlassMLA the default backend for SM100 (blackwell)

- Repository: `vllm-project/vllm`
- PR: [21626](https://github.com/vllm-project/vllm/pull/21626)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/platforms/cuda.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21626`
