---
id: pr-vllm-18275
repo: vllm-project/vllm
pr: 18275
title: '[Attention][V1] Toggle for v1 attention backend'
author: gshtras
date: '2025-05-29'
url: https://github.com/vllm-project/vllm/pull/18275
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: da4b69d0b435e74c0a208cffbf2f430f5529ec64
inclusion_reason: defer
changed_paths:
- vllm/attention/ops/chunked_prefill_paged_decode.py
- vllm/attention/ops/prefix_prefill.py
- vllm/envs.py
- vllm/v1/attention/backends/triton_attn.py
artifact_dir: evidence/pull-bundles/vllm/gh-18275
head_ref_oid: 3b264d5a3fdc63baedfb749879a333c780c0e6da
---
# [Attention][V1] Toggle for v1 attention backend

- Repository: `vllm-project/vllm`
- PR: [18275](https://github.com/vllm-project/vllm/pull/18275)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `vllm/attention/ops/chunked_prefill_paged_decode.py`
- `vllm/attention/ops/prefix_prefill.py`
- `vllm/envs.py`
- `vllm/v1/attention/backends/triton_attn.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-18275`
