Google Vertex AI Search vs LangChain
Side-by-side from the Top 11 ranking of LangChain vs LlamaIndex vs Haystack: 11 Best RAG Frameworks 2026. Last verified May 31, 2026.
The short answer
LangChain ranks higher on Top 11 (#1 vs #6) for Developers shipping RAG pipelines into production. The most versatile framework with the largest ecosystem for building any type of LLM application, including advanced RAG.
At a glance
| Google Vertex AI Search | LangChain | |
|---|---|---|
| Top 11 rank | #6 / LangChain vs LlamaIndex vs Haystack: 11 Best RAG Frameworks 2026 | #1 / LangChain vs LlamaIndex vs Haystack: 11 Best RAG Frameworks 2026 |
| Score (out of 9.4) | 8.2 | 9.3 |
| Best for | Managed RAG on GCP | Most versatile & integrated |
| Pricing | Usage-Based | Free (Open Source) |
| HQ | Mountain View, USA | San Francisco, USA |
| Founded | 2021 | 2022 |
Google Vertex AI Search
A fully managed, highly scalable RAG-as-a-service for enterprises operating on Google Cloud.
cloud.google.com/vertex-ai-search-and-conversationSee full entry in LangChain vs LlamaIndex vs Haystack: 11 Best RAG Frameworks 2026
LangChain
The most versatile framework with the largest ecosystem for building any type of LLM application, including advanced RAG.
www.langchain.com/See full entry in LangChain vs LlamaIndex vs Haystack: 11 Best RAG Frameworks 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.