---
id: pr-flashinfer-1644
repo: flashinfer-ai/flashinfer
pr: 1644
title: Added mx_fp4 support using the cudnn backend
author: nvmbreughe
date: '2025-09-09'
url: https://github.com/flashinfer-ai/flashinfer/pull/1644
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- gemm
techniques: []
hardware_features:
- fp4
kernel_types:
- gemm
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 7c587eb16c9236b7797525411fe8aedea0c9ec05
inclusion_reason: kernel file changes
changed_paths:
- flashinfer/gemm.py
- tests/test_mm_fp4.py
head_ref_oid: cae2656003ed9f44defa020781a00fc150a1445d
artifact_dir: evidence/pull-bundles/flashinfer/gh-1644
---
# Added mx_fp4 support using the cudnn backend

- Repository: `flashinfer-ai/flashinfer`
- PR: [1644](https://github.com/flashinfer-ai/flashinfer/pull/1644)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `flashinfer/gemm.py`
- `tests/test_mm_fp4.py`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-1644`
