---
id: pr-vllm-21416
repo: vllm-project/vllm
pr: 21416
title: Updates to Flex + VLLm integration
author: drisspg
date: '2025-08-25'
url: https://github.com/vllm-project/vllm/pull/21416
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: e0329ed4b426af432a8cc0997f964ba1e59cfdc2
inclusion_reason: kernel file changes
changed_paths:
- tests/kernels/test_flex_attention.py
- tests/v1/attention/test_attention_backends.py
- vllm/v1/attention/backends/flex_attention.py
head_ref_oid: d67e7083168483e6ecf759e6e6532e1033402e8d
artifact_dir: evidence/pull-bundles/vllm/gh-21416
---
# Updates to Flex + VLLm integration

- Repository: `vllm-project/vllm`
- PR: [21416](https://github.com/vllm-project/vllm/pull/21416)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/kernels/test_flex_attention.py`
- `tests/v1/attention/test_attention_backends.py`
- `vllm/v1/attention/backends/flex_attention.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-21416`
