---
id: pr-vllm-32339
repo: vllm-project/vllm
pr: 32339
title: '[Attention][MLA] Make `FLASHINFER_MLA` the default MLA backend on Blackwell, and TRTLLM the default prefill'
author: MatthewBonanni
date: '2026-01-15'
url: https://github.com/vllm-project/vllm/pull/32339
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 8ebfacaa7524dd9641cef9c5e4151214e0912dfd
inclusion_reason: defer
changed_paths:
- vllm/config/attention.py
- vllm/model_executor/layers/attention/mla_attention.py
- vllm/platforms/cuda.py
artifact_dir: evidence/pull-bundles/vllm/gh-32339
head_ref_oid: 66a883d5957c0f17796929c1cf9d6c0f9116ad7d
---
# [Attention][MLA] Make `FLASHINFER_MLA` the default MLA backend on Blackwell, and TRTLLM the default prefill

- Repository: `vllm-project/vllm`
- PR: [32339](https://github.com/vllm-project/vllm/pull/32339)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/config/attention.py`
- `vllm/model_executor/layers/attention/mla_attention.py`
- `vllm/platforms/cuda.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-32339`
