ART vs LlamaIndex
ART and LlamaIndex are both agent frameworks. ART is published by OpenPipe and LlamaIndex by LlamaIndex. On GitHub, LlamaIndex has 52,641 stars and ART has 10,819. Both were last active in Oct 2026. The table lines up where they differ (publisher, license and weekly downloads) and has the install commands for both. Everything here comes from the listings' public sources and is refreshed daily. ART describes itself as: Open-source reinforcement learning framework that trains LLM agents on multi-step tasks using GRPO. LlamaIndex: Open-source Python toolkit for RAG and agents over your own data, with event-driven workflows and 300+ integration packages. Licenses: ART Apache-2.0, LlamaIndex MIT.
Updated Oct 26, 2026 · Built from catalog data; how we rank and grade
ART
OpenPipe
Open-source reinforcement learning framework that trains LLM agents on multi-step tasks using GRPO.
LlamaIndex
LlamaIndex
Open-source Python toolkit for RAG and agents over your own data, with event-driven workflows and 300+ integration packages.
Who should pick which
- LlamaIndex has the larger community: 52,641 GitHub stars against 10,819.
From listing data only. We don't pick a winner on security beyond the grades; read how grades work.
Side by side
| Fact | ART | LlamaIndex |
|---|---|---|
| Type | Harness | Harness |
| Publisher | OpenPipe | LlamaIndex |
| License | Apache-2.0 | MIT |
| Pricing | Not stated | Not stated |
| Runs | Not stated | Not stated |
| Auth | Not stated | Not stated |
| Hosts supported | Not stated | Not stated |
| Tools | Not listed yet | Not listed yet |
| Security grade | –Security: not graded yet | –Security: not graded yet |
| Freshness grade | AFreshness: A | AFreshness: A |
| GitHub stars | 10,819 | 52,641 |
| Weekly downloads | 2,536 | 1,391,530 |
| Last release | Oct 20, 2026 | Sep 21, 2026 |
| Last activity | Oct 22, 2026 | Oct 14, 2026 |
Facts from each listing's public sources, checked daily. Tool lists arrive with tool scans.
Install
ART
pip install openpipe-art
LlamaIndex
pip install llama-index
Also consider
- 0.753score
LangChain
LangChain
Python framework of interoperable components and integrations for building agents and LLM apps, with LangGraph and Deep Agents layered above it.
HarnessAFreshness: A★ 148.4K↓ 37.3M/wk - 0.748score
LangGraph
LangChain
Low-level Python orchestration framework for long-running stateful agents, with durable execution, human review points and short- and long-term memory.
HarnessAFreshness: A★ 43.8K↓ 13.1M/wk - 0.732score
CrewAI
CrewAI
Open-source Python framework for multi-agent workflows, with role-based Crews and event-driven Flows.
HarnessAFreshness: A★ 60.1K↓ 644.6K/wk
Questions
- Is ART or LlamaIndex more popular?
- LlamaIndex has more GitHub stars (52,641 against 10,819). Stars measure attention, not quality, so check freshness and docs too.
- Are ART and LlamaIndex open source?
- Yes: ART is Apache-2.0 and LlamaIndex is MIT.
Related
Cite this page
ART vs LlamaIndex. Agent Mart. https://agentmart.dev/compare/art-vs-llamaindex (last updated 2026-10-26)