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ART vs vllm

ART and vllm share 11 technologies: FastAPI, OpenAI, AIOHTTP, apache-tvm-ffi, flashinfer-python, NVIDIA, quack-kernels, torch, transformers, Pydantic, and msgspec. Both are written in Python.

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What they share and what sets them apart

OpenPipe

ART

Agent Reinforcement Trainer: train multi-step agents for real-world tasks using GRPO. Give your agents on-the-job training. Reinforcement learning for Qwen3.6, GPT-OSS, Llama, and more!

Python10.9kRead on November 13, 2026, at commit 534620aWhat is ART built with?

Only in ART

  • Anthropic
  • weave
  • causal-conv1d
  • flash-attn-4
  • flash-linear-attention
  • megatron-core
  • ml-dtypes
  • torchtune
  • unsloth-zoo
  • litellm
  • peft

In common

vllm-project

vllm

A high-throughput and memory-efficient inference and serving engine for LLMs

Python96.8kRead on November 12, 2026, at commit c6573eeWhat is vllm built with?

Only in vllm

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
ART345,462 lines written415 code files
vllm2,489,750 lines written3,450 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
ART6.6% of its commits signed by AIWith Claude Code, Cursor, Codex, and Amp
vllm14% of its commits signed by AIWith Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code
ActivityFrom GitHub and its history, on the day SeeRepo read it.
ARTLast push November 10, 20261,465 commits10,856 stars
vllmLast push November 12, 202625,200 commits96,790 stars
TestsThe files that test the code, and the share of code files a test imports.
ART391 test files49.2% of its code files have a test that imports them
vllm2,521 test files61.1% of its code files have a test that imports them

Frequently asked questions

Which is bigger, ART or vllm?
vllm, with 2,489,750 lines written; ART has 345,462.

The proof: vllm-project/vllm's code at commit c6573ee

Which has more GitHub stars, ART or vllm?
vllm, with 96,790 stars; ART has 10,856.

The proof: vllm-project/vllm on GitHub

Which has more tests, ART or vllm?
vllm, with 2,521 test files; ART has 391.

The proof: vllm-project/vllm's code at commit c6573ee

Which was updated more recently, ART or vllm?
vllm: its last push was on November 12, 2026, and ART's on November 10, 2026.

The proof: vllm-project/vllm's commits on GitHub

Which has more commits signed by AI, ART or vllm?
vllm: an AI signed 14% of its commits, with Claude Code, Codex, Gemini CLI, Cursor, GitHub Copilot, Devin, Mistral Vibe, CodeRabbit, Factory, and Qwen Code; in ART, 6.6%.

The proof: the commits each tool signed in vllm-project/vllm

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