OpenLLM allows developers to run any open-source LLMs (Llama 3.3, Qwen2.5, Phi3 and more) or custom models as OpenAI-compatible APIs with a single command. It features a built-in chat UI, state-of-the-art inference backends, and a simplified workflow for creating enterprise-grade cloud deployment with Docker, Kubernetes, and BentoCloud.

Understand the design philosophy of OpenLLM.

Get Started

Run the following commands to install OpenLLM and explore it interactively.

pip install openllm  # or pip3 install openllm
openllm hello

Supported models

OpenLLM supports a wide range of state-of-the-art open-source LLMs. You can also add a model repository to run custom models with OpenLLM.

For the full model list, see the OpenLLM models repository.

Start an LLM server

To start an LLM server locally, use the openllm serve command and specify the model version.

[!NOTE] OpenLLM does not store model weights. A Hugging Face token (HF_TOKEN) is required for gated models.

1. Create your Hugging Face token here.
2. Request access to the gated model, such as meta-llama/Llama-3.2-1B-Instruct.
3. Set your token as an environment variable by running:

   export HF_TOKEN=<your token>
   

openllm serve llama3.2:1b

The server will be accessible at http://localhost:3000, providing OpenAI-compatible APIs for interaction. You can call the endpoints with different frameworks and tools that support OpenAI-compatible APIs. Typically, you may need to specify the following:

• The API host address: By default, the LLM is hosted at http://localhost:3000.
• The model name: The name can be different depending on the tool you use.
• The API key: The API key used for client authentication. This is optional.

Here are some examples:

from openai import OpenAI

client = OpenAI(base_url='http://localhost:3000/v1', api_key='na')

# Use the following func to get the available models
# model_list = client.models.list()
# print(model_list)

chat_completion = client.chat.completions.create(
    model="meta-llama/Llama-3.2-1B-Instruct",
    messages=[
        {
            "role": "user",
            "content": "Explain superconductors like I'm five years old"
        }
    ],
    stream=True,
)
for chunk in chat_completion:
    print(chunk.choices[0].delta.content or "", end="")

from llama_index.llms.openai import OpenAI

llm = OpenAI(api_bese="http://localhost:3000/v1", model="meta-llama/Llama-3.2-1B-Instruct", api_key="dummy")
...

Chat UI

OpenLLM provides a chat UI at the /chat endpoint for the launched LLM server at http://localhost:3000/chat.

Chat with a model in the CLI

To start a chat conversation in the CLI, use the openllm run command and specify the model version.

openllm run llama3:8b

Model repository

A model repository in OpenLLM represents a catalog of available LLMs that you can run. OpenLLM provides a default model repository that includes the latest open-source LLMs like Llama 3, Mistral, and Qwen2, hosted at this GitHub repository. To see all available models from the default and any added repository, use:

openllm model list

To ensure your local list of models is synchronized with the latest updates from all connected repositories, run:

openllm repo update

To review a model’s information, run:

openllm model get llama3.2:1b

Add a model to the default model repository

You can contribute to the default model repository by adding new models that others can use. This involves creating and submitting a Bento of the LLM. For more information, check out this example pull request.

Set up a custom repository

You can add your own repository to OpenLLM with custom models. To do so, follow the format in the default OpenLLM model repository with a bentos directory to store custom LLMs. You need to build your Bentos with BentoML and submit them to your model repository.

First, prepare your custom models in a bentos directory following the guidelines provided by BentoML to build Bentos. Check out the default model repository for an example and read the Developer Guide for details.

Then, register your custom model repository with OpenLLM:

openllm repo add <repo-name> <repo-url>

Note: Currently, OpenLLM only supports adding public repositories.

Deploy to BentoCloud

OpenLLM supports LLM cloud deployment via BentoML, the unified model serving framework, and BentoCloud, an AI inference platform for enterprise AI teams. BentoCloud provides fully-managed infrastructure optimized for LLM inference with autoscaling, model orchestration, observability, and many more, allowing you to run any AI model in the cloud.

Sign up for BentoCloud for free and log in. Then, run openllm deploy to deploy a model to BentoCloud:

openllm deploy llama3.2:1b --env HF_TOKEN

[!NOTE] If you are deploying a gated model, make sure to set HF_TOKEN in enviroment variables.

Once the deployment is complete, you can run model inference on the BentoCloud console:

Community

OpenLLM is actively maintained by the BentoML team. Feel free to reach out and join us in our pursuit to make LLMs more accessible and easy to use 👉 Join our Slack community!

Contributing

As an open-source project, we welcome contributions of all kinds, such as new features, bug fixes, and documentation. Here are some of the ways to contribute:

• Repost a bug by creating a GitHub issue.
• Submit a pull request or help review other developers’ pull requests.
• Add an LLM to the OpenLLM default model repository so that other users can run your model. See the pull request template.
• Check out the Developer Guide to learn more.

Acknowledgements

This project uses the following open-source projects:

• bentoml/bentoml for production level model serving
• vllm-project/vllm for production level LLM backend
• blrchen/chatgpt-lite for a fancy Web Chat UI
• astral-sh/uv for blazing fast model requirements installing

We are grateful to the developers and contributors of these projects for their hard work and dedication.