Source: https://seerepo.com/r/vllm-project/vllm/built
Markdown source: https://seerepo.com/r/vllm-project/vllm/built.md
Description: vllm is a Python repo built with FastAPI and axum. It uses AI through OpenAI. It has 3,163 files and 2,199,772 written lines, with 2,299 test files.

# What is vllm built with?

vllm is a Python repo built with FastAPI and axum. It uses AI through OpenAI. It has 3,163 files and 2,199,772 written lines, with 2,299 test files.

Read on October 27, 2026, at commit 90309f6.

Repository: https://github.com/vllm-project/vllm

## Backend

### The base

- **[FastAPI](https://seerepo.com/uses/fastapi)**: [in package.json](https://github.com/vllm-project/vllm/blob/90309f6b742cdb1d6305778b81063918cf61be81/package.json)
- **axum**: [in package.json](https://github.com/vllm-project/vllm/blob/90309f6b742cdb1d6305778b81063918cf61be81/package.json)

### Services

- **OpenAI**: 29 files · [vllm/entrypoints/cli/openai.py, line 11](https://github.com/vllm-project/vllm/blob/90309f6b742cdb1d6305778b81063918cf61be81/vllm/entrypoints/cli/openai.py#L11)

## Other repos with a similar stack

- [langflow-ai/langflow](https://seerepo.com/r/langflow-ai/langflow/built): FastAPI, OpenAI
- [harry0703/MoneyPrinterTurbo](https://seerepo.com/r/harry0703/MoneyPrinterTurbo/built): FastAPI, OpenAI
- [debpalash/VoiceStudio](https://seerepo.com/r/debpalash/VoiceStudio/built): FastAPI, OpenAI
- [datawhalechina/hello-agents](https://seerepo.com/r/datawhalechina/hello-agents/built): FastAPI, OpenAI
- [abi/screenshot-to-code](https://seerepo.com/r/abi/screenshot-to-code/built): FastAPI, OpenAI
- [open-webui/open-webui](https://seerepo.com/r/open-webui/open-webui/built): FastAPI

## Frequently asked questions

### What language is vllm written in?

vllm is written in Python: 3,163 files and 2,199,772 written lines.

### What framework does vllm use?

vllm is built with FastAPI and axum.

The proof: [in package.json](https://github.com/vllm-project/vllm/blob/90309f6b742cdb1d6305778b81063918cf61be81/package.json)

### Does vllm use AI?

Yes. vllm uses AI through OpenAI.

The proof: [vllm/entrypoints/cli/openai.py, line 11](https://github.com/vllm-project/vllm/blob/90309f6b742cdb1d6305778b81063918cf61be81/vllm/entrypoints/cli/openai.py#L11)

### Does vllm have tests?

Yes. vllm has 2,299 test files.

### Which repos have a stack like vllm's?

The ones that share most of its stack: langflow-ai/langflow, harry0703/MoneyPrinterTurbo, and debpalash/VoiceStudio.

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.