vllm/docs/features/quantization/gguf.md

# GGUF

!!! warning
    Please note that GGUF support in vLLM is highly experimental and under-optimized at the moment, it might be incompatible with other features. Currently, you can use GGUF as a way to reduce memory footprint. If you encounter any issues, please report them to the vLLM team.

!!! warning
    Currently, vllm only supports loading single-file GGUF models. If you have a multi-files GGUF model, you can use [gguf-split](https://github.com/ggerganov/llama.cpp/pull/6135) tool to merge them to a single-file model.

To run a GGUF model with vLLM, you can use the `repo_id:quant_type` format to load directly from HuggingFace. For example, to load a Q4_K_M quantized model from [unsloth/Qwen3-0.6B-GGUF](https://huggingface.co/unsloth/Qwen3-0.6B-GGUF):

```bash
# We recommend using the tokenizer from base model to avoid long-time and buggy tokenizer conversion.
vllm serve unsloth/Qwen3-0.6B-GGUF:Q4_K_M --tokenizer Qwen/Qwen3-0.6B
```

You can also add `--tensor-parallel-size 2` to enable tensor parallelism inference with 2 GPUs:

```bash
vllm serve unsloth/Qwen3-0.6B-GGUF:Q4_K_M \
   --tokenizer Qwen/Qwen3-0.6B \
   --tensor-parallel-size 2
```

Alternatively, you can download and use a local GGUF file:

```bash
wget https://huggingface.co/unsloth/Qwen3-0.6B-GGUF/resolve/main/Qwen3-0.6B-Q4_K_M.gguf
vllm serve ./Qwen3-0.6B-Q4_K_M.gguf --tokenizer Qwen/Qwen3-0.6B
```

!!! warning
    We recommend using the tokenizer from base model instead of GGUF model. Because the tokenizer conversion from GGUF is time-consuming and unstable, especially for some models with large vocab size.

GGUF assumes that HuggingFace can convert the metadata to a config file. In case HuggingFace doesn't support your model you can manually create a config and pass it as hf-config-path

```bash
# If your model is not supported by HuggingFace you can manually provide a HuggingFace compatible config path
vllm serve unsloth/Qwen3-0.6B-GGUF:Q4_K_M \
   --tokenizer Qwen/Qwen3-0.6B \
   --hf-config-path Qwen/Qwen3-0.6B
```

You can also use the GGUF model directly through the LLM entrypoint:

??? code

      ```python
      from vllm import LLM, SamplingParams

      # In this script, we demonstrate how to pass input to the chat method:
      conversation = [
         {
            "role": "system",
            "content": "You are a helpful assistant",
         },
         {
            "role": "user",
            "content": "Hello",
         },
         {
            "role": "assistant",
            "content": "Hello! How can I assist you today?",
         },
         {
            "role": "user",
            "content": "Write an essay about the importance of higher education.",
         },
      ]

      # Create a sampling params object.
      sampling_params = SamplingParams(temperature=0.8, top_p=0.95)

      # Create an LLM using repo_id:quant_type format.
      llm = LLM(
         model="unsloth/Qwen3-0.6B-GGUF:Q4_K_M",
         tokenizer="Qwen/Qwen3-0.6B",
      )
      # Generate texts from the prompts. The output is a list of RequestOutput objects
      # that contain the prompt, generated text, and other information.
      outputs = llm.chat(conversation, sampling_params)

      # Print the outputs.
      for output in outputs:
         prompt = output.prompt
         generated_text = output.outputs[0].text
         print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")
      ```