vllm-project/vllm

Easy, fast, and cheap LLM serving for everyone

We’re excited to invite you to the first vLLM China Meetup on March 16 in Beijing!

Join us to connect with the vLLM team and explore how vLLM is leveraged in post-training, fine-tuning, and deployment, including verl, LLaMA-Factory, and vllm-ascend.

👉 Register Now to be part of the discussion!

Latest News 🔥

[2025/02] We hosted the ninth vLLM meetup with Meta! Please find the meetup slides from vLLM team here and AMD here. The slides from Meta will not be posted.
[2025/01] We are excited to announce the alpha release of vLLM V1: A major architectural upgrade with 1.7x speedup! Clean code, optimized execution loop, zero-overhead prefix caching, enhanced multimodal support, and more. Please check out our blog post here.
[2025/01] We hosted the eighth vLLM meetup with Google Cloud! Please find the meetup slides from vLLM team here, and Google Cloud team here.
[2024/12] vLLM joins pytorch ecosystem! Easy, Fast, and Cheap LLM Serving for Everyone!
[2024/11] We hosted the seventh vLLM meetup with Snowflake! Please find the meetup slides from vLLM team here, and Snowflake team here.
[2024/10] We have just created a developer slack (slack.vllm.ai) focusing on coordinating contributions and discussing features. Please feel free to join us there!
[2024/10] Ray Summit 2024 held a special track for vLLM! Please find the opening talk slides from the vLLM team here. Learn more from the talks from other vLLM contributors and users!
[2024/09] We hosted the sixth vLLM meetup with NVIDIA! Please find the meetup slides here.
[2024/07] We hosted the fifth vLLM meetup with AWS! Please find the meetup slides here.
[2024/07] In partnership with Meta, vLLM officially supports Llama 3.1 with FP8 quantization and pipeline parallelism! Please check out our blog post here.
[2024/06] We hosted the fourth vLLM meetup with Cloudflare and BentoML! Please find the meetup slides here.
[2024/04] We hosted the third vLLM meetup with Roblox! Please find the meetup slides here.
[2024/01] We hosted the second vLLM meetup with IBM! Please find the meetup slides here.
[2023/10] We hosted the first vLLM meetup with a16z! Please find the meetup slides here.
[2023/08] We would like to express our sincere gratitude to Andreessen Horowitz (a16z) for providing a generous grant to support the open-source development and research of vLLM.
[2023/06] We officially released vLLM! FastChat-vLLM integration has powered LMSYS Vicuna and Chatbot Arena since mid-April. Check out our blog post.

About

vLLM is a fast and easy-to-use library for LLM inference and serving.

Originally developed in the Sky Computing Lab at UC Berkeley, vLLM has evolved into a community-driven project with contributions from both academia and industry.

vLLM is fast with:

State-of-the-art serving throughput
Efficient management of attention key and value memory with PagedAttention
Continuous batching of incoming requests
Fast model execution with CUDA/HIP graph
Quantizations: GPTQ, AWQ, INT4, INT8, and FP8.
Optimized CUDA kernels, including integration with FlashAttention and FlashInfer.
Speculative decoding
Chunked prefill

Performance benchmark: We include a performance benchmark at the end of our blog post. It compares the performance of vLLM against other LLM serving engines (TensorRT-LLM, SGLang and LMDeploy). The implementation is under nightly-benchmarks folder and you can reproduce this benchmark using our one-click runnable script.

vLLM is flexible and easy to use with:

Seamless integration with popular Hugging Face models
High-throughput serving with various decoding algorithms, including parallel sampling, beam search, and more
Tensor parallelism and pipeline parallelism support for distributed inference
Streaming outputs
OpenAI-compatible API server
Support NVIDIA GPUs, AMD CPUs and GPUs, Intel CPUs and GPUs, PowerPC CPUs, TPU, and AWS Neuron.
Prefix caching support
Multi-lora support

vLLM seamlessly supports most popular open-source models on HuggingFace, including:

Transformer-like LLMs (e.g., Llama)
Mixture-of-Expert LLMs (e.g., Mixtral, Deepseek-V2 and V3)
Embedding Models (e.g. E5-Mistral)
Multi-modal LLMs (e.g., LLaVA)

Find the full list of supported models here.

Getting Started

Install vLLM with pip or from source:

pip install vllm

Visit our documentation to learn more.

Contributing

We welcome and value any contributions and collaborations. Please check out CONTRIBUTING.md for how to get involved.

Citation

If you use vLLM for your research, please cite our paper:

@inproceedings{kwon2023efficient,
  title={Efficient Memory Management for Large Language Model Serving with PagedAttention},
  author={Woosuk Kwon and Zhuohan Li and Siyuan Zhuang and Ying Sheng and Lianmin Zheng and Cody Hao Yu and Joseph E. Gonzalez and Hao Zhang and Ion Stoica},
  booktitle={Proceedings of the ACM SIGOPS 29th Symposium on Operating Systems Principles},
  year={2023}
}

Contact Us

For technical questions and feature requests, please use Github issues or discussions.
For discussing with fellow users and coordinating contributions and development, please use Slack.
For security disclosures, please use Github's security advisory feature.
For collaborations and partnerships, please contact us at vllm-questions AT lists.berkeley.edu.

Media Kit

If you wish to use vLLM's logo, please refer to our media kit repo.