Frameworks

LangChain vs LlamaIndex

TL;DR

How LangChain and LlamaIndex compare on real-world demand, licensing, adoption and positioning — straight from the Agent Reality Index.

Agent Reality Index
LangChain #1 in Frameworks · 82.2 / 100 LlamaIndex #3 in Frameworks · 65.9 / 100
Dimension LangChain LlamaIndex
Agent Reality Index 82.2 / 100 (#1) 65.9 / 100 (#3)
Monthly search demand ~111k/mo ~13k/mo
Licensing Open-source Open-source
Developer adoption 185k★ on GitHub 54k★ on GitHub
Positioning Low-level / composable · Single-agent High-level / opinionated · Single-agent

The verdict

LangChain leads LlamaIndex on the Agent Reality Index (82.2 vs 65.9), driven mainly by stronger real-world search demand — the heaviest factor in the index. LlamaIndex remains a credible choice where its positioning fits your workflow better; the row above shows where the two diverge.

Figures auto-generated from the Agent Reality Index and refreshed monthly. How the index is built →

Common questions

Frequently asked questions

What is the difference between LangChain and LlamaIndex?

How LangChain and LlamaIndex compare on real-world demand, licensing, adoption and positioning — straight from the Agent Reality Index.

Is LangChain or LlamaIndex better?

LangChain leads LlamaIndex on the Agent Reality Index (82.2 vs 65.9), driven mainly by stronger real-world search demand — the heaviest factor in the index. LlamaIndex remains a credible choice where its positioning fits your workflow better; the row above shows where the two diverge.

How do LangChain and LlamaIndex compare on the Agent Reality Index?

On the Agent Reality Index, LangChain scores 82.2 of 100 (ranked #1 in Frameworks) and LlamaIndex scores 65.9 of 100 (#3 in Frameworks). The index weights real-world demand most heavily and refreshes monthly.

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