---
id: pr-vllm-26729
repo: vllm-project/vllm
pr: 26729
title: '[Bugfix] Fix gpt-oss w4a8 DP/EP on B200'
author: varun-sundar-rabindranath
date: '2025-10-21'
url: https://github.com/vllm-project/vllm/pull/26729
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
- fp8
- kernel-fusion
- moe
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp4
- fp8
kernel_types:
- moe
- quantization
languages:
- python
captured_at: '2026-04-27'
status: merged
merge_sha: 5ff5d94e77851f8ca11592bbb9aa414e65f4c353
inclusion_reason: kernel file changes
changed_paths:
- tests/quantization/test_blackwell_moe.py
- vllm/model_executor/layers/fused_moe/config.py
- vllm/model_executor/layers/quantization/mxfp4.py
- vllm/model_executor/layers/quantization/utils/mxfp8_utils.py
- vllm/model_executor/warmup/kernel_warmup.py
head_ref_oid: 8b99aa369c1c6099e2dedac184e104c61d5e1d92
artifact_dir: evidence/pull-bundles/vllm/gh-26729
---
# [Bugfix] Fix gpt-oss w4a8 DP/EP on B200

- Repository: `vllm-project/vllm`
- PR: [26729](https://github.com/vllm-project/vllm/pull/26729)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `tests/quantization/test_blackwell_moe.py`
- `vllm/model_executor/layers/fused_moe/config.py`
- `vllm/model_executor/layers/quantization/mxfp4.py`
- `vllm/model_executor/layers/quantization/utils/mxfp8_utils.py`
- `vllm/model_executor/warmup/kernel_warmup.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-26729`
