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Editorial comparison for operators. Ratings are sample data unless verified.
This comparison puts LangChain and LlamaIndex side by side for operators evaluating them in 2026 — pricing model, free access, API availability, and editorial fit. They serve overlapping jobs, so the right pick depends on pricing model, integrations, and how each fits your existing workflow. Treat ratings and pricing as directional and confirm current details on each vendor's site before committing.
| Attribute | LangChain | LlamaIndex |
|---|---|---|
| Type | tool | tool |
| Summary | Open-source LangChain framework for building LLM applications with chains, agents, and memory management. Simplifies integration of language models into production workflows. | Open-source data framework for connecting custom data sources to LLM applications. LlamaIndex simplifies RAG pipeline construction and LLM data indexing. |
| Pricing | free · See vendor site — sample data | free · See vendor site — sample data |
| Free trial | No / not listed | No / not listed |
| API | Yes | Yes |
| Open source | Yes | Yes |
| Editor rating | — | — |
| Categories | AI/ML Development, Developer Tools, Framework & Libraries | AI Infrastructure, Data & Analytics, Developer Tools |
| Key features | Chain abstraction for sequential and conditional LLM operations · Agent framework enabling models to select and execute tools dynamically · Memory management for conversation history and context persistence · RAG support with document loaders, text splitters, and vector store integrations · Multi-provider LLM support (OpenAI, Anthropic, Cohere, local models, and others—verify on vendor site for current list) | 100+ pre-built data connectors for loading from files, databases, APIs, and cloud storage · Flexible document chunking and parsing with support for multiple file formats · Multiple index types including vector, keyword, tree, and SQL indices · Query engines with automatic routing and response synthesis · Agent framework for multi-step reasoning and tool use |
| Actions |
LangChain: Open-source LangChain framework for building LLM applications with chains, agents, and memory management. Simplifies integration of language models into production workflows. Pricing: free (from See vendor site — sample data). LlamaIndex: Open-source data framework for connecting custom data sources to LLM applications. LlamaIndex simplifies RAG pipeline construction and LLM data indexing. Pricing: free (from See vendor site — sample data). Both are covered editorially on OperatorRadar; verify current features on the vendor sites.
LangChain and LlamaIndex list free access (trial or free plan). Check each vendor for current limits.
LangChain is the most budget-friendly entry point — it offers a free plan to start.
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