---
id: pr-vllm-23198
repo: vllm-project/vllm
pr: 23198
title: '[kernel] Support W4A8 on Hopper'
author: czhu-cohere
date: '2025-08-24'
url: https://github.com/vllm-project/vllm/pull/23198
source_category: upstream-code
architectures:
- sm100
- sm90
tags:
- fp8
- quantization
techniques: []
hardware_features:
- fp8
kernel_types:
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: e76e23354033f167b778f5e49fd384e301681d65
inclusion_reason: kernel file changes
changed_paths:
- CMakeLists.txt
- benchmarks/kernels/benchmark_machete.py
- benchmarks/kernels/weight_shapes.py
- csrc/quantization/cutlass_w4a8/w4a8_mm_entry.cu
- csrc/torch_bindings.cpp
- tests/kernels/quantization/test_cutlass_w4a8.py
- vllm/_custom_ops.py
- vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py
- vllm/model_executor/layers/quantization/compressed_tensors/schemes/__init__.py
- vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w4a8_fp8.py
- vllm/model_executor/layers/quantization/kernels/mixed_precision/__init__.py
- vllm/model_executor/layers/quantization/kernels/mixed_precision/cutlass.py
head_ref_oid: 97081c5ca2cf65be35e2d3ed389472f915fd033f
artifact_dir: evidence/pull-bundles/vllm/gh-23198
---
# [kernel] Support W4A8 on Hopper

- Repository: `vllm-project/vllm`
- PR: [23198](https://github.com/vllm-project/vllm/pull/23198)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `CMakeLists.txt`
- `benchmarks/kernels/benchmark_machete.py`
- `benchmarks/kernels/weight_shapes.py`
- `csrc/quantization/cutlass_w4a8/w4a8_mm_entry.cu`
- `csrc/torch_bindings.cpp`
- `tests/kernels/quantization/test_cutlass_w4a8.py`
- `vllm/_custom_ops.py`
- `vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py`
- `vllm/model_executor/layers/quantization/compressed_tensors/schemes/__init__.py`
- `vllm/model_executor/layers/quantization/compressed_tensors/schemes/compressed_tensors_w4a8_fp8.py`
- `vllm/model_executor/layers/quantization/kernels/mixed_precision/__init__.py`
- `vllm/model_executor/layers/quantization/kernels/mixed_precision/cutlass.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-23198`
