Pick LangChain if
engineers building agents in Python or JS who will read traces when something breaks.
Read the LangChain pageLangChain vs Pydantic AI
Our take
Pick LangChain if engineers building agents in Python or JS who will read traces when something breaks. Pick Pydantic AI if python teams who already trust Pydantic and will add Logfire when they want a trace. Skip LangChain if no-code ops teams (Zapier / Make) or people who only want a visual canvas (Langflow / Dify). Skip Pydantic AI if teams that want a hosted AgentOS UI without writing the agent (Agno).
Best for
LangChain Engineers building agents in Python or JS who will read traces when something breaks
Pydantic AI Write the agent in Python
Free plan
LangChain $0 · langChain / LangGraph: no license fee. You pay model providers
Pydantic AI $0 · 3 projects. 30-day retention. 1 seat + 2 read-only guests. No card
Lowest paid
LangChain LangSmith Plus $39/mo
Pydantic AI Team $49/mo
Next step up
LangChain
Pydantic AI Growth $249/mo
Coding agent
LangChain OSS libraries
Pydantic AI Typed agents
Runs where
LangChain Hosted
Pydantic AI Hosted
Watch out
LangChain OSS is not a studio
Pydantic AI The $0 library is not a $0 model bill
Last checked
LangChain 2026-10-19 · langchain.com/pricing
Pydantic AI 2026-10-22 · pydantic.dev/pricing
Which one, then?
Pick Pydantic AI if
python teams who already trust Pydantic and will add Logfire when they want a trace.
Read the Pydantic AI page