LangChain vs LlamaIndex:Which is more popular?
In September 2026, LangChain had more branded searches than LlamaIndex among AI agent frameworks worldwide. LangChain had about 246,000 branded searches, while LlamaIndex had 22,200. LangChain made up 59.6% of all AI agent framework searches we track, and LlamaIndex accounted for 5.4%. When we asked ChatGPT and Google AI Overviews about AI agent frameworks, LangChain and LlamaIndex each appeared in three of the five answers. LlamaIndex was mentioned before LangChain in three out of five answers.
Who do people search for more?
LangChain, about 11 searches for every 1 for LlamaIndex
Who does AI mention more?
Both were mentioned in 3 of 5 answers.
Who does AI recommend more?
LlamaIndex, named ahead of LangChain in 3 of 5 answers
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Top AI agent frameworks in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, LangChain was mentioned in three out of five: in one of the three ChatGPT answers and in both Google AI Overviews. LlamaIndex was mentioned in three out of five: in all three ChatGPT answers, but not in either of the two Google AI Overviews. LlamaIndex was listed before LangChain in three out of five answers.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
CrewAI1st- OpenAI Agents SDK2nd
Pydantic AI3rd
AutoGen4th- LangChain5th
- LlamaIndex6th
Semantic Kernel7th
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- CrewAI5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- OpenAI Agents SDK5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- LangChain3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- LlamaIndex3 of 5Named in 3 of 3 ChatGPT answersNamed in 0 of 2 Google answers
- Pydantic AI3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- AutoGen2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
- Semantic Kernel2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
See every answer about AI agent frameworks
5 answers
Asked ChatGPT
“Which AI agent framework should I use?”
Asked ChatGPT
“What are the best AI agent frameworks?”
Asked ChatGPT
“What's the best AI agent framework for building agents?”
Searched Google, AI Overview
“ai agent framework”
Searched Google, AI Overview
“build ai agents”
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is LangChain or LlamaIndex more popular in search?
This chart shows how often people search Google for LangChain and LlamaIndex by name. Each line represents a brand's share of searches for all seven AI agent frameworks we track, month by month, from English-language searches worldwide.
Share of searches by month for LangChain, LlamaIndex. The figures are in the table below the chart.
View monthly share of searches table
| Month | LangChain | CrewAI | AutoGen | LlamaIndex | Pydantic AI | OpenAI Agents SDK | Semantic Kernel |
|---|---|---|---|---|---|---|---|
| Oct 2025 | 56.8% | 11.4% | 9.3% | 7.6% | 6.2% | 5.1% | 3.5% |
| Nov 2025 | 61.1% | 12.3% | 8.2% | 6.7% | 5.5% | 3.7% | 2.5% |
| Dec 2025 | 64.6% | 10.6% | 7.1% | 7.1% | 5.8% | 2.6% | 2.2% |
| Jan 2026 | 59% | 14.5% | 7.9% | 7.9% | 5.3% | 2.9% | 2.4% |
| Feb 2026 | 58% | 17.4% | 7.8% | 6.4% | 5.2% | 2.8% | 2.4% |
| Mar 2026 | 55.1% | 20.2% | 7.4% | 7.4% | 5% | 2.7% | 2.3% |
| Apr 2026 | 52% | 23.3% | 7% | 7% | 4.7% | 3.8% | 2.1% |
| May 2026 | 55.8% | 20.4% | 6.1% | 7.5% | 5% | 3.4% | 1.9% |
| Jun 2026 | 58.9% | 17.7% | 6.5% | 6.5% | 5.3% | 3.5% | 1.6% |
| Jul 2026 | 56.7% | 17.1% | 6.3% | 7.6% | 6.3% | 4.2% | 1.9% |
| Aug 2026 | 60.8% | 15% | 6.7% | 6.7% | 5.5% | 3.7% | 1.7% |
| Sep 2026 | 59.6% | 17.9% | 6.6% | 5.4% | 5.4% | 3.6% | 1.6% |
How has the LangChain and LlamaIndex comparison changed over the last 12 months?
3 findings
- LangChain was ahead of LlamaIndex in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, LangChain’s share of searches among AI agent frameworks worldwide moved from 56.8% to 59.6%, and its estimated monthly branded searches moved from 301K to 246K.
- Across the 12 months ending September 2026, LlamaIndex’s share of searches among AI agent frameworks worldwide moved from 7.6% to 5.4%, and its estimated monthly branded searches moved from 40.5K to 22.2K.
How did search popularity change for AI agent frameworks worldwide in September 2026?
2 changes
In September 2026, LlamaIndex lost share of searches among AI agent frameworks worldwide, from 6.7% to 5.4%.
In September 2026, LangChain lost share of searches among AI agent frameworks worldwide, from 60.8% to 59.6%.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using LangChain’s and LlamaIndex’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
LangChain
1 branded search term
- langchain
LlamaIndex
1 branded search term
- llamaindex
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