---
id: pr-vllm-23991
repo: vllm-project/vllm
pr: 23991
title: '[Model] Add LongCat-Flash '
author: OftenDream
date: '2025-09-25'
url: https://github.com/vllm-project/vllm/pull/23991
source_category: upstream-code
architectures:
- sm100
tags:
- decode
- fp4
- fp8
- kernel-fusion
- mla
- moe
- quantization
techniques:
- kernel-fusion
hardware_features:
- fp4
- fp8
kernel_types:
- decode
- mla
- moe
- quantization
languages:
- cuda-cpp
captured_at: '2026-04-27'
status: merged
merge_sha: 845adb3ec6d7123a4f4251c121d406524aa76548
inclusion_reason: kernel file changes
changed_paths:
- csrc/moe/moe_align_sum_kernels.cu
- docs/models/supported_models.md
- tests/kernels/moe/test_flashinfer.py
- tests/models/registry.py
- tests/models/utils.py
- tests/test_routing_simulator.py
- vllm/config/model.py
- vllm/config/speculative.py
- vllm/model_executor/layers/fused_moe/fused_moe.py
- vllm/model_executor/layers/fused_moe/layer.py
- vllm/model_executor/layers/mla.py
- vllm/model_executor/layers/quantization/awq_marlin.py
- vllm/model_executor/layers/quantization/bitsandbytes.py
- vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors_moe.py
- vllm/model_executor/layers/quantization/experts_int8.py
- vllm/model_executor/layers/quantization/fp8.py
- vllm/model_executor/layers/quantization/gguf.py
- vllm/model_executor/layers/quantization/gptq_marlin.py
- vllm/model_executor/layers/quantization/modelopt.py
- vllm/model_executor/layers/quantization/moe_wna16.py
- vllm/model_executor/layers/quantization/mxfp4.py
- vllm/model_executor/layers/quantization/quark/quark_moe.py
- vllm/model_executor/layers/quantization/rtn.py
- vllm/model_executor/layers/quantization/utils/quant_utils.py
- vllm/model_executor/models/longcat_flash.py
- vllm/model_executor/models/longcat_flash_mtp.py
- vllm/model_executor/models/registry.py
- vllm/model_executor/models/utils.py
- vllm/v1/spec_decode/eagle.py
- vllm/v1/worker/gpu_model_runner.py
- vllm/v1/worker/utils.py
head_ref_oid: 870a2b8ceb9d61c261f15d2d059fb7dcdacff1ec
artifact_dir: evidence/pull-bundles/vllm/gh-23991
---
# [Model] Add LongCat-Flash 

- Repository: `vllm-project/vllm`
- PR: [23991](https://github.com/vllm-project/vllm/pull/23991)
- Decision: `kernel file changes`
- Reason: kernel file changes

## Changed Paths

- `csrc/moe/moe_align_sum_kernels.cu`
- `docs/models/supported_models.md`
- `tests/kernels/moe/test_flashinfer.py`
- `tests/models/registry.py`
- `tests/models/utils.py`
- `tests/test_routing_simulator.py`
- `vllm/config/model.py`
- `vllm/config/speculative.py`
- `vllm/model_executor/layers/fused_moe/fused_moe.py`
- `vllm/model_executor/layers/fused_moe/layer.py`
- `vllm/model_executor/layers/mla.py`
- `vllm/model_executor/layers/quantization/awq_marlin.py`
- `vllm/model_executor/layers/quantization/bitsandbytes.py`
- `vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors_moe.py`
- `vllm/model_executor/layers/quantization/experts_int8.py`
- `vllm/model_executor/layers/quantization/fp8.py`
- `vllm/model_executor/layers/quantization/gguf.py`
- `vllm/model_executor/layers/quantization/gptq_marlin.py`
- `vllm/model_executor/layers/quantization/modelopt.py`
- `vllm/model_executor/layers/quantization/moe_wna16.py`
- `vllm/model_executor/layers/quantization/mxfp4.py`
- `vllm/model_executor/layers/quantization/quark/quark_moe.py`
- `vllm/model_executor/layers/quantization/rtn.py`
- `vllm/model_executor/layers/quantization/utils/quant_utils.py`
- `vllm/model_executor/models/longcat_flash.py`
- `vllm/model_executor/models/longcat_flash_mtp.py`
- `vllm/model_executor/models/registry.py`
- `vllm/model_executor/models/utils.py`
- `vllm/v1/spec_decode/eagle.py`
- `vllm/v1/worker/gpu_model_runner.py`
- `vllm/v1/worker/utils.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-23991`
