Source: https://seerepo.com/compare/microsoft/unilm/vs/vllm-project/vllm
Markdown source: https://seerepo.com/compare/microsoft/unilm/vs/vllm-project/vllm.md
Description: unilm and vllm share 14 technologies: FastAPI, OpenAI, torch, transformers, torchvision, datasets, sentencepiece, torchaudio, tokenizers, einops, triton, tiktoken, peft, and pillow. Both are written in Python.

# unilm vs vllm

unilm and vllm share 14 technologies: FastAPI, OpenAI, torch, transformers, torchvision, datasets, sentencepiece, torchaudio, tokenizers, einops, triton, tiktoken, peft, and pillow. Both are written in Python.

- [microsoft/unilm](https://seerepo.com/r/microsoft/unilm): Large-scale Self-supervised Pre-training Across Tasks, Languages, and Modalities
- [vllm-project/vllm](https://seerepo.com/r/vllm-project/vllm): A high-throughput and memory-efficient inference and serving engine for LLMs

## What they share and what sets them apart

- In common: FastAPI, OpenAI, torch, transformers, torchvision, datasets, sentencepiece, torchaudio, tokenizers, einops, triton, tiktoken, peft, pillow
- Only in unilm: Flask, pyarrow, webdataset, Gradio, scikit-learn, timm, opencv-python, sacrebleu, accelerate, diffusers, deepspeed, bitsandbytes, nltk, vLLM, torchmetrics, pycocotools, lxml, boto3
- Only in vllm: axum, gitdb, pyzmq, Hugging Face, Tokio, starlette, Ray, AIOHTTP, tower, mkdocs-material, indicatif, NVIDIA, quack-kernels, safetensors, MCP, markdown, markupsafe, pymdown-extensions, image, jinja2, Pydantic, msgspec, jsonschema, pydantic-core, opentelemetry-api, python-json-logger, tracing, prometheus-client, psutil, tracing-subscriber, OpenTelemetry, opentelemetry-sdk, prometheus-fastapi-instrumentator

## Side by side

| | unilm | vllm |
|---|---|---|
| Size | 769,203 lines written, 2,555 code files | 2,375,117 lines written, 3,289 code files |
| Who writes it | 0% of its commits signed by AI | 12.8% of its commits signed by AI. With Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code |
| Activity | Last push September 21, 2026, 1,092 commits, 22,240 stars | Last push November 4, 2026, 24,593 commits, 96,302 stars |
| Tests | 163 test files. 5.1% of its code files have a test that imports them | 2,419 test files. 60.2% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, unilm or vllm?

vllm, with 2,375,117 lines written; unilm has 769,203.

The proof: [vllm-project/vllm's code at commit 75f6761](https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

### Which has more GitHub stars, unilm or vllm?

vllm, with 96,302 stars; unilm has 22,240.

The proof: [vllm-project/vllm on GitHub](https://github.com/vllm-project/vllm)

### Which has more tests, unilm or vllm?

vllm, with 2,419 test files; unilm has 163.

The proof: [vllm-project/vllm's code at commit 75f6761](https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

### Which was updated more recently, unilm or vllm?

vllm: its last push was on November 4, 2026, and unilm's on September 21, 2026.

The proof: [vllm-project/vllm's commits on GitHub](https://github.com/vllm-project/vllm/commits)

### Which has more commits signed by AI, unilm or vllm?

vllm: an AI signed 12.8% of its commits, with Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code.

The proof: [the commits each tool signed in vllm-project/vllm](https://seerepo.com/r/vllm-project/vllm/ai)

## Sources

- microsoft/unilm: Read on November 5, 2026, at commit 31c5b90 (https://github.com/microsoft/unilm/tree/31c5b904ca1bf2afb4c234a6675c683a4e5fc7cd)
- vllm-project/vllm: Read on November 4, 2026, at commit 75f6761 (https://github.com/vllm-project/vllm/tree/75f67614971a44050140e3422c1a65fe5004a72b)

## 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.