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What is PydanticAI?
PydanticAI is a Python agent framework designed to simplify building production-grade applications with Generative AI. It provides a structured way to interact with LLMs while leveraging Pydantic's powerful data validation capabilities.How to use PydanticAI?
You can create agents that interact with various LLM providers, define structured outputs, add tools for the LLM to call, and use dependency injection to customize behavior. The framework handles validation, retries, and conversation management.Use Cases
Ideal for building AI assistants, support chatbots, content generation tools, and any application requiring structured interactions with LLMs. Particularly useful when you need type safety and production reliability.Key Features
Model AgnosticSupports OpenAI, Anthropic, Gemini, Deepseek, Ollama, Groq, Cohere, and Mistral with simple interfaces for adding others
Structured ResponsesUses Pydantic models to validate and structure LLM outputs, ensuring consistent responses
Dependency InjectionOptional DI system to provide data/services to system prompts, tools and validators
Streamed ResponsesSupports streaming LLM outputs with immediate validation
Graph SupportPydantic Graph helps manage complex workflows with typing hints
Pros and Cons
Advantages
Built by Pydantic team with strong type safety
Seamless integration with Pydantic Logfire for monitoring
Clean Python-centric design using standard control flow
Excellent for production applications requiring reliability
Limitations
Newer framework with smaller community than some alternatives
Primarily designed for Python ecosystem
Learning curve if unfamiliar with Pydantic
Getting Started
Install PydanticAIInstall the package using pip
Create an AgentDefine an agent with your chosen LLM provider
Add ToolsRegister functions the LLM can call during conversations
Run QueriesInteract with your agent synchronously or asynchronously
Example Use Cases
Bank Support AgentCustomer service chatbot that checks account details
Content GeneratorGenerate marketing copy with consistent formatting
Frequently Asked Questions
1
How does this compare to LangChain?PydanticAI focuses more on type safety and Python-native design, while LangChain offers more pre-built chains and integrations
2
Can I use my existing Pydantic models?Yes! PydanticAI is designed to work seamlessly with your existing Pydantic models for inputs and outputs
3
Is async supported?Yes, all operations support both sync (run_sync) and async (run) execution
Additional Resources
Official DocumentationComplete API reference and usage guides
GitHub RepositorySource code and issue tracker
Pydantic WebsiteLearn more about the Pydantic validation library
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