GGUF quantization of Qwen3.5-4B, prepared for NobodyWho: it works with NobodyWho out of the box, with Qwen's recommended sampling metadata embedded in every quant, and is verified with NobodyWho's test suite. Qwen3.5 is Alibaba's latest small-model family — natively multimodal (text + image), with strong reasoning and best-in-class tool calling for its size.

Model Capabilities

Text generation — instruction-following chat
Tool calling — native function calling with grammar-constrained output (14/14 on NobodyWho's suite)
Vision — image understanding via the companion mmproj-BF16.gguf projection model
Reasoning — thinking mode (on by default)
Long context — up to 256k tokens
Multilingual — broad language coverage

Available Quantizations

File	Approach	Tool-calling tests
`Qwen_Qwen3.5-4B-BF16-vendor-sampling.gguf`	Vendor sampling injected	14/14
`Qwen_Qwen3.5-4B-Q8_0-vendor-sampling.gguf`	Vendor sampling injected	14/14
`Qwen_Qwen3.5-4B-Q4_K_M-vendor-sampling.gguf`	Vendor sampling injected	14/14
`mmproj-BF16.gguf`	Vision projection (use with any of the above)	—

Verified with NobodyWho's tool-calling suite across BF16 / Q8_0 / Q4_K_M (14/14 each, June 2026); vision, reasoning, and multilingual verified. The upstream GGUF has no general.sampling.* metadata, so the -vendor-sampling files embed Qwen's recommended sampler (see INJECTION.md).

Quick Start

Using the NobodyWho library:

python

from nobodywho import Chat

chat = Chat("huggingface:NobodyWho/Qwen_Qwen3.5-4B-GGUF/Qwen_Qwen3.5-4B-Q4_K_M-vendor-sampling.gguf")
response = chat.ask("What is the capital of Denmark?").completed()
print(response)  # The capital of Denmark is Copenhagen.

Vision

python

from nobodywho import Model, Chat, Prompt, Image, Text

model = Model(
    "huggingface:NobodyWho/Qwen_Qwen3.5-4B-GGUF/Qwen_Qwen3.5-4B-Q4_K_M-vendor-sampling.gguf",
    projection_model_path="huggingface:NobodyWho/Qwen_Qwen3.5-4B-GGUF/mmproj-BF16.gguf",
)
chat = Chat(model=model, system_prompt="You are a helpful assistant.")
response = chat.ask(Prompt([
    Text("What is in this image?"),
    Image("./photo.png"),
])).completed()
print(response)

llama-cpp-python

python

from llama_cpp import Llama

llm = Llama.from_pretrained(
    repo_id="NobodyWho/Qwen_Qwen3.5-4B-GGUF",
    filename="Qwen_Qwen3.5-4B-Q4_K_M-vendor-sampling.gguf",
)

Model Specifications

Parameters: 4B
Context length: 262,144 tokens (256K)
License: Apache 2.0
Base model: Qwen/Qwen3.5-4B
Architecture: qwen35 (vision-capable)

Licensing / Credits

Licensed under Apache 2.0 (unchanged from upstream). All model credit belongs to the Qwen team, Alibaba Group. GGUF quantizations provided by unsloth.