amd / Qwen3.5-35B-A3B-MXFP4

Model Overview

• Model Architecture: Qwen3_5MoeForConditionalGeneration
  • Input: Text
  • Output: Text
• Supported Hardware Microarchitecture: AMD MI300 MI350/MI355
• ROCm : 7.0
• PyTorch : 2.8.0
• Transformers : 5.2.0
• Operating System(s): Linux
• Inference Engine: SGLang / vLLM
• Model Optimizer: AMD-Quark (v0.11.1)
  • Weight quantization: OCP MXFP4, Static
  • Activation quantization: OCP MXFP4, Dynamic

Model Quantization

The model was quantized from Qwen/Qwen3.5-35B-A3B-FP8 using AMD-Quark . The weights are quantized to MXFP4 and activations are quantized to MXFP4.

Quantization scripts:

cd Quark/examples/torch/language_modeling/llm_ptq/
export exclude_layers="lm_head  model.visual.*  mtp.*  *mlp.gate *shared_expert_gate* *.linear_attn.*  *.self_attn.*  *.shared_expert.*"
python3 quantize_quark.py --model_dir Qwen/Qwen3.5-35B-A3B-FP8 \
                          --quant_scheme  mxfp4 \
                          --file2file_quantization \
                          --exclude_layers $exclude_layers \
                          --output_dir amd/Qwen3.5-35B-A3B-MXFP4

For further details or issues, please refer to the AMD-Quark documentation or contact the respective developers.

Evaluation

The model was evaluated on gsm8k benchmarks using the vllm framework.

Accuracy

Reproduction

The GSM8K results were obtained using the vLLM framework, based on the Docker image rocm/vllm-dev:nightly , and vLLM is installed inside the container with fixes applied for model support.

Evaluating model in a new terminal

lm_eval \
  --model vllm \
  --model_args pretrained=$MODEL,tensor_parallel_size=1,max_model_len=262144,gpu_memory_utilization=0.90,max_gen_toks=2048,trust_remote_code=True,reasoning_parser=qwen3 \
  --tasks gsm8k  --num_fewshot 5 \
  --batch_size auto

License

Modifications Copyright(c) 2026 Advanced Micro Devices, Inc. All rights reserved.