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onyx vs ART

onyx and ART share 8 technologies: FastAPI, OpenAI, AIOHTTP, NVIDIA, litellm, torch, transformers, and Pydantic. Both are written in Python.

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What they share and what sets them apart

onyx-dot-app

onyx

Open Source AI Platform - AI Chat with advanced features that works with every LLM

Python33.3kRead on November 7, 2026, at commit a757433What is onyx built with?

Only in onyx

In common

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
  • apache-tvm-ffi
  • causal-conv1d
  • flash-attn-4
  • flash-linear-attention
  • flashinfer-python
  • megatron-core
  • ml-dtypes
  • quack-kernels
  • torchtune
  • unsloth-zoo
  • peft
  • msgspec

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
onyx1,626,990 lines written3,906 code files
ART345,462 lines written415 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.
onyx11.7% of its commits signed by AIWith Claude Code, Devin, Cursor, CodeRabbit, GitHub Copilot, and Sweep
ART6.6% of its commits signed by AIWith Claude Code, Cursor, Codex, and Amp
ActivityFrom GitHub and its history, on the day SeeRepo read it.
onyxLast push November 7, 202611,391 commits33,270 stars
ARTLast push November 10, 20261,465 commits10,856 stars
TestsThe files that test the code, and the share of code files a test imports.
onyx3,158 test files45.7% of its code files have a test that imports them
ART391 test files49.2% of its code files have a test that imports them

Frequently asked questions

Which is bigger, onyx or ART?
onyx, with 1,626,990 lines written; ART has 345,462.

The proof: onyx-dot-app/onyx's code at commit a757433

Which has more GitHub stars, onyx or ART?
onyx, with 33,270 stars; ART has 10,856.

The proof: onyx-dot-app/onyx on GitHub

Which has more tests, onyx or ART?
onyx, with 3,158 test files; ART has 391.

The proof: onyx-dot-app/onyx's code at commit a757433

Which was updated more recently, onyx or ART?
ART: its last push was on November 10, 2026, and onyx's on November 7, 2026.

The proof: OpenPipe/ART's commits on GitHub

Which has more commits signed by AI, onyx or ART?
onyx: an AI signed 11.7% of its commits, with Claude Code, Devin, Cursor, CodeRabbit, GitHub Copilot, and Sweep; in ART, 6.6%.

The proof: the commits each tool signed in onyx-dot-app/onyx

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