LlamaIndex vs Haystack(2026)
LlamaIndex is better for teams that need best-in-class for rag. Haystack is the stronger choice if production-grade reliability. LlamaIndex is open-source (from $0) and Haystack is open-source (from $0).
Full feature breakdown, pricing details, and pros & cons below.
By Bikram Nath
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LlamaIndex
LlamaIndex is a data framework for LLM applications specializing in connecting LLMs to external data sources — with best-in-class RAG pipelines, data connectors, and indexing strategies.
Starting at $0
Visit LlamaIndexHaystack
Haystack by deepset is an open-source LLM framework for building production-ready search and question-answering pipelines with modular components and enterprise reliability.
Starting at $0
Visit HaystackHow Do LlamaIndex and Haystack Compare on Features?
| Feature | LlamaIndex | Haystack |
|---|---|---|
| Pricing model | open-source | open-source |
| Starting price | $0 | $0 |
| RAG pipelines | ✓ | — |
| 100+ data connectors | ✓ | — |
| Multi-modal support | ✓ | — |
| Agents | ✓ | — |
| Query engines | ✓ | — |
| Observability | ✓ | — |
| Python + TypeScript | ✓ | — |
| Modular pipeline architecture | — | ✓ |
| Document stores | — | ✓ |
| Retrieval pipelines | — | ✓ |
| Prompt builder | — | ✓ |
| Evaluation tools | — | ✓ |
| REST API deployment | — | ✓ |
| Enterprise support | — | ✓ |
LlamaIndex Pros and Cons vs Haystack
LlamaIndex
Haystack
Should You Use LlamaIndex or Haystack?
For most teams, LlamaIndex is the better default: it offers best-in-class for rag and is open-source (from $0). Choose Haystack instead if production-grade reliability matters more than steeper learning curve than langchain. There is no universal winner — the right pick depends on your budget, team size, and whether you value best-in-class for rag or production-grade reliability more.
Choose LlamaIndex if…
- •Best-in-class for RAG
- •Rich data connectors
- •Strong enterprise adoption
Choose Haystack if…
- •Production-grade reliability
- •Modular architecture
- •Strong evaluation tools