How to use from
SGLang
Install from pip and serve model
# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "amd/Qwen3.5-397B-A17B-NVFP4" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "amd/Qwen3.5-397B-A17B-NVFP4",
		"messages": [
			{
				"role": "user",
				"content": [
					{
						"type": "text",
						"text": "Describe this image in one sentence."
					},
					{
						"type": "image_url",
						"image_url": {
							"url": "https://cdn.britannica.com/61/93061-050-99147DCE/Statue-of-Liberty-Island-New-York-Bay.jpg"
						}
					}
				]
			}
		]
	}'
Use Docker images
docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "amd/Qwen3.5-397B-A17B-NVFP4" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "amd/Qwen3.5-397B-A17B-NVFP4",
		"messages": [
			{
				"role": "user",
				"content": [
					{
						"type": "text",
						"text": "Describe this image in one sentence."
					},
					{
						"type": "image_url",
						"image_url": {
							"url": "https://cdn.britannica.com/61/93061-050-99147DCE/Statue-of-Liberty-Island-New-York-Bay.jpg"
						}
					}
				]
			}
		]
	}'
Quick Links

Model Overview

  • Model Architecture: Qwen3_5MoeForConditionalGeneration
    • Input: Text, Image, Video
    • Output: Text
  • Supported Hardware Microarchitecture: AMD MI300/MI350/MI355 (emulation)
  • ROCm: 7.2.2
  • PyTorch: 2.10.0
  • Transformers: 5.14.0
  • Operating System(s): Linux
  • Inference Engine: vLLM
  • Model Optimizer: AMD-Quark (v0.12)
    • Quantized layers: Experts in language model only
    • Weight quantization: MOE-only, NVFP4, Static
    • Activation quantization: MOE-only, NVFP4, Dynamic

Model Quantization

The model was quantized from Qwen/Qwen3.5-397B-A17B-FP8 using AMD-Quark. The weights and activations are quantized to NVFP4.

Quantization scripts:

exclude_layers="lm_head model.visual.* mtp.* *mlp.gate *shared_expert* *shared_expert_gate* *linear_attn.* *self_attn.*"
export CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7
export MODEL_DIR=Qwen/Qwen3.5-397B-A17B
export output_dir=amd/Qwen3.5-397B-A17B-NVFP4
python3 quantize_quark.py \
--model_dir $MODEL_DIR \
--quant_scheme nvfp4\
--num_calib_data 128 \
--multi_gpu balanced \
--exclude_layers $exclude_layers \
--model_export hf_format  \
--output_dir $output_dir

Deployment

Use with vLLM

This model can be deployed efficiently using the vLLM backend.

Evaluation

The model was evaluated on GSM8K benchmarks.

Accuracy

Benchmark Qwen/Qwen3.5-397B-A17B-FP8 amd/Qwen3.5-397B-A17B-NVFP4(this model) Recovery
gsm8k (flexible-extract) 95.38 94.47 99.04%

Reproduction

The GSM8K result was obtained using the lm-evaluation-harness framework, based on the Docker image rocm/vllm-dev:nightly_main_20260603.

Install the lm-eval (Version: 0.4.12) in container first.

pip install lm-eval[api]

Evaluating model in a new terminal

export VLLM_ALLOW_LONG_MAX_MODEL_LEN=1
export CUDA_VISIBLE_DEVICES=0,1,2,3,4,5,6,7
lm_eval   --model vllm   
          --model_args pretrained=amd/Qwen3.5-397B-A17B-NVFP4,tensor_parallel_size=8,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.

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