Instructions to use eewer/Qwen3.5-4B-Thinking-Preservation with libraries, inference providers, notebooks, and local apps. Follow these links to get started.

Libraries

How to use eewer/Qwen3.5-4B-Thinking-Preservation with Transformers:

# Use a pipeline as a high-level helper
from transformers import pipeline

pipe = pipeline("image-text-to-text", model="eewer/Qwen3.5-4B-Thinking-Preservation")
messages = [
    {
        "role": "user",
        "content": [
            {"type": "image", "url": "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/p-blog/candy.JPG"},
            {"type": "text", "text": "What animal is on the candy?"}
        ]
    },
]
pipe(text=messages)

# Load model directly
from transformers import AutoProcessor, AutoModelForMultimodalLM

processor = AutoProcessor.from_pretrained("eewer/Qwen3.5-4B-Thinking-Preservation")
model = AutoModelForMultimodalLM.from_pretrained("eewer/Qwen3.5-4B-Thinking-Preservation")
messages = [
    {
        "role": "user",
        "content": [
            {"type": "image", "url": "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/p-blog/candy.JPG"},
            {"type": "text", "text": "What animal is on the candy?"}
        ]
    },
]
inputs = processor.apply_chat_template(
	messages,
	add_generation_prompt=True,
	tokenize=True,
	return_dict=True,
	return_tensors="pt",
).to(model.device)

outputs = model.generate(**inputs, max_new_tokens=40)
print(processor.decode(outputs[0][inputs["input_ids"].shape[-1]:]))

Notebooks
Google Colab
Kaggle
Local Apps Settings

vLLM

How to use eewer/Qwen3.5-4B-Thinking-Preservation with vLLM:

Install from pip and serve model

# Install vLLM from pip:
pip install vllm
# Start the vLLM server:
vllm serve "eewer/Qwen3.5-4B-Thinking-Preservation"
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:8000/v1/chat/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "eewer/Qwen3.5-4B-Thinking-Preservation",
		"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

docker model run hf.co/eewer/Qwen3.5-4B-Thinking-Preservation

SGLang

How to use eewer/Qwen3.5-4B-Thinking-Preservation with 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 "eewer/Qwen3.5-4B-Thinking-Preservation" \
    --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": "eewer/Qwen3.5-4B-Thinking-Preservation",
		"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 "eewer/Qwen3.5-4B-Thinking-Preservation" \
        --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": "eewer/Qwen3.5-4B-Thinking-Preservation",
		"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"
						}
					}
				]
			}
		]
	}'

Docker Model Runner
How to use eewer/Qwen3.5-4B-Thinking-Preservation with Docker Model Runner:
```
docker model run hf.co/eewer/Qwen3.5-4B-Thinking-Preservation
```

Qwen3.5-4B-Thinking-Preservation

Derived from Qwen/Qwen3.5-4B with a single change to the chat template:

Thinking is always preserved across multi-turn history (append-only). Every assistant turn keeps its <think>...</think> reasoning, not just the latest one.
No enable/disable toggle. The generation prompt always opens <think>; passing enable_thinking=False has no effect.

This makes multi-turn agent training match evaluation (the model always sees its own prior reasoning). Model weights are identical to Qwen3.5-4B; only the chat template differs. Vision weights are unchanged (not trained in the terminal-agent recipes).

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Safetensors

Model size

5B params

Tensor type

BF16

F32

Model tree for eewer/Qwen3.5-4B-Thinking-Preservation

Base model

Qwen/Qwen3.5-4B-Base

Finetuned

Qwen/Qwen3.5-4B

Finetuned

(326)

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