---
id: pr-sglang-19003
repo: sgl-project/sglang
pr: 19003
title: '[VLM] Introduce FlashInfer CUDNN Prefill as ViT Backend'
author: yuan-luo
date: '2026-02-24'
url: https://github.com/sgl-project/sglang/pull/19003
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 31c7dc9d990d47919435e5c1799d0d36e8b59eca
inclusion_reason: defer
changed_paths:
- python/sglang/srt/layers/attention/vision.py
- python/sglang/srt/models/qwen3_vl.py
- python/sglang/srt/server_args.py
- test/manual/nightly/test_vlms_vit_flashinfer_cudnn.py
artifact_dir: evidence/pull-bundles/sglang/gh-19003
head_ref_oid: 45da12bd832b890394486b60fe7f33fe4f3522e2
---
# [VLM] Introduce FlashInfer CUDNN Prefill as ViT Backend

- Repository: `sgl-project/sglang`
- PR: [19003](https://github.com/sgl-project/sglang/pull/19003)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `python/sglang/srt/layers/attention/vision.py`
- `python/sglang/srt/models/qwen3_vl.py`
- `python/sglang/srt/server_args.py`
- `test/manual/nightly/test_vlms_vit_flashinfer_cudnn.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-19003`
