OpenAI Agents SDK vs Pydantic AI:Which is more popular?
In September 2026, Pydantic AI had more branded searches than OpenAI Agents SDK among AI agent frameworks worldwide. Pydantic AI had about 22,200 branded searches, while OpenAI Agents SDK had 14,800. Pydantic AI made up 5.4% of all AI agent framework searches we track, and OpenAI Agents SDK accounted for 3.6%. When we asked ChatGPT and Google AI Overviews about AI agent frameworks, OpenAI Agents SDK appeared in all five answers and Pydantic AI in three. OpenAI Agents SDK was mentioned before Pydantic AI in four out of five answers.
Who do people search for more?
Pydantic AI, about 50% more searches than OpenAI Agents SDK
Who does AI mention more?
OpenAI Agents SDK, mentioned in every answer we collected
Who does AI recommend more?
OpenAI Agents SDK, named ahead of Pydantic AI in 4 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, OpenAI Agents SDK appeared in all five answers. 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. OpenAI Agents SDK was listed before Pydantic AI in four 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 OpenAI Agents SDK or Pydantic AI more popular in search?
This chart shows how often people search Google for OpenAI Agents SDK 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 Pydantic AI, OpenAI Agents SDK. 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 OpenAI Agents SDK and Pydantic AI comparison changed over the last 12 months?
3 findings
- Pydantic AI was ahead of OpenAI Agents SDK in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, OpenAI Agents SDK’s share of searches among AI agent frameworks worldwide moved from 5.1% to 3.6%, and its estimated monthly branded searches moved from 27.1K to 14.8K.
- 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
Estimated monthly branded searches for OpenAI Agents SDK worldwide fell 45.4% over 12 measured months, from 27.1K to 14.8K in September 2026.
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 OpenAI Agents SDK’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.
OpenAI Agents SDK
1 branded search term
- openai agents sdk
Pydantic AI
1 branded search term
- pydantic ai
Other head-to-heads among AI agent frameworks
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