Haystack vs LlamaIndex(2026)
Haystack is better for teams that need production-grade reliability. LlamaIndex is the stronger choice if best-in-class for rag. Haystack is open-source (from $0) and LlamaIndex is open-source (from $0).
Full feature breakdown, pricing details, and pros & cons below.
By Bikram Nath
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Haystack
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 HaystackLlamaIndex
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 LlamaIndexHow Do Haystack and LlamaIndex Compare on Features?
| Feature | Haystack | LlamaIndex |
|---|---|---|
| Pricing model | open-source | open-source |
| Starting price | $0 | $0 |
| Modular pipeline architecture | ✓ | — |
| Document stores | ✓ | — |
| Retrieval pipelines | ✓ | — |
| Prompt builder | ✓ | — |
| Evaluation tools | ✓ | — |
| REST API deployment | ✓ | — |
| Enterprise support | ✓ | — |
| RAG pipelines | — | ✓ |
| 100+ data connectors | — | ✓ |
| Multi-modal support | — | ✓ |
| Agents | — | ✓ |
| Query engines | — | ✓ |
| Observability | — | ✓ |
| Python + TypeScript | — | ✓ |
Haystack Pros and Cons vs LlamaIndex
Haystack
LlamaIndex
Should You Use Haystack or LlamaIndex?
For most teams, Haystack is the better default: it offers production-grade reliability and is open-source (from $0). Choose LlamaIndex instead if best-in-class for rag matters more than smaller community than langchain. There is no universal winner — the right pick depends on your budget, team size, and whether you value production-grade reliability or best-in-class for rag more.
Choose Haystack if…
- •Production-grade reliability
- •Modular architecture
- •Strong evaluation tools
Choose LlamaIndex if…
- •Best-in-class for RAG
- •Rich data connectors
- •Strong enterprise adoption