[Bug] Unrecognized configuration class <class 'sglang.srt.utils.hf_transformers.common._DeepseekV4ConfigAlias'>

[shahizat]

Checklist

• I searched related issues but found no solution.
• The bug persists in the latest version.
• Issues without environment info and a minimal reproducible demo are hard to resolve and may receive no feedback.
• If this is not a bug report but a general question, please start a discussion at https://github.com/sgl-project/sglang/discussions. Otherwise, it will be closed.
• Please use English. Otherwise, it will be closed.

Describe the bug

Hello, I want to run deepseek-ai/DeepSeek-V4-Flash-0731 on NVIDIA B200 and RTX PRO 6000 Blackwell GPUs, but I'm encountering the following issue.

Unrecognized configuration class <class 'sglang.srt.utils.hf_transformers.common._DeepseekV4ConfigAlias'> 

Reproduction

Command to reproduce:

uv venv .sglang --python 3.12
source .sglagn/bin/activate

uv pip install -U sglang --pre \
  --index-url https://sgl-project.github.io/whl/cu130/ \
  --extra-index-url https://pypi.org/simple \
  --extra-index-url https://download.pytorch.org/whl/cu130 \
  --index-strategy unsafe-best-match

sglang serve \
  --trust-remote-code \
  --model-path deepseek-ai/DeepSeek-V4-Flash-0731 \
  --tp 2 \
  --moe-runner-backend flashinfer_mxfp4 \
  --mem-fraction-static 0.98 \
  --cuda-graph-max-bs-decode 32 \
  --host 0.0.0.0 \
  --port 30000

Environment

Python: 3.12.13 (main, Jul 10 2026, 00:00:00) [GCC 11.5.0 20240719 (Red Hat 11.5.0-14)]
CUDA available: True
GPU 0,1,2,3,4,5,6,7: NVIDIA B200
GPU 0,1,2,3,4,5,6,7 Compute Capability: 10.0
CUDA_HOME: /usr/local/cuda
NVCC: Cuda compilation tools, release 13.3, V13.3.73
CUDA Driver Version: 595.71.05
PyTorch: 2.11.0+cu130
sglang: 0.5.16
sglang-kernel: 0.4.5+cu130
flashinfer_python: 0.6.14
flashinfer_cubin: Module Not Found
flashinfer_jit_cache: Module Not Found
triton: 3.6.0
transformers: 5.12.1
torchao: 0.17.0+cu130
numpy: 2.3.5
aiohttp: 3.14.3
fastapi: 0.141.1
huggingface_hub: 1.26.0
interegular: 0.3.3
modelscope: 1.39.0
orjson: 3.11.9
outlines: 0.1.11
packaging: 26.2
psutil: 7.2.2
pydantic: 2.14.0a1
python-multipart: 0.0.32
pyzmq: 27.1.0
uvicorn: 0.52.0
uvloop: 0.22.1
vllm: Module Not Found
xgrammar: 0.2.1
openai: 2.6.1
tiktoken: 0.13.0
anthropic: 0.120.2
litellm: Module Not Found
torchcodec: 0.11.1+cu130
NVIDIA Topology:
        GPU0    GPU1    GPU2    GPU3    GPU4    GPU5    GPU6    GPU7    NIC0    NIC1    NIC2    NIC3    NIC4    NIC5    NIC6    CPU Affinity    NUMA Affinity   GPU NUMA ID
GPU0     X      NV18    NV18    NV18    NV18    NV18    NV18    NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU1    NV18     X      NV18    NV18    NV18    NV18    NV18    NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU2    NV18    NV18     X      NV18    NV18    NV18    NV18    NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU3    NV18    NV18    NV18     X      NV18    NV18    NV18    NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU4    NV18    NV18    NV18    NV18     X      NV18    NV18    NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU5    NV18    NV18    NV18    NV18    NV18     X      NV18    NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU6    NV18    NV18    NV18    NV18    NV18    NV18     X      NV18    PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
GPU7    NV18    NV18    NV18    NV18    NV18    NV18    NV18     X      PHB     PHB     PHB     PHB     PHB     PHB     PHB     0-47    0-1             N/A
NIC0    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X      PHB     PHB     PHB     PHB     PHB     PHB
NIC1    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X      PHB     PHB     PHB     PHB     PHB
NIC2    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X      PHB     PHB     PHB     PHB
NIC3    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X      PHB     PHB     PHB
NIC4    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X      PHB     PHB
NIC5    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X      PHB
NIC6    PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB     PHB      X

Legend:

  X    = Self
  SYS  = Connection traversing PCIe as well as the SMP interconnect between NUMA nodes (e.g., QPI/UPI)
  NODE = Connection traversing PCIe as well as the interconnect between PCIe Host Bridges within a NUMA node
  PHB  = Connection traversing PCIe as well as a PCIe Host Bridge (typically the CPU)
  PXB  = Connection traversing multiple PCIe bridges (without traversing the PCIe Host Bridge)
  PIX  = Connection traversing at most a single PCIe bridge
  NV#  = Connection traversing a bonded set of # NVLinks

NIC Legend:

  NIC0: mlx5_0
  NIC1: mlx5_1
  NIC2: mlx5_2
  NIC3: mlx5_3
  NIC4: mlx5_4
  NIC5: mlx5_5
  NIC6: mlx5_6


Hypervisor vendor:: KVM
ulimit soft: 1024