LangChain vs Pydantic AI:Which is more popular?
In September 2026, LangChain had more branded searches than Pydantic AI among AI agent frameworks worldwide. LangChain had about 246,000 branded searches, while Pydantic AI had 22,200. LangChain made up 59.6% of all AI agent framework searches we track, and Pydantic AI accounted for 5.4%. When we asked ChatGPT and Google AI Overviews about AI agent frameworks, LangChain and Pydantic AI each appeared in three of the five answers. Pydantic AI was mentioned before LangChain in three out of four answers that named either.
Who do people search for more?
LangChain, about 11 searches for every 1 for Pydantic AI
Who does AI mention more?
Both were mentioned in 3 of 5 answers.
Who does AI recommend more?
Pydantic AI, named ahead of LangChain 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, LangChain was mentioned in three out of five: in one of the three ChatGPT answers and in both 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 LangChain 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 LangChain or Pydantic AI more popular in search?
This chart shows how often people search Google for LangChain 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 LangChain, 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 LangChain and Pydantic AI comparison changed over the last 12 months?
3 findings
- LangChain was ahead of Pydantic AI 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, 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, LangChain lost share of searches among AI agent frameworks worldwide, from 60.8% to 59.6%.
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 LangChain’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.
LangChain
1 branded search term
- langchain
Pydantic AI
1 branded search term
- pydantic ai
Other head-to-heads among AI agent frameworks
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