About the base model
Qwen3.5-9B is a multimodal vision-language model from the Qwen team
(Alibaba Group). It accepts interleaved image + text (and video) input and
generates text, with a "thinking" reasoning mode enabled by default.
Table | |
|---|
| Base model | Qwen/Qwen3.5-9B |
| Parameters | ~9B |
| Modality | Image-Text-to-Text (vision-language) |
| Architecture | Hybrid Gated DeltaNet + sparse MoE, with a vision encoder |
| Context length | 262,144 tokens native (extensible with RoPE scaling) |
| Languages | 201 languages and dialects |
| License | Apache 2.0 |
For full details on capabilities, benchmarks, and prompt formatting, see the
base model card.
Quantization details
Table | |
|---|
| Method | NVFP4 (4-bit floating point) |
| Format | compressed-tensors |
| Quantized modules | Linear layers of the language model |
| Kept in higher precision | Vision tower, router gates, and lm_head |
| Recommended hardware | NVIDIA Blackwell (FP4 tensor cores, sm_120) |
The vision tower is intentionally left unquantized to preserve image
understanding quality.
Usage
Serve with vLLM (OpenAI-compatible API)
docker run --rm --gpus all -p 8000:8000 \ -v "$PWD:/models" \ vllm/vllm-openai:latest \ --model /models/Qwen3.5-9B-NVFP4 \ --served-model-name Qwen3.5-9B-NVFP4 \ --quantization compressed-tensors \ --max-model-len 32768
Or directly from the Hub:
docker run --rm --gpus all -p 8000:8000 \ vllm/vllm-openai:latest \ --model sanskar003/Qwen3.5-9B-NVFP4 \ --quantization compressed-tensors
Query it (image + text)
curl -s http://localhost:8000/v1/chat/completions \ -H 'Content-Type: application/json' -d '{ "model": "Qwen3.5-9B-NVFP4", "messages": [{"role": "user", "content": [ {"type": "text", "text": "Describe this image."}, {"type": "image_url", "image_url": {"url": "http://images.cocodataset.org/train2017/000000231895.jpg"}} ]}] }'
Requirements
- An NVIDIA Blackwell GPU with FP4 tensor cores (sm_120) for the intended
performance. vLLM selects the FP4 kernel automatically for this
compressed-tensors checkpoint.
- A recent vLLM build that supports the
Qwen3_5ForConditionalGeneration
architecture.
License
Released under Apache 2.0, inherited from the base model
Qwen/Qwen3.5-9B. Please review and
comply with the base model's license terms.
Citation
Please cite the original Qwen work — see the
base model card for citation details.