LlamaIndex vs Pydantic AI:Which is more popular?
In September 2026, LlamaIndex and Pydantic AI were level in searches among AI agent frameworks worldwide, with an estimated 22.2K branded searches each, at 5.4% of the total each. When we asked ChatGPT and Google AI Overviews about AI agent frameworks, LlamaIndex and Pydantic AI each appeared in three of the five answers. Pydantic AI was mentioned before LlamaIndex in three out of four answers that named either.
Who do people search for more?
LlamaIndex and Pydantic AI are searched for about as often as each other.
Who does AI mention more?
Both were mentioned in 3 of 5 answers.
Who does AI recommend more?
Pydantic AI, named ahead of LlamaIndex in 3 of 4 answers
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Top AI agent frameworks in ChatGPT and Google AI Overviews
In three ChatGPT questions and two 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. Pydantic AI was mentioned in three out of five: in two of the three ChatGPT answers and in one of the two Google AI Overviews. Pydantic AI was listed before LlamaIndex in three out of four answers that named either.
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 LlamaIndex or Pydantic AI more popular in search?
This chart shows how often people search Google for LlamaIndex and Pydantic AI 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 LlamaIndex, Pydantic AI. 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 LlamaIndex and Pydantic AI comparison changed over the last 12 months?
3 findings
- LlamaIndex was ahead of Pydantic AI in every measured month of the 12 months ending September 2026.
- 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.
- Across the 12 months ending September 2026, Pydantic AI’s share of searches among AI agent frameworks worldwide moved from 6.2% to 5.4%, and its estimated monthly branded searches moved from 33.1K 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%.
Estimated monthly branded searches for Pydantic AI worldwide fell 32.9% over 12 measured months, from 33.1K to 22.2K in September 2026.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using LlamaIndex’s and Pydantic AI’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.
LlamaIndex
1 branded search term
- llamaindex
Pydantic AI
1 branded search term
- pydantic ai
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