---
id: pr-sglang-14878
repo: sgl-project/sglang
pr: 14878
title: '[diffusion] feat: support sageattn & sageattn3 backend'
author: mickqian
date: '2025-12-11'
url: https://github.com/sgl-project/sglang/pull/14878
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 5d804a376736077ac0e2361f919589174fecaf57
inclusion_reason: defer
changed_paths:
- python/sglang/multimodal_gen/configs/models/dits/base.py
- python/sglang/multimodal_gen/runtime/entrypoints/diffusion_generator.py
- python/sglang/multimodal_gen/runtime/layers/attention/backends/sage_attn.py
- python/sglang/multimodal_gen/runtime/layers/attention/backends/sage_attn3.py
- python/sglang/multimodal_gen/runtime/loader/component_loader.py
- python/sglang/multimodal_gen/runtime/models/dits/qwen_image.py
- python/sglang/multimodal_gen/runtime/pipelines_core/stages/denoising.py
- python/sglang/multimodal_gen/runtime/platforms/cuda.py
- python/sglang/multimodal_gen/runtime/platforms/interface.py
artifact_dir: evidence/pull-bundles/sglang/gh-14878
head_ref_oid: 2a17e51a71a31397435cfab58ea2c09cfe09ed03
---
# [diffusion] feat: support sageattn & sageattn3 backend

- Repository: `sgl-project/sglang`
- PR: [14878](https://github.com/sgl-project/sglang/pull/14878)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `python/sglang/multimodal_gen/configs/models/dits/base.py`
- `python/sglang/multimodal_gen/runtime/entrypoints/diffusion_generator.py`
- `python/sglang/multimodal_gen/runtime/layers/attention/backends/sage_attn.py`
- `python/sglang/multimodal_gen/runtime/layers/attention/backends/sage_attn3.py`
- `python/sglang/multimodal_gen/runtime/loader/component_loader.py`
- `python/sglang/multimodal_gen/runtime/models/dits/qwen_image.py`
- `python/sglang/multimodal_gen/runtime/pipelines_core/stages/denoising.py`
- `python/sglang/multimodal_gen/runtime/platforms/cuda.py`
- `python/sglang/multimodal_gen/runtime/platforms/interface.py`

## Evidence Bundle

`evidence/pull-bundles/sglang/gh-14878`
